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Acta Phytotaxonomica et Geobotanica Vol. 68(2017) No. 2

The Felt Fern Genus Pyrrosia Mirbel (Polypodiaceae): a New Subgeneric Classification with a Molecular Phylogenic Analysis Based on Three Plastid Markers

Diego Tavares Vasques, Atsushi Ebihara, Motomi Ito

Released: September 12, 2017

p.65-82

Pyrrosia Mirb. (Polypodiaceae) comprises about 59 species, most of which occur in Southeast Asia, but some taxa are also in Africa and Oceania. Although several authors have investigated the species diversity of the genus, a phylogenetic study focusing on the relationship between species has not been available. We used sequences of three plastid markers (rbcL, rps4-trnS and atpB) to reconstruct a phylogenetic tree for 38 taxa of Pyrrosia. Trees were generated under Bayesian inference, ML analysis and MP analysis. Groups present in all analyses were used to propose a subgeneric classification of Pyrrosia. As a result, six subgenera, P. subgenus Lunae Vasques subgenus nov., P. subgenus Neoniphopsis (Nakai) Vasques comb. & stat. nov., P. subgenus Niphobolus (Kaulf.) Vasques comb. nov., P. subgenus Niphopsis (J. Sm.) Shing, P. subgenus Pyrrosia and P. subgenus Solis Vasques subg. nov., are proposed and an identification key, diagnostic traits, notes for identification and an overall discussion of each subgenus are given. The phylogenetic tree represents about 65% of the diversity of the genus. The remaining species are assigned to the proposed subgenera based on their diagnostic traits.

Molecular Phylogenetic Analysis of Japanese Miscanthus (Poaceae)

Hidenori Nakamori, Miki Tomita, Hiroshi Azuma, Takehiro Masuzawa, Toru Tokuoka

Released: September 12, 2017

p.83-92

Miscanthus (Poaceae) comprises about 20 species, of which seven species and two forms occur in Japan. There is controversy whether M. condensatus is a separate species or a variety or subspecies of M. sinensis. To determine its taxonomic status, we conducted a molecular phylogenetic analysis using DNA sequences of the atpB-rbcL, psbC-trnS(UGA), rpl20-rps12, trnL(UAA)-trnF(GAA), trnS(GGA)- trnT(UGU), and nuclear ITS regions, and the Adh1 gene from 31 samples of the seven Japanese species of Miscanthus. The neighbor-joining (NJ) tree based on the cpDNA sequences shows that M. condensatus and M. sinensis share two haplotypes, and that the nuclear ITS and Adh1 sequences of the two species are identical, making it difficult to distinguish M. condensatus from M. sinensis based on DNA sequences. The evidence indicates that hybridization between the two species has proceeded rapidly, or that M. condensatus is derived from a diverging lineage of M. sinensis. The status of M. condensatus remains controversial, but our findings support provisionally treating M. condensatus as the infraspecific taxon, M. sinensis var. condensatus.

Two New Taxa and One New Report of Tarenna (Rubiaceae) for the Flora of Cambodia and Vietnam

Akiyo Naiki, Shuichiro Tagane, Phourin Chhang, Van-Son Dang, Hironori Toyama, Hidetoshi Nagamasu, Tetsukazu Yahara

Released: September 12, 2017

p.93-100

A new species, Tarenna aurantiaca Naiki & Tagane (Rubiaceae) from Hon Ba Nature Reserve, southern Vietnam, and a new variety T. pilosa var. parvifolia Naiki & Tagane from Bokor Nature Reserve, southern Cambodia, are described and illustrated. Tarenna costata (Miq.) Merr. is reported for the first time for the flora of Cambodia. A key to the species of Tarenna in Indochina, including Cambodia, Laos and Vietnam, is provided.

A New Species of Heteroblemma (Melastomataceae) from West Kalimantan, Borneo, Indonesia

Hiroshi Okada, Hirokazu Tsukaya, Akiko Soejima

Released: September 12, 2017

p.101-104

Heteroblemma sibauense H. Okada, Tsukaya & A. Soejima, Melastomataceae, a new species from Sg. (River) Sibau Area, Putussibau, West Kalimantan, Indonesia, is described and illustrated. It is unique in having cauliflorous flowers borne singly in each inflorescence.

A New Variety of the Mycoheterotrophic Orchid Didymoplexis obreniformis (Orchidaceae) from Borneo, Malaysia

Kenji Suetsugu, Monica Suleiman, Hirokazu Tsukaya

Released: September 12, 2017

p.105-109

A new variety, Didymoplexis obreniformis J.J. Sm. var. maliauensis Suetsugu, M. Suleiman & Tsukaya (Orchidaceae), found during a botanical expedition in the Maliau Basin Conservation Area, is described and illustrated. Variety maliauensis resembles var. obreniformis, which is known only from Java, Indonesia, in having a remarkably retuse lip but differs in having a distinct central ridge on the sepals and petals, smaller and narrower lip, narrower lateral petals, and narrower dorsal and lateral sepals.

Potamogeton ×tosaensis (Potamogetonaceae), A New Hybrid from Kochi Prefecture (Shikoku, Japan)

Kaori Horii, Takashi Yamanouchi, Yasuro Kadono

Released: September 12, 2017

p.111-116

Potamogeton ×tosaensis Kadono, Horii & Yamanouchi (Potamogetonaceae) is described here as a new hybrid. Although similar to P. octandrus, it is morphologically distinguishable in several traits. Most conspicuous of these are the connate stipules and fusiform turion bearing one acerose leaf. The plants were found only in and around Kochi City, Shikoku. Potamogeton octandrus and P. pusillus are the putative parents.

New Distributional Records for the Mycoheterotrophic Orchid Kalimantanorchis nagamasui from Sabah, Borneo, Malaysia

Kenji Suetsugu, Alberto Bruno Izai Sabino Kikuchi, Monica Suleiman, Hirokazu Tsukaya

Released: September 12, 2017

p.117-121

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.

New Distributional Records of the Mycoheterotrophic Sciaphila alba (Triuridaceae), outside the Type Locality

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

Released: September 12, 2017

p.123-126

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.

Index to new names and combinations appearing in Acta Phytotaxonomica et Geobotanica 68(2)

Released: September 12, 2017

p.127

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Back Issues

Volume And Issue List
Acta Phytotaxonomica et Geobotanica

Acta Phytotaxonomica et Geobotanica Vol. 68(2017) No. 2

The Felt Fern Genus Pyrrosia Mirbel (Polypodiaceae): a New Subgeneric Classification with a Molecular Phylogenic Analysis Based on Three Plastid Markers

Molecular Phylogenetic Analysis of Japanese Miscanthus (Poaceae)

Two New Taxa and One New Report of Tarenna (Rubiaceae) for the Flora of Cambodia and Vietnam

A New Species of Heteroblemma (Melastomataceae) from West Kalimantan, Borneo, Indonesia

A New Variety of the Mycoheterotrophic Orchid Didymoplexis obreniformis (Orchidaceae) from Borneo, Malaysia

Potamogeton ×tosaensis (Potamogetonaceae), A New Hybrid from Kochi Prefecture (Shikoku, Japan)

New Distributional Records for the Mycoheterotrophic Orchid Kalimantanorchis nagamasui from Sabah, Borneo, Malaysia

New Distributional Records of the Mycoheterotrophic Sciaphila alba (Triuridaceae), outside the Type Locality

Index to new names and combinations appearing in Acta Phytotaxonomica et Geobotanica 68(2)

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Announcement From J-STAGE

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Acta Phytotaxonomica et Geobotanica Vol. 68(2017) No. 2

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