GvuaTEMALA: Road to Mataquescuintla, about 18 miles from Guate- 
mala City, alt. about 6000 ft., February 19, 1935, Margaret Ward 
Lewis 105 (Tyre in Herb. Ames No. 58148). 
Pleurothallis angustisepala Ames & Correll sp. 
nov. 
Herba crassa, epiphytica, erecta vel adscendens, glabra, 
caespitosa. Caulis rigidus, monophyllus, vaginis pluribus 
scariosis inflatis ornatus. Folium oblongo-ellipticum vel 
lanceolatum, breviter acuminatum cum apice minute tri- 
denticulato, sessile, coriaceum. Racemi unici vel plures, 
subsessiles, dense pauciflori, rigidi, basi vagina conduplica- 
ta acuminata inclusi. Florum bracteae infundibuliformes, 
acuto-apiculatae, scariosae. Flores majores, cum pedicel- 
lis brevibus bracteis aequilongis. Sepala omnino granosa., 
Sepalum dorsale anguste lineare, longe acuminatum, tri- 
nervium. Sepala lateralia in laminam elliptico-lanceola- 
tam fere usque ad apicem connata; lamina acute bifida, 
basi conspicue gibbosa, sexnervia, nervo medio utriusque 
dorso carinato. Petala lineari-oblanceolata, acuta vel bre- 
viter acuminata, uninervia, marginibus supra medium ir- 
regulariter longe serratis. Labellum basi valde arcuatum, 
prominenter unguiculatum; unguis subquadratus, incras- 
satus, dente minuto utrinque basi donatus; lamina tri- 
angulari-lanceolata, breviter acuminata, basi auricula 
denticulata prominenti utrinque praedita; discus triner- 
vius, crasse papillosus. Columna generis. 
Plant coarse, epiphytic, erect or ascending, glabrous, 
caespitose, 11-25 cm. tall. Secondary stem rigid, mono- 
phyllous, 2.5-11 em. long, provided with several scarious 
somewhat inflated sheaths. Leaf sessile, oblong-elliptic 
to lanceolate, shortly acuminate and minutely tridenticu- 
late at the apex, coriaceous, dark purple on the lower 
surface, 6-18 cm. long, 1.5-8.5 cm. wide. Racemes one 
to several, essentially sessile, rigid, densely few-flowered, 
up to 4.3 em. long, enclosed at the base by a scarious 
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