Prior to the study of Ostlund’s material we recog- 
nized ninety-four valid species of Kpidendrum as compo- 
nents of the Mexican flora. In addition to these ninety- 
four species there were eighteen species (largely those of 
La Llave and Lexarza and of A. Richard and Galeotti) 
which we consider indeterminable and five species which 
were reported as Mexican, or a possible total of one hun- 
dred and seventeen species which might occur in Mexico. 
Of these the Ostlund Herbarium contains sixty-four 
or 58 9—a very remarkable showing. ‘The following paper 
treats the novelties and amplifies the descriptions of three 
species which were previously uncertain owing to their 
rarity and lack of adequate description. 
Epidendrum cyanocolumna 4 mes, Hubbard & 
Schweinfurth, sp. nov. 
Herba pusilla, graminea. Radices pro planta crassae. 
Pseudobulbi graciles, ovoideo-conici, bi- vel trifoliati, Fo- 
lia linearia, acuta. Inflorescentia saepius laxe paniculata. 
Flores rari, membranacei. Sepala lateralia oblonga vel 
oblongo-lanceolata, acuta. Sepalum dorsale oblanceolato 
oblongum, acutum. Petala oblanceolato-linearia. Label- 
lum simplex, columnae basi adnatum, cuneato-spathula- 
tum, leviter retusum, prope basim breviter bilamellatum. 
Columna alis binis erectis oblique triangularibus termi- 
nans. 
Plant small, slender, up to 11 cm. tall. Roots stout 
for the plant, fibrous, flexuous, longitudinally sulcate 
when dry, whitish. Pseudobulbs approximate, 2- to 
8-leaved, ovoid-conic, 5-14 mm. long, 2.5—6 mm. in di- 
ameter, covered by fibrous remains of sheaths. Leaves 
linear, grass-like, 8.7—9.5 em. long, 2-8 mm. wide, acute, 
at base articulated to slender channelled conduplicate 
sheaths which are 5-9 mm. long. Inflorescence subequal- 
ling or slightly exceeding the leaves, sparsely and openly 
[2] 
