Didymoplexis Griffith (1844: 383)

Suetsugu, Kenji & Hsu, Tian-Chuan, 2019, New combinations in the genus Didymoplexis (Orchidaceae; Epidendroideae; Gastrodieae), with a new variety of D. siamensis from Amami-Oshima Island, Japan, Phytotaxa 388 (2), pp. 174-178 : 176-177

Didymoplexis Griffith (1844: 383) .

Type species:— Didymoplexis pallens Griffith.

Synonyms: Leucolena Ridley (1891: 340) [not Leucolaena ( de Candolle 1829: 5) Bentham (1837: 55) ]. Type species:— Leucolena ornata Ridley (1891: 340) .

Didymoplexiella Garay (1955: 33, as “ Didimoplexiella ”). Type species:— Didymoplexiella ornata (Ridley) Garay (1955: 33) .

Didymoplexiopsis Seidenfaden (1997: 13) . Type species:— Didymoplexiopsis khiriwongensis Seidenfaden (1997: 13) .

Notes:— Ridley (1891) originally proposed Leucolena based on the presence of long, recurved, apical stelidia on the column. However, Garay (1954) proposed Didymoplexiella because he misunderstood Ridley’s “ Leucolena ” as “ Leucolaena ” and then considered it as a later homonym of Leucolaena ( de Candolle 1829: 5) Bentham (1837: 55) . The epithet Leucolena , composed by Ancient Greek leukos, white, and - olene, arm or elbow, is presumably derived from its characteristic arm-like stelidia, whereas in Leucolaena, Ancient Greek chlaina, cloak, (Latinised to – laena, when combined) is presumably derived from its whitish woolly hairs. Therefore, the two epithets are not orthographic variants. However, despite their distinct etymologies, Leucolena and Leucolaena should still be treated as homonyms as the replaced name of the former, Didymoplexiella , has now been widely accepted, and this practice is to be continued in the interest of nomenclatural stability (see Art. 53.2 of the Shenzhen Code, Turland et al. 2018).

Valid names are already available for the following former Didymoplexiella species:

Didymoplexis borneensis ( Schlechter 1911: 428) Smith (1920: 20) [= Didymoplexiella borneensis (Schlechter) Garay (1954: 33) ]

Didymoplexis forcipata Smith (1927: 18) [= Didymoplexiella forcipata (J.J.Smith) Garay (1954: 33) ] Didymoplexis kinabaluensis Carr (8: 178) [= Didymoplexiella kinabaluensis (Carr) Seidenfaden 1978: 175 ] Didymoplexis ornata (Ridley) Smith (1920: 20) [= Didymoplexiella ornata (J.J.Smith) Garay (1954: 33) ] Didymoplexis trichechus Smith (1920: 19) [= Didymoplexiella trichechus (J.J.Smith) Garay (1954: 34) ].

Didymoplexis cinnabarina (Tsukaya, M.Nakajima & H.Okada) Suetsugu & T.C.Hsu , comb. nov. Basionym: Didymoplexiella cinnabarina Tsukaya, Nakajima & Okada (2005: 208) .

Didymoplexis khiriwongensis (Seidenfaden) Suetsugu & T.C.Hsu , comb. nov. Basionym: Didymoplexiopsis khiriwongensis Seidenfaden (1997: 13) .

Heterotypic synonym: Didymoplexiella hainanensis Jin & Chen (2004: 176) .

Didymoplexis siamensis (Rolfe ex Downie) Suetsugu & T.C.Hsu , comb. nov. Basionym: Leucolena siamensis Rolfe ex Downie (1925: 416) ;

Homotypic synonyms: Didymoplexiella siamensis (Rolfe ex Downie) Seidenfaden (1972: 99) .

Heterotypic synonym: Didymoplexiella denticulata Averyanov (2010: 92) .