NEW OR NOTEWORTHY ORCHIDS 
more or less fleshy, 1-nerved. Labellum shortly clawed, 4 
mm. long, 3 mm. wide, resting in the concave depression 
formed by the lateral sepals; lamina very fleshy, ovate from 
a broad base, obtuse, densely glandulose on the outer sur¬ 
face, concave below the middle with an inconspicuous conical 
thickening in front of the claw. Column abbreviated, fleshy, 
about 1 mm. long, apparently entire at the summit. 
Allies of this species are Pleurothallis Cardium Reichb. f., 
which has much larger flowers; P. Smithii Schltr., from which 
it is distinct in its differently proportioned flowers; and P. 
tridentata Klotzsch, which is a smaller plant with different 
perianth segments. In vegetative structure it suggests P. 
pansamalae Schltr. 
Trinidad, B. W. I., Verdant Valley, Archdeacon 
Arthur Hombersley, December 11, 1924. Growing on cacao 
tree. Lip and two (inner) petals red; sepals yellowish green, 
stained chocolate-brown. Leaf stiff. Upper sepal hooded, 
with three brownish purple lines; lower sepals forming a 
rounded lamina. (Type in Herb. Royal Botanic Gardens, 
Trinidad and Tobago No. 10910, and alcoholic specimen from 
the type plant in Herb. Ames No. 29107.) 
Pleurothallis casualis Ames sp. nov. Herba epiphy- 
tica, dense caespitosa. Caules secundarii valde abbreviati, 
vaginati, monophylli. Folium cum petiolo oblanceolatum, 
apice tridentatum, marginatum. Pedunculus cum racemo 
folium aequans. Flores atrosanguinei, perpauci, inter se 
distantes. Sepala lateralia cohaerentia, laminam ellipticam 
sexnerviam formantia. Sepalum dorsale anguste lanceola- 
tum, trinervium. Petala ovato-lanceolata, in caudam 
glandulosam producta. Labellum trilobatum; lobis laterali- 
bus erectis, rotundatis; lobo medio oblongo, obtuso. Discus 
glaber, carinis duabus ornatus. Columna in pedem brevem 
producta, apice quadridentata, dentibus denticulatis. 
Epiphytic, densely caespitose plant up to 2.5 cm. tall. 
Secondary stems much abbreviated, less than 5 mm. long, 
concealed by scarious loosely oppressed tubular sheaths, 
monophyllous. Leaf about 2 cm. long (including the slender 
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