obovate, posterior portion very fleshy with erect sides, 
anterior portion much thinner and verrucose. Column 
about 2mm. long, slightly arcuate, clinandrium entire or 
denticulate; column-foot long, about 1.2 mm. 
Mexico: on trees in oak forest, region of Teneria, northwest of 
Taxco, State of Guerrero, sepals and petals greenish yellow with dull 
purplish infusion, longitude 99°43! west, latitude 18°36’ north, at 
2300 meters altitude, July 23, 1932, Juan G. [onzdles| 1062 (Tyrr in 
Herb. Ames No. 51792); on trