keel extending to the apical sinus and conspicuously 
broadened and enlarged at the apex. Column clavate, 
large, 9 mm. long. 
This species is allied to Hpidendrum arbuscula Lindl., 
E.. comayaguense Ames and Ff. bisulcatum Ames. It 
differs from EF. arbuscula primarily in its simple instead 
of 8-lobed lip and from FE. bisulcatum chiefly in the ob- 
lanceolate instead of linear petals and the strongly cari- 
nate instead of ecarinate lateral sepals. It differs from 
E. comayaguense primarily in the larger many-flowered 
raceme, strongly carinate lateral sepals and entire, not 
fimbriate, lip. 
GuaTeMaLa: Chimaltenango, quite abundant at an altitude of 8000 
ft. near Calderas on Volcan de Acatenango, May 29, 1939, J. R.John- 
ston 1472 (Tyee in Herb. Ames No. 58193), 
Epidendrum verrucosum Sw. var. myrianthum 
(Lindl.) Ames & Correll comb. nov. 
Epidendrum myrianthum Lindley Fol. Orch. Epid. 
(1853) p. 59. 
Epidendrum myrianthum Lindl. [var.] album ‘*Rehb. 
f.’? ex Williams Orch. Grow. Man. ed. 7 (1894) 887. 
Variety myrianthum is identical in habit with 2. ver- 
rucosum and, except for the color, the flowers are also 
identical in appearance. Instead of being constantly white 
as in the typical form of the species, the color of the flow- 
ers of var. myrianthum varies from almost pure white to 
a deep ruby-red or purplish red. ‘They also have an odor of 
lilacs. The character which best separates these two con- 
cepts is the callus on the lip. The callus of var. myrtan- 
thum is 2-lobed at the apex instead of being 8-lobed as in 
E.. verrucosum. ‘The callus has the appearance of being 
composed of two distinct short linear keels. Variety myri- 
anthum is closely related to E. centropetalum Reichb.f. 
Mexico, Guatemala and Honduras; rare. 
[ 82 ] 
