bearing sheaths and with widely spreading branches in 
the axil of the sheaths below the pseudobulb. The leaf- 
blades vary from about 4 to 21 em. in length and they 
are often as much as 4 em. in width. 
The Colombian Ornithidium dichotomum is surely syn- 
onymous with this species, although it has somewhat 
smaller leaves than the usual form of O. Tafallae and the 
terminal portion of the lip is only obscurely indented on 
each side or subtrilobed, as in the Peruvian specimens. 
The flowers of this form are noted as rosy white, whereas 
those of the Peruvian specimens are described as ‘‘cream’”’ 
or ‘‘cream-green. 
San Martin: Zepelacio, near Moyobamba, at 1200-1600 meters al- 
titude, epiphyte in forest, January 1934, G. Klug 3544; same locality, 
at about 1100 meters altitude, June 1934, Klug 3694. 
Maxillaria tenuis C. Schweinfurth sp. nov. 
Herba epiphytica, tenuis. Pseudobulbi aggregati, in 
sicco cylindracei, complanati, unifoliati. Folium petiola- 
tum; lamina linearis, acuta, basi cuneata, coriacea. Scapi 
basales, perbreves, uniflori, pedunculo vaginis nonnullis 
tubulatis omnino tecto. Flos pro planta grandis. Sepalum 
dorsale lineari-lanceolatum, complicato-acutum, basi con- 
cavum. Sepala lateralia lanceolato-linearia, leviter obli- 
qua, acuta, mentum breve formantia. Petala oblique 
lineari-triangularia, acuminata. Labellum perbreve, la- 
teribus inferioribus erectis, supra medium profunde tri- 
lobatum; lobi laterales perangusti, in apicem liberum 
ovato-rotundatum terminantes; lobus medius triangu- 
lari-ovatus, acuminatus, multo incrassatus. Columna 
parva, in pedem brevem extensa. 
Plant small, slender, epiphytic. Roots fibrous, filiform, 
glabrous, whitish, numerous. Rhizome apparently ab- 
breviated. Pseudobulbs aggregated, cylindric, finely ru- 
gose-striate and often oblique in the dried specimen, 
[ 289 | 
