NEW OR NOTEWORTHY ORCHIDS 
anthesis. Flower large for the plant. Perianth segments 
connivent in the dried specimen, membranaceous and ner- 
vose in texture. Lateral sepals linear-triangular, strongly 
falcate, about 2.1 cm. long, about 5.2 mm. wide along the 
column-foot, forming a prominent mentum, long acuminate 
with a complicate apex, oblique at base, conspicuously 
7-nerved. Dorsal sepal linear-triangular, about 1.8 cm. 
long, 4 mm. wide near the base, prominently 5-nerved, con¬ 
cave below. Petals very similar to the lateral sepals but 
smaller, 1.7 cm. long, about 2.6 mm. wide near the base. 
Labellum erect and parallel to the column with the sides of 
the basal half incurved in natural position; lamina when ex¬ 
panded elliptic-lanceolate in outline, 14.7 mm. long, 4.9 mm. 
wide near the middle, slightly 3-lobed about 8 mm. from 
the base; middle lobe lanceolate-triangular, 2.8 mm. wide 
at base, long acuminate, mucronate because of a high 
dorsal apical keel. Disc with an obscure median thicken¬ 
ing in the basal half. Column short and stout, 4 mm. long 
at the back, extended into a broad flat foot which is about 
4.7 mm. long. 
Maxillaria attenuata is allied to M. confusa A. & S., but 
it is a much smaller species with a different lip. It has longer 
scapes and much narrower sepals than M. ramonensis 
Schltr. and differs also from that species in having a 
dissimilar lip. It differs from M. brachybulbon Schltr. in 
having conspicuously petioled leaves and dissimilar floral 
segments. 
The description was made from a single herbarium 
specimen. 
The gradually narrowed perianth parts suggest the 
specific name. 
Costa Rica, La Palma, A. M. Brenes 512, December 
19, 1922. 1250 meters altitude. (Type in Herb. Ames No, 
31159.) 
Maxillaria Brenesii Schltr. var. longiloba A. & S. var. 
nov. Haec planta labelli lobo intermedio longo crassissimo 
a specie differ!. 
90 
