dariis abbreviatis, vaginis tubulosis, atro-brunneis omnino ob- 
tectis, usque ad 5 mm. longis; foliis lineari-oblanceolatis, ob- 
tusis, carnosis; basin versus sensim subpetiolatis, usque ad 5 
cm. longis, 4mm. latis; pedunculo filiformi, unifloro, usque ad 
15 mm. longo; bracteis tubulosis, | mm. longis; floribus 
minutis, flavis vel aurantiacis; sepalis tubulosis, dorsaliter ven- 
tricosis, usque ad 5 mm. longis; lobis liberis oblongo-ellipticis, 
obtusis, usque ad 5 mm. longis, 1.4mm. latis; petalis lineari-ob- 
longis, sub apice paulisper constrictis, apice rotundatis, 
obscure erosis, margine anteriore callo lineari ornata, usque ad 
2 mm. longis, 0.3 mm. latis; labello pandurato, dimidio basilar 
carnoso, subquadrato, concavo, dimidio anteriori e cuneata 
basi subrotondo, margine erosulo, toto labello usque ad 3 mm. 
longo, 1.5 mm. lato; columna abbreviata, usque ad 2 mm. 
longa; ovario cylindrico, usque ad | mm. longo. 
Epiphytic, delicate, caespitose plants, up to 4cm. tall. Roots 
fasciculate, filiform, glabrous. Secondary stem short, com- 
pletely enclosed by imbricating, tubular, brown-purple 
sheaths, up to 5 mm. long. Leaves linear-oblanceolate, obtuse, 
tapering to a petiolate base, up to 5 cm. long and 4 mm. wide. 
Peduncle very short, slender, up to 15 mm. long, one-flowered. 
Bracts tubular, up to | mm. long. Flowers small, yellow to 
orange in color. Sepals united into a dorsally ventricose tube, 
up to 5 mm. long, free parts narrowly oblong-elliptic, obtuse, 
up to 5 mm. long and 1.4 mm. wide. Petals linear-oblong, 
somewhat constricted below the rounded, obscurely erose 
apex, the anterior margin with a short, linear, longitudinal 
thickening, up to 2 mm. long and 0.3 mm. wide. Lip pandurate; 
basal part subquadrate thickened, concave; apical part from a 
cuneate base subrotund with an erose margin, up to 3 mm. long 
and 1.5 mm. wide. Column short, up to 2 mm. long. Ovary 
cylindric, up to | mm. long. 
Venezuela: Sucre, Peninsula de Paria, N.E. of Irapa, 
STEYERMARK 95079! (AMES, VEN). 
Masevallia Lansbergii Rchb.f. in Nederl. Kruidk. Arch. 4: 317, 
1858. 
Syn.: Physosiphon Lansbergii (Rchb.f.) L.O. Wms. in Bot. 
Mus. Leafl. Harv. Univ. 7: 197, 1939. 
43 
