NEW OR NOTEWORTHY ORCHIDS 
claw; lateral lobes about 2 mm. long, falcate, with the sub¬ 
acute tip directed forward, minutely glandular below the 
middle; middle lobe 3.25 mm. long (including the isthmus), 
1.5 mm. wide, orbicular. Disc conspicuously bicarinate, the 
keels arising from a fleshy basal callus which is situated in 
front of the claw. Column 4.5 mm., long, produced into a 
distinct foot, summit irregularly and shortly fringed or 
toothed. 
Pleurothallis Aguilarii is a member of the perplexing 
group to which P. canae Ames, P. vinacea Ames, and P. 
Wagneri Schltr. belong. From P. bifalcis Schltr., it differs 
in the much smaller vegetative structures and in the form of 
the labellum. From P. Wagneri Schltr., it is clearly sepa¬ 
rable by the glandular-hairy sepals. 
Costa Rica, Volcan de Barba, Ramiro Aguilar (No. 
33157 of Paul C. Standley’s Costa Rican plants), February 
3, 1924. (Type in Herb. Ames No. 29146.) 
Pleurothallis archidiaconi Ames sp. nov. Herba 
caespitosa. Caules secundarii elongati, graciles, monophylli. 
Folium coriaceum, ovato-lanceolatum, basi cordato, apice 
breviter bifurcato. Pedunculi fasciculati, folio breviores. 
Sepala lateralia cohaerentia, laminam rotundatam forman- 
tia, valde concava. Sepalum dorsale cucullatum, anguste 
ellipticum. Petala oblonga, deflexa, uninervia, margine plus 
minusve glanduloso. Labellum breviter unguiculatum, ova- 
tum, carnosum, dense glandulosum, leviter unicallosum ante 
unguem. Columna abbreviata. 
Secondary stems elongated, caespitose, 5-17 cm. long, 
paucivaginate, monophyllous. Sheaths tubular, closely op¬ 
pressed, smoothish. Leaf up to 8.5 cm. long, 1.7-2.5 cm. 
'vide, ovate-lanceolate from a cordate base, acuminate, bi¬ 
furcate at the apex. Peduncles fasciculate, about 1 cm. long, 
subtended by a complanate abbreviated spathaceous sheath. 
Lateral sepals completely coherent, forming an orbicular 
lamina which is 4 mm. long and 3 mm. wide, 4-nerved, 
strongly concave. Petals strongly deflexed, 5 mm. long, 
about 1 mm. wide, oblong, acute, glandular on the margin. 
29 
