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Issue: Vol. 620 No. 1: 12 Oct. 2023
Type: Article
Published: 2023-10-12
DOI: 10.11646/phytotaxa.620.1.2
Page range: 18-32
Abstract views: 193
PDF downloaded: 13

The mycoheterotrophic genus Didymoplexiella (Orchidaceae) in Cambodia, Laos and Vietnam

Department of Higher Plants; Biological Faculty; M.V. Lomonosov Moscow State University; 1; 12; Leninskie Gory; 119234 Moscow; Russia. Joint Russian-Vietnamese Tropical Scientific and Technological Center; 63 Nguyen Van Huyen street; Cau Giay; 122000 Hanoi; Vietnam.
Komarov Botanical Institute of the Russian Academy of Sciences; 2 Prof. Popov street; 197376 St. Petersburg; Russia.
Institute of Ecology and Biological Resources; Vietnam Academy of Science and Technology; 18 Hoang Quoc Viet Road; Cau Giay; Hanoi; Vietnam. Graduate University of Science and Technology; Vietnam Academy of Science and Technology; 18 Hoang Quoc Viet Road; Cau Giay; Hanoi; Vietnam.
Vietnam National University of Forestry; Xuan Mai; Chuong My; Hanoi; Vietnam.
Mien Trung Institute for Scientific Research; Vietnam National Museum of Nature; Vietnam Academy of Science and Technology; 321 Huynh Thuc Khang street; Thua Thien Hue; Vietnam.
Komarov Botanical Institute of the Russian Academy of Sciences; 2 Prof. Popov street; 197376 St. Petersburg; Russia.
Department of Higher Plants; Biological Faculty; M.V. Lomonosov Moscow State University; 1; 12; Leninskie Gory; 119234 Moscow; Russia. Joint Russian-Vietnamese Tropical Scientific and Technological Center; 63 Nguyen Van Huyen street; Cau Giay; 122000 Hanoi; Vietnam.
Joint Russian-Vietnamese Tropical Scientific and Technological Center; 63 Nguyen Van Huyen street; Cau Giay; 122000 Hanoi; Vietnam. A.N. Severtsov Institute of Ecology and Evolution of the Russian Academy of Sciences; 33 Leninsky avenue; 119071 Moscow; Russia.
Joint Russian-Vietnamese Tropical Scientific and Technological Center; 63 Nguyen Van Huyen street; Cau Giay; 122000 Hanoi; Vietnam.
achlorophyllous plants Eastern Indochina flora new national record orchids plant diversity plant taxonomy Thailand Monocots

Abstract

A synopsis of the orchid genus Didymoplexiella is presented for Cambodia, Laos and Vietnam. Uncertainties in morphological delimitation of the species of Didymoplexiella are addressed in the context of the new data on variation of labellum structure; re-identification of a considerable number of specimens is performed in accordance with the current views. Three species are recognised in the study area. Of them, D. laosensis is endemic to Laos and Vietnam; D. ornata is known from Vietnam and also widely distributed in Malesia; and D. siamensis inhabits all three countries of Eastern Indochina and also Thailand, Japan, China and Taiwan. Didymoplexiella laosensis is newly recorded for Vietnam, whereas D. trichechus is excluded from the known flora of Eastern Indochina, and D. ornata is excluded from the flora of Laos. Typification of D. siamensis is revised. For each species, the type, synonyms (where applicable), citations of relevant regional taxonomic publications, brief taxonomic notes, data on ecology, phenology, distribution and IUCN preliminary assessment are provided. The geographical distribution of the species of Didymoplexiella in Cambodia, Laos and Vietnam is shown on a map. A key for the identification of D. laosensis, D. ornata, D. siamensis and D. trichechus is presented.

 

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