TROPICAL AMERICAN ORCHIDS 
mm. long in the middle, about 2.7 mm. wide, broadly 
rounded at the apex, fleshy, margins minutely denticulate- 
erose (most markedly so in the middle of each side), 3-nerved, 
thinner in the centre, with a more or less conspicuous small 
Ungulate concavity at the base. Column very short and 
stout with a minute broad foot adnate to the lateral sepals. 
Pleurothallis angusta appears to be allied to P. Tonduzii 
Schltr., but has smaller flowers with a markedly different 
lip. 
Costa Rica, in cultivation at Las Concavas, probably 
native of Cachi, C. H. Lankester 850. “Leaf Dark Cress 
Green [Ridgway], glabrous, thick.” Pedicels pale green. 
Flower Indian Red [Ridgway] with lip and column the 
same but darker. All sepals green at base without. Dorsal 
sepal centrally sulcate within, “exteriorly 3 keeled.” Lip with 
a “recessed area nearly hyaline, at the base of which a small 
central depression of black purple.” Column short, square; 
rostellum projects as a tongue, dusky rose purple. (Type in 
Herb. Ames No. 28688.) 
Pleurothallis canae Ames Sched. Orch. 2 (1923) 18; 
7 (1924) 26, t. 13. 
Material from Costa Rica differs from the typical plant 
in several features. Vegetatively the stems are much longer 
(some of them 5 cm. long), and the leaves much longer and 
narrower (up to 10.2 cm. long and not more than 1.33 cm. 
wide). Florally the perianth is a little smaller, the petals are 
shorter and broader (2.5 mm. long, up to 1.8 mm. wide), the 
keels on the lip are shallowly bilobed, and the lateral ter¬ 
minations of the wings at the apex of the column are lan¬ 
ceolate or oblong instead of short broad and truncate. 
In view of the wide variation noted in certain members 
of this perplexing group of Pleurothallis, it seems inadvisable 
to segregate the following collection, which consists of a 
single specimen, from P. canae Ames, a Panamanian species. 
Costa Rica, Orosi, C. H. Lankester 929, June 19, 1924. 
(Flowered in cultivation at Cartago.) 4000 feet altitude. 
Flower “deep purple onhyalinebase.” (Herb. Ames No.28687.) 
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