Rolfe in Gard. Chron. 2, ser. 8 (1887) 44; Pfitzer in 
Engler & Prantl Nat. Pflanzenfam. II, 6 (1888) 146; 
Veitch, Man. Orch. Plant. 6 (1890) 78: L’Orchidoph. 
(1891) 878; Rolfe in Lindenia 7 (1891) 19; Cogniaux 
in Martius Fl. Bras. 8, pt. 5 (1901) 186; Stein, Orch- 
ideenb. (1892) 214; Bois, Les Orch. (1898) 74: Ner- 
chove, Livre des Orch. (1894) 264; Linden, Orch. 
Exot. (1894) 751; Cogniaux in Urban Symb. Antill. 
6 (1910) 588: Schlechter, Die Orchideen (1915) 214: 
Ames ex Standley in Field Mus. Nat. Hist. Publ. 391 
(1937) 210: L. O. Williams in Ann. Mo. Bot. Gard. 
33 (1946) 878; Hoehne, Icon. Orch. Bras. (1949) 208 ; 
P. H. Allen in Orch. Journ. 2 (1953) 185; Ames & 
Correll in Fieldiana: Bot. 26 (1953) 405; Foldats in 
An. Univ. Centr. Venez. 34 (1953) 276. 
Caularthron may be distinguished from Lpidendrum 
on the basis of the characters set forth in the following 
key. 
A. Labellum vulgo ad columnam variabiliter adnatum et cum ea 
parallelum, supra numquam protuberantibus elevatis subtus ex- 
cavatis ornatum, Epidendrum 
Aa. Labellum a columna liberum, a columnae basi angulatim patens, 
supra protuberantibus duabus elevatis subtus excavatis ornatum 
Caularthron 
E\piphytic or semi-epiphytic herbs with fleshy pseudo- 
bulbose, solid or frequently insect-hollowed stems. 
Leaves few, borne at apex of pseudobulbs, rigidly sub- 
‘arnose-coriaceous. Inflorescence terminal, simple, race- 
mose. Flowers few to numerous, showy, short-pedicel- 
late. Sepals free, spreading, subequal. Petals rather 
similar to sepals. Lip free and spreading from base of 
column, 3-lobed; lateral lobes conspicuously tooth-like ; 
mid-lobe triangular or triangular-lanceolate; disk raised 
between lateral lobes into 2 hollow, often horn-like cal- 
luses opening from below to form 2 conspicuous inden- 
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