cealed by four to eleven tubular sheaths which are densely 
hispid on the nerves and terminate in ovate marginate 
hispid mouths. These mouths are spreading and succes- 
sively larger upward. Leaf solitary, round-ovate, round- 
oval or suborbicular, abruptly short-petioled ; lamina 2.5— 
3.7 cm. long, 2—-8.5 cm. wide, broadly obtuse to slightly 
retuse at the broadly rounded apex, subtruncate to broad- 
ly rounded at the base, subcoriaceous, the mid-nerve and 
commonly two other nerves more or less prominent on 
both surfaces. Racemes numerous, abbreviated, about 
2-flowered, the flowers reaching the middle of the erect 
leaf. Flowers membranaceous. Dorsal sepal narrowly 
triangular-lanceolate, about 5.8 mm. long, 1.8 mm. wide 
near the base, acuminate, 8-nerved. Lateral sepals about 
5.1 mm. long, connate for about the basal third; free 
portion narrowly lanceolate, acuminate with recurved 
apex, 8-nerved. Petals much smaller, oblong, somewhat 
broadened at the base on the anterior margin, about 2.1 
mm. long and 1 mm. wide at the base, long-fimbriate 
above, 1-nerved. Lip simple, lanceolate, acuminate, 3 
mim. long, about 1 mm. wide near the middle, 8-nerved, 
minutely auricled at base; the margins of the lower half 
irregular and fimbriate. Column very short with a fim- 
briate clinandrium. 
Pleurothallis rotundata appears to be unique among 
the Central American species of the Lepanthiform sec- 
tion of the genus in having very broad obtuse leaves and 
an acuminate lip. It differs from P. trachytheca Lehm. 
& Kriinzl. in lacking the distinct terminal awn to the 
petals and in the much shorter lip. 
The flower examined was on the summit of a swollen 
ovary and in an advanced stage of anthesis. The specific 
name is in reference to the form of the leaf. 
Panama, Province of Coclé, mountains beyond La Pintada. At 
[ 116 ] 
