Mexico: grass field, La Mesa, Necaxa, Puebla, longitude 98°0/ 
west, latitude 20°11’ north, February 21, 1932, Fréderstrém 2592 
(Type in Herb. Ames No. 51295). 
Variety crenulata is closely allied to var. thelymitra of 
which it is perhaps only a minor variation. The collection 
was made at the northernmost station for the species. 
Corymborchis forcipigera (Reichb.f.) L.O. Wil- 
liams comb, nov. 
Macrostylis forcipigera Reichenbach filius in Bon- 
plandia 2 (1854) 96. 
Corymborchis cubensis Acuna in Bol. Téc. 60, Est. 
Exp. Agron. Santiago de Las Vegas (1989) 51; 
emend. and validated by Correll in Bot. Mus. Leafl. 
Harv. Univ. 8 (1940) 125. 
Although no record of the type of this species is avail- 
able, the original description leaves little doubt as to the 
species intended. The species occurs in Mexico, Guate- 
mala, and Costa Rica, throughout the West Indies and 
in Colombia. 
It is interesting to note that Reichenbach described 
both of the American species of Corymborchis (under 
Macrostylis) in the same year. ‘These names seem to have 
escaped the attention of subsequent systematists. 
Pleurothallis aristocratica L. O. Williams sp. 
nov. 
Herbae parvae, epiphyticae. Folia oblanceolata, ob- 
tusa, coriacea, quam caules secundarii duplo longiora. 
Inflorescentia quam folia brevior. Sepalum dorsale an- 
guste oblongum, obtusum, quinquenervium, subgalea- 
tum, quam sepala lateralia longius, dorso apice apicula- 
tum. Sepala lateralia usque ad super medium connata, 
ovata, recurvata, acuta, apiculata, basi gibbosa. Petala 
obovata vel deltoideo-obovata, obtusa, trinervia, leviter 
obliqua, unguiculata. Labellum unguiculatum, subcor- 
{ 287 } 
