The specimen was terrestrial, but the type of root- 
system indicates that it is at least a facultative epiphyte 
and that the terrestrial habit was due to chance. 
Epidendrum (§ Euepidendrum) vesicicaule ZL. O. 
Williams sp. nov. 
Herbae caespitosae, epiphyticae, multo ramosae, usque 
ad 2.5 dm. altae. Folia lineari-lanceolata vel lanceolata, 
acuminata vel acuta, falcata, carnosa; vaginae vesicula- 
tae, plusminusve hyalinae. Inflorescentia uni- vel pauci- 
flora et umbellata. Sepalum dorsale elliptico-lanceolatum, 
obtusum vel acutum, trinervium. Sepala lateralia ovato- 
lanceolata, acuta, trinervia, leviter obliqua. Petala lin- 
earia, uninervia. Labellum columnae valde adnatum; 
lamina late cordata, bicallosa. Columna generis. 
Caespitose, profusely branched, epiphytic herbs up to 
2.5 dm. tall. Stems slender, much branched below, in- 
vested with the bladder-like sheaths of the leaves. Leaves 
3.5-6 cm. long, 4-8 mm. broad, linear-lanceolate to lan- 
ceolate, acuminate or acute, faleate, very fleshy ; sheaths 
somewhat bladder-like and more or less hyaline. Inflo- 
rescence one- to few-flowered, umbellate, subtended by 
a large chartaceous bract. Dorsal sepal about 13 mm. 
long and 8.5 mm. broad, elliptic-lanceolate, obtuse or 
acute, 8-nerved. Lateral sepals about 12 mm. long and 
4.5 mm. broad, ovate-lanceolate, acute, 3-nerved, slightly 
oblique. Petals about 18 mm. long and 1.5 mm. broad, 
linear, l-nerved. Lip strongly adnate to the column; 
lamina about 7.5 mm. long and 8 mm. broad, broadly 
cordate, with two mammillate calli at the base; very 
fleshy above the calli; claw about 6 mm. long, adnate to 
the column. Column about 7 mm. long. Summit of the 
ovary with a vesiculate swelling just below the base of 
the lip. 
[13 ] 
