NEW OR NOTEWORTHY ORCHIDS 
C. quadricornu is described as having diphyllous pseudo¬ 
bulbs, while C. guatemalensis is said to have monophyllous 
pseudobulbs. However, recent Costa Rican collections, ref¬ 
erable to C. guatemalensis, have pseudobulbs which are 
monophyllous or diphyllous. 
According to descriptions, C. quadricornu has narrower 
leaves than C. guatemalensis. But an examination of the 
type plant of the former species shows it to have irregularly 
folded leaf-blades which thus appear to be narrower than 
they actually are. 
A final discrepancy appears in the sepals and petals of 
the two species, these being ovate or ovate-lanceolate in C. 
quadricornu and lanceolate in C. guatemalensis. But recent 
Costa Rican specimens show an intermediate condition. 
In view, therefore, of the similarity between these 
species, as recorded above, and in view of the variation ex¬ 
hibited by the material in our herbarium, these two plants 
should be regarded as conspecific. 
Centropetalum costaricense A. & S. sp. nov. Herba 
parvula. Caules dense distichophylli, saepissime curvati. 
Folia oblonga, acuta vel leviter apiculata, ad vaginas articu- 
lata, in siccitate saepe curvata et conduplicata, carnosa ut 
videtur. Racemi perbreves, axillares. Sepala similia, ob- 
longo-lanceolata, acuta, conspicue carinata. Petala paulo 
angustiora. Labellum sigmoideum, oblongo-lanceolatum, 
acutum, in medio bicallosum. Gynostemium breve, crassum. 
Plant epiphytic, small and inconspicuous. Roots rel¬ 
atively large and stout, fibrous, flexuous, glabrous. Stems 
commonly curved, up to 12 cm. long, entirely concealed by 
the loose imbricating leaf-sheaths. Leaves densely dis¬ 
tichous, oblong, up to 1.6 cm. long, 4.5 mm. wide, acute or 
shortly apiculate, spreading, articulated, tardily deciduous, 
apparently fleshy in the fresh plant, minutely ciliolate espe¬ 
cially on the apical margins. Racemes very short, axillary, 
about 5 mm. long, apparently 3- or 4-flowered. Floral bracts 
distichous, infundibuliform, approximate, spreading. Sepals 
fleshy, rigid. Lateral sepals oblong-lanceolate or triangular- 
110 
