Dendrobium cumulatum Lindl., Gard. Chron. 1855: 756, 1855

Ormerod, Paul, Kurzweil, Hubert & Watthana, Santi, 2021, Annotated List of Orchidaceae for Myanmar, Phytotaxa 481 (1), pp. 1-262 : 98

Dendrobium cumulatum Lindl., Gard. Chron. 1855: 756, 1855

Homotypic synonym: Callista cumulata (Lindl.) Kuntze, Revis. Gen . Pl. 2: 654, 1891.

Heterotypic synonyms: Dendrobium rhodocentrum Rchb. f., Gard. Chron. 1872: 426, 1872. Callista rhodocentra (Rchb.f.) Kuntze, Revis. Gen . Pl. 2: 655, 1891. Eurycaulis rhodocentrum (Rchb.f.) M.A.Clem., Telopea 10 (1): 287, 2003. Type:—‘INDIA’ (probably Myanmar). Imp. Buller s.n. (holotype: W).

Specimens examined:—? MYANMAR. Type. UPPER MYANMAR. Without collector s.n. (not located, possibly CAL), fide King & Pantling (1898: 46). MON. Mawlamyine District: Benson s.n. (not located), fide Hooker (1868: t. 5703); same loc., Parish 200 ( K, W). TANINTHARYI. Dawei District : Berkeley s.n. ( K); same loc., 640−700 m, Oct 1961, Keenan et al. 1620 ( E). WITHOUT LOCALITY. Cult. material ( W). Reported from Kachin State, Sagaing Region, Chin State and Mandalay Region by Kress et al. (2003: 73), but we have not seen material from these areas .

Distribution:— The eastern Himalayas, northeastern India, Myanmar, Thailand, Indochina and possibly Borneo.

Notes:— We think that D. rhodocentrum cannot be kept separate from D. cumulatum , the former defined merely by a shorter mentum and a more obscure tooth on the lip claw, but also in D. cumulatum from Sikkim, Bhutan and Darjeeling the mentum is short ( Pearce & Cribb 2002: 421). The tooth on the lip claw is also found in both species, although less prominent in specimens originally referred to D. rhodocentrum . A photograph identified as D. linguella Rchb. f. in Nyan Tun (2014: 212) might be referable to this species.

Dendrobium curviflorum Rolfe, Bull. Misc. Inform. Kew 1895: 281, 1895 . Type :—‘INDIAN HILLS’ (? Myanmar). Cult. O’Brien s.n. (holotype: K)

Homotypic synonym: Aporum curviflorum (Rolfe) M.A.Clem. , Telopea 10: 295, 2003.

Specimens examined:—? MYANMAR. Type. KACHIN. Putao District : fide Aung et al. (2020: 77) . MANDALAY. Pyinoolwin District: 1220 m, Maung Sein 13503 ( K); same loc., 1065 m, 15 Aug 1927, Swinhoe BG 2 ( K) .

Distribution:—?Northeastern India, Myanmar and Thailand.

Note:— The type came from the ‘Indian Hills’ but may have originated in Myanmar, which is also indicated in a hand-written note on the type sheet.

Dendrobium cuspidatum Lindl. , Gen . Sp. Orchid. Pl.: 84, 1830. Type:— MYANMAR. Tanintharyi Region: Dawei District , Wallich, Numer. List: no. 2015 (holotype: K)

Homotypic synonym: Callista cuspidata (Lindl.) Kuntze, Revis. Gen . Pl. 2: 654, 1891.

Heterotypic synonyms: Dendrobium sarcanthum Lindl., J. Proc. Linn. Soc., Bot. 3: 20, 1858. Callista sarcantha (Lindl.) Kuntze, Revis. Gen . Pl. 2: 655, 1891. Type:— MYANMAR (falsely ‘Java’). Mon State: Mawlamyine District, Lobb 406 (holotype: K; isotype: BM).

Specimens examined:— YANGON. Central part: 30 m, 26 Aug 1948, Po Khant 696 ( RAF) . MON. Thaton District: fide Clayton (2017: 68); Mawlamyine District : type; same loc., Parish 157 ( K) . TANINTHARYI. Dawei District : type; same loc., 245 m, Aug 1961, Keenan et al. 5309 ( E). WITHOUT LOCALITY. 1926, Swinhoe 64 ( K) .

Distribution:— Myanmar and Thailand.