著者

Kenji Suetsugu Tian-Chuan Hsu

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.74, no.3, pp.177-182, 2023-10-31 (Released:2023-11-04)

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This is the first report of Taeniophyllum complanatum from Yakushima Island, Amami-Oshima Island, and Okinawa Island, Ryukyu Islands, Japan. The species is rare and was previously considered to be endemic to Taiwan. It is distinguishable from T. aphyllum by its strongly flattened roots, minutely papillate inflorescences and the shape of the fully developed fruit.

著者

Kenji Suetsugu Shun K. Hirota Koji Yonekura Atsushi Abe Yoshihisa Suyama Tian-Chuan Hsu

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.74, no.2, pp.121-129, 2023-07-31 (Released:2023-09-08)

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The present study documents the first record of Thrixspermum annamense (Orchidaceae) from Iriomote Island, Ryukyu Islands, Japan, expanding its known distribution beyond Vietnam, Thailand, Taiwan, China, and Malaysia. While the morphologically similar taxon T. fantasticum is present on the island, it can be distinguished from T. fantasticum by its somewhat narrower and more rigid leaves, slightly narrower sepals, densely hairy midlobe of the lip, and the absence of two horn-like appendages at the base of the midlobe. A detailed morphological analysis also revealed that the plants discovered on Iriomote Island closely resemble T. annamense from Taiwan but show consistent morphological and molecular distinctions from T. annamense from Vietnam, the type locality. Despite those differences, the high similarity in gross morphology and most lip structures of the plants from Japan, Taiwan, and Vietnam indicates that they all belong to T. annamense at the species level. Consequently, considering the genetic and morphological differences, we propose resurrecting the name T. devolianum, originally described from Taiwan, and reclassifying it as a variety of T. annamense (T. annamense var. devolianum). A neotype for T. devolianum is also designated.

著者

Kenji Suetsugu

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.73, no.3, pp.211-217, 2022-11-30 (Released:2022-12-15)

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Gastrodia (Orchidaceae) is a species-rich, achlorophyllous genus containing more than 100 species. Recently, several species of Gastrodia with only closed, self-pollinating, cleistogamous flowers were discovered in Japan and Taiwan. Here, an additional taxon of Gastrodia with completely cleistogamous flowers from a lowland evergreen forest on Yakushima, Japan, is described as G. takeshimensis Suetsugu var. shirataniensis Suetsugu. It is most similar to G. takeshimensis var. takeshimensis, but is distinguishable by its peloric labellum and column with a prominent ventral appendage. The assignment of taxonomic rank to a peloric, completely cleistogamous orchid, is discussed. Comparison between G. takeshimensis var. shirataniensis and other taxa of Gastrodia revealed that G. qingyunshanensis is conspecific with G. clausa. The ecological significance of the column appendage in G. takeshimensis var. shirataniensis and G. clausa is also discussed.

著者

Kenji Ogaki Kenji Suetsugu Keiju Kishikawa Daisuke Kyogoku Kohtaroh Shutoh Yuji Isagi Shingo Kaneko

出版者

The Genetics Society of Japan

雑誌

Genes & Genetic Systems (ISSN:13417568)

巻号頁・発行日

vol.94, no.5, pp.225-229, 2019-10-01 (Released:2019-12-10)

参考文献数

27

被引用文献数

1 3

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Gastrodia is the most species-rich genus among mycoheterotrophic plants, and is thus an essential taxon to understand the mechanism of species diversification in mycoheterotrophs. In this study, we developed microsatellite markers with high transferability for four Gastrodia species to examine genetic differentiation and similarity among species, populations and individuals. The 12 microsatellite markers developed from a G. fontinalis library showed high transferability for the ramets that identified G. nipponica, G. kuroshimensis and G. takeshimensis. In addition to the high transferability of these markers, we observed low allele variation within a sampled population of each species and allele differences among the four species. The 12 markers described here will be useful for investigating the genetic differences among and within the Gastrodia species, which evolved by a limitation of gene flow.

