complicate-acute, dorsally carinate at the apex. Dorsal 
sepal similar, 8—9.6 mm. long, 2.5—-2.7 mim. broad, obtuse 
or acute. Petals linear-oblanceolate, 8-10 mm. long, 
1.4-1.9 mm. wide above the middle, acute or subacute. 
Lip simple, adnate nearly to the apex of the column, 
spatulate-oblong, 7 mm. or more long, 4—4.7 mm. wide, 
rounded, margin irregular; dise provided at base with an 
ovate paten and above with a broad verrucose band 
through the center and three low crenulate keels on each 
side. Column short, abruptly dilated above, 8-toothed at 
the apex, the lateral teeth more prominent and obliquely 
quadrate, about 4.1 mm. long to the apex of the lateral 
teeth. 
Epidendrum tenuissimum is florally a close ally of 
E. luteoroseum A.Rich. & Gal., but differs from that spe- 
cies in the form of the petals and in the relative length 
of the sepals and petals. The dise of the lip also differs 
in having a broad verrucose band and six crenulate keels, 
whereas 1’. /uteoroseum has five rows of papillae. Vege- 
tatively H.tenuissimum is much smaller than LZ. luteoro- 
seum and its leaves are very different. 
Mexico, State of Michoacan, summit of Barranca de las Minas, 
about 25 kilometers southeast of Uruapan, on oaks. At 1,600 meters 
altitude. May 2, 1933. Erik M. Ostlund 2246 (Collecter O. Nagel) 
(Tver in Herb. Ames No. 39911.) 
[16 ] 
