Oberonia microphylla (Blume) Lindl.

Bunpha, K., Pedersen, H. Ae. & Sridith, K., 2013, Establishing species distributions in large tropical plant genera: insights from twelve new Thai records of Oberonia (Orchidaceae), Blumea 58 (1), pp. 71-76 : 73

6. Oberonia microphylla (Blume) Lindl.

Oberonia microphylla (Blume) Lindl. (1830–1840) 17 [publ.1830]. — Malaxis microphylla Blume (1825 –1826) 395 [publ. 1825]. — Iridorkis microphylla (Blume) Kuntze (1891) 669. — Type: Blume 1896 (holo L), Java, Salak.

Oberonia rosea Hook.f. (1890b) t. 2005, syn. nov. — Type: not designated.

Oberonia kusukusensis Hayata (1914) 26, f. 3i–k, syn. nov. — Type: Hayata & Sasaki s.n. (holo TI n.v.), Taiwan, Kusukusu, June 1912.

Occurrence in Thailand — Peninsular (Nakhon Si Thammarat).

Distribution — Taiwan (e.g. X. Chen et al. 2009), Vietnam (e.g. Seidenfaden 1992), Thailand, Peninsular Malaysia (e.g. Seidenfaden & Wood 1992), Java (e.g. Comber 1990).

Specimens examined. THAILAND, Chantanaorrapint et al. 20 ( PSU), Nakhon Si Thammarat Province, Amphoe Nopphitam, San Yen , Khao Nan National Park , 1100 m alt., 12 March 2009 ; Middleton et al. 4417 ( BK, BKF), Nakhon Si Thammarat Province, Amphoe Ron Phibun, Namtok Yong National Park , Khao Ram Rom , 850 m alt., 9 Sept. 2008 .

Notes — 1. During revision of the Oberonia material in BK, BKF and PSU, two collections of O. microphylla from peninsular Thailand were noted. The older collection (from 2008) had previously been misidentified as O. stenophylla Ridl. , whereas the younger collection (from 2009) had been identified as O. rosea by the collectors.

2. Comparison of O. microphylla (as represented by the protologue, the material from Thailand and the illustrations in Smith 1908 –1914: t. CLXX, Comber 1990: 156) with the younger O. rosea (as represented by the protologue and the drawing provided by Seidenfaden 1968: f. 53), convinced us that the two taxa are conspecific, and we therefore propose O. rosea as a new synonym. We have not examined the type or any other authoritative material of O. kusukusensis , but based on the protologue we believe that X. Chen et al. (2009) were right in considering this taxon conspecific with O. rosea . Consequently, also O. kusukusensis is here proposed as a new synonym of O. microphylla .