tations or pits on lower surface of lip. Column short, 
with conspicuous fleshy wings; clinandrium oblique, 
obtuse. Anther terminal, operculate, incumbent, more 
or less globose, 2-celled; cells divided longitudinally. 
Pollinia 4, waxy, each with a granular-viscid appendage. 
Capsule ellipsoidal. 
Caularthron: from the Greek, meaning ‘‘jointed 
stem,’’ undoubtedly in reference to the persistent leaf- 
bases which lend to the elongated pseudobulbs the ap- 
pearance of being jointed. 
A genus occurring from Guatemala through Middle 
America, northern South America and Trinidad and 
Tobago. Two rather variable species are known. 
Key to the species of Caularthron 
A. Labellum 24-28 mm. longum, profunde trilobatum, lobis usuali- 
ter sinu conspicuo separatis; lobo mediano propie lanceolato vel 
elongato-lanceolato; lobis lateralibus ovato-oblongis. Folia ob- 
longa vel oblongo ligulata, 7-25 (plerumque 12-20) em. longa 
<1,5-4.2 (plerumque 3-4) em. lata. 
1. Caularthron bicornutum 
Aa. Labellum 11-14 mm. longum, saepissime inconspicue trilobula- 
tum vel auriculatum vel aliquando subintegrum, lobis usualiter 
non sinu separatis; lobo mediano propie triangulari-ovato; lobis 
lateralibus parvis, vulgo auriformibus. Folia ligulato-lanceolata, 
7-19 (plerumque 14-15) em. longa x 0.8-2.8 (plerumque 1-1.8) 
em. lata. 2. Caularthron bilamellatum 
ORIGINAL DESCRIPTION ! 
138. Caularthron R. (Stem jointed) Diff. Epidendron. Label. libero, 
ad basi alato glanduloso. Col. libera bialata dentata, anthera termi- 
nalis 4 pollen. Caul. articulato, vaginato, bifolio, paucifloro—Habit very 
irregular. Types 2 Sp. 1. Caul. bicornutum. Epid. do Hook. b. m. 
3332. Bulbo cauliformis, fol. rad. ligul. retusis, scapo paucifl. label. 
trilobo, medio lane. ae basi bicorne, petalis ellipt. acutis albis. Trin- 
idad... 
Caularthron bicornutum (Hook.) Rafinesque F. 
Tellur. 2 (1836 [1837] ) 41. 
Hpidendrum bicornutum Hooker in Bot. Mag. (1834) 
t. 833882. 
[ 86 | 