著者

Kenji Suetsugu Hirokazu Fukunaga

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.69, no.1, pp.63-67, 2018 (Released:2018-03-02)

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Here we describe a new variety of the mycoheterotrophic genus Lecanorchis, L. triloba J. J. Sm. var. clausa Suetsugu & Fukunaga, discovered during a botanical survey in Okinawa Island, Ryukyu Islands, Japan. The new variety resembles Lecanorchis triloba var. triloba due to its densely flowered rachis and small fruits. However, the new variety differs in that it has complete cleistogamous flowers and a nonrecurved and narrowly triangular midlobe of the lip.

著者

Kenji Suetsugu Takaomi Sugimoto

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.69, no.1, pp.69-74, 2018 (Released:2018-03-02)

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We report three new localities of the mycoheterotrophic plant Sciaphila corniculata (Triuridaceae) from Ishigaki Island, Ryukyu Islands, Japan. Previously, S. corniculata was reported only from Kolombangara Island (Solomon Islands), Waigeo Island (New Guinea) and Obi and Aru islands (the Moluccas). We also update a description of its morphology, in particular on stylar characteristics based on new materials. A key to the Japanese species of Sciaphila based on total flower and stylar characteristics is also provided for easy identification of these rare mycoheterotrophic plants.

著者

Kenji Suetsugu Phetlasy Souladeth Shuichiro Tagane Tetsukazu Yahara

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.69, no.2, pp.139-141, 2018 (Released:2018-06-30)

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A new locality of Lecanorchis taiwaniana from Nam Ha National Protected Area, Luang Namtha Province, northern Laos is reported and a description of the species based on the Laos material is provided. Lecanorchis taiwaniana was known previously only from Japan and Taiwan. Considering that species of Lecanorchis are easily overlooked in the wild due to their short flowering season and dwarf habit, it is possible that L. taiwaniana is more widely distributed.

著者

Kenji Suetsugu Jing-Zhi Lin Tian-Chuan Hsu Hiroshi Hayakawa

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.71, no.2, pp.177-184, 2020-06-30 (Released:2020-07-31)

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Two closely related species, Spiranthes sinensis and S. australis (Orchidaceae), have often been distinguished based on the presence or absence of hairs in their inflorescence and on the stems and ovaries: the stems and ovaries of S. australis are generally pubescent, whereas those of S. sinensis are reported to be glabrous. Although S. australis has not been documented to occur in Taiwan, we found a population of Spiranthes with slightly pubescent stems and ovaries at Tahanshan, southern Taiwan. Because the slightly pubescent plants may represent an undocumented extension of the distribution of S. australis, we attempted to identity the slightly pubescent plants by sequencing the ITS and trnL–F intergenic spacer regions. We also compared the lip and column morphology, which have diagnostic characteristics in Spiranthes, and the molecular and morphological data from S. australis, S. sinensis, their close relative, S. hongkongensis, and the unknown plants. The molecular analysis revealed the slightly pubescent plants to be heterozygous for the ITS sequences from S. australis and S. sinensis or from S. hongkongensis and S. sinensis, whereas the trnL–F intergenic spacer region was identical to that of S. sinensis. While we could not completely exclude the possibility that the unknown plants were hybrids between S. hongkongensis and S. sinensis based on the molecular data, we concluded that they were hybrids between the pubescent S. australis and the glabrous S. sinensis (Taiwan type) based on the lip and column morphology.

著者

Kenji Suetsugu Tian-Chuan Hsu

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.74, no.1, pp.39-45, 2023-02-28 (Released:2023-03-15)

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The taxonomic status of Taeniophyllum aphyllum (Makino) Makino, described from Kochi, Japan, is reevaluated. It has often been treated as a synonym of T. glandulosum Blume from Java, Indonesia, but is distinguishable from T. glandulosum by the pubescence of the inflorescence rachis, the arrangement of the flowers, inflorescence length, and shape of the fully developed fruit. It is therefore proposed that T. aphyllum is recognized as a distinct species. A lectotype for T. aphyllum is also proposed.

著者

Kenji Suetsugu Alberto Bruno Izai Sabino Kikuchi Monica Suleiman Hirokazu Tsukaya

出版者

日本植物分類学会

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.68, no.2, pp.117-121, 2017 (Released:2017-09-12)

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Several new populations of the mycoheterotrophic orchid Kalimantanorchis nagamasui from Sabah, Borneo, Malaysia, are reported. The species was previously considered endemic to West Kalimantan, Borneo, Indonesia. Given that the continued discovery of new species and distributional records of mycoheterotrophic plants have been made from only a limited number of surveys in a small selection of sites, it is likely that further surveys in Borneo will reveal additional occurrences. The description of the morphology, in particular on the underground parts and size variation, of K. nagamasui is also updated.

著者

Kenji Suetsugu Chie Tsutsumi

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.72, no.2, pp.153-160, 2021-06-30 (Released:2021-06-30)

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Liparis koreojaponica Tsutsumi, T. Yukawa, N. S. Lee, C. S. Lee & M. Kato var. kiiensis Suetsugu & Tsutsumi (Orchidaceae) from Nara Prefecture, Japan is described as a new variety. It is similar to L. koreojaponica var. koreojaponica, but differs in spacing of the flowers (ca. 1.5 cm apart in the former vs. ca. 2 cm apart in L. koreojaponica var. koreojaponica), length ratio of rachis/inflorescence (1/3–1/2 vs. 1/4–1/3 in L. koreojaponica var. koreojaponica) and length of the labellum (13–15 mm long vs. 9–12 mm long in L. koreojaponica var. koreojaponica).

著者

Kenji Suetsugu Hiroshi Hayakawa

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.70, no.3, pp.205-208, 2019-10-31 (Released:2019-11-28)

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The discovery of Spiranthes hongkongensis S. Y. Hu & Barretto (Orchidaceae) on Ishigaki Island, Japan, during herbarium studies in KPM is reported. Previously, S. hongkongensis was reported only from China (Guangdong, Hong Kong, Taiwan), and Malaysia (Borneo). Spiranthes hongkongensis is morphologically similar to S. australis, but is distinguishable by the membranous, narrow, truncate rostellum attached to the middle of the pollinia without a viscidium, shorter column and distinctly 3-lobed stigma.

著者

Hiroshi Hayakawa Kenji Suetsugu Shohei Fujimori Takuto Shitara Jun Yokoyama Tomohisa Yukawa

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.71, no.2, pp.163-169, 2020-06-30 (Released:2020-07-31)

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A new peloric form of Cephalanthera erecta (Thunb.) Blume (Orchidaceae) is reported from Hokkaido, Honshu, and Shikoku, Japan. Cephalanthera erecta f. pelorica Hiros. Hayak. & Suetsugu has an inconspicuous lip and stigmas positioned at the apex of the column. The flowers of C. erecta f. pelorica resemble those of the probable peloric form of C. erecta (i.e., C. erecta var. oblanceolata N. Pearce & P. J. Cribb, C. nanlingensis A. Q. Hu & F. W. Xing) and C. longifolia (L.) Fritsch. f. conformis Suetsugu & Hiros. Hayak. However, C. erecta f. pelorica can be distinguished from C. erecta var. oblanceolata, which has a swollen organ on the abaxial surface of the column apex (vs. no swollen organ); C. nanlingensis, which has two staminodes (vs. five staminodes), and C. longifolia f. conformis, which has elliptic, coriaceous leaves (vs. lanceolate, papyraceous leaves).

著者

Kenji Suetsugu Akihiko Kinoshita Kensei Akai

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.70, no.1, pp.41-47, 2019-02-28 (Released:2019-03-09)

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Sciaphila yakushimensis var. okinawensis from Okinawa and Ishigaki Islands, Japan, is described as new. It can be distinguished from S. yakushimensis var. yakushimensis by the morphology of the staminate and carpellate flowers.

著者

Kenji Suetsugu Arief Hidayat Hirokazu Tsukaya

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.69, no.2, pp.135-137, 2018 (Released:2018-06-30)

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The discovery of a new locality of the mycoheterotrophic Gastrodia spathulata (Orchidaceae) in West Java, Indonesia, during herbarium studies in BO is reported. This species was previously considered an endemic species in Mt. Kinabalu, Sabah, Borneo.

著者

KENJI SUETSUGU

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.66, no.3, pp.193-196, 2015-10-31 (Released:2017-03-24)

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Flowering individuals of an unknown species of Gastrodia were discovered on Yakushima Island, Japan. While those plants were somewhat similar to Gastrodia fontinalis, they had shorter inflorescences, a shorter perianth tube and different number of ridges on the labellum, a combination of characteristics remarkably similar to those of G. uraiensis, which was considered to be endemic to Taiwan. Given that there were only minor differences between the original description of G. uraiensis and the plants on Yakushima Island, it was concluded that they were the same species. They represent the first known occurrence of G. uraiensis outside of Taiwan.

著者

Keiju Kishikawa Kenji Suetsugu Daisuke Kyogoku Kenji Ogaki Daisuke Iga Kohtaroh Shutoh Yuji Isagi Shingo Kaneko

出版者

The Genetics Society of Japan

雑誌

Genes & Genetic Systems (ISSN:13417568)

巻号頁・発行日

vol.94, no.2, pp.95-98, 2019-04-01 (Released:2019-04-27)

参考文献数

16

被引用文献数

5 5

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We developed microsatellite markers to compare the genetic variation between the putatively cleistogamous Gastrodia takeshimensis (Orchidaceae) and its chasmogamous sister species G. nipponica. We expected low genetic variation in G. takeshimensis in view of its hypothesized cleistogamy. Eighteen primer pairs were developed from a G. takeshimensis genomic DNA library, and their characteristics were tested for G. takeshimensis and G. nipponica. Seven loci were polymorphic in G. nipponica, whereas all loci showed no polymorphism in G. takeshimensis. Genetic diversity was thus not detected in G. takeshimensis, and it seems to have been lost by repeated selfing in the completely closed flower. The 18 markers described here will be useful for investigating the genetic variation between a cleistogamous species and its chasmogamous sister species.

著者

Kenji Suetsugu Akiyo Naiki Yayoi Takeuchi Hironori Toyama Shuichiro Tagane Tetsukazu Yahara

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.68, no.2, pp.123-126, 2017-06-30 (Released:2017-09-12)

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Two new localities of the mycoheterotrophic plant, Sciaphila alba (Triuridaceae), are reported and the description of its morphology, in particular on color polymorphism of staminate flowers, based on a new collection from Tatau, Sarawak and from herbarium studies at KYO is updated. Sciaphila alba had been reported only from Lambir Hills National Park, Sarawak, Borneo.

著者

Kenji Suetsugu Destario Metusala Yuda Rehata Yudistira

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.72, no.1, pp.67-72, 2021-02-28 (Released:2021-03-21)

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A new locality of Lecanorchis nigricans from West Java, Indonesia, is reported, and a description based on the Javanese material is provided. Since L. nigricans was known previously from Japan, Taiwan, Fujian (China) and Thailand, this discovery represents the southernmost occurrence of the species. Based on the chasmogamous flowers, spatulate sepals and petals, and cucullate lip, these plants should be L. nigricans var. yakushimensis among the three varieties of L. nigricans. Considering that species of Lecanorchis are easily overlooked in the wild due to their short flowering season and dwarf habit, L. nigricans may be more widely distributed in Southeast Asia.

著者

Kenji Suetsugu Hiroshi Hayakawa

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.70, no.1, pp.49-55, 2019-02-28 (Released:2019-03-09)

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A new variety, Goodyera schlechtendaliana Rchb. f. var. yakushimensis Suetsugu & Hiros. Hayak. (Orchidaceae), from Yakushima and Okinawa, is described. It is distinguished from G. schlechtendaliana var. schlechtendaliana by a combination of morphological characters, such as straighter lateral sepals, straighter lip, sparsely hairy inside the concave-saccate hypochile, and slender leaves.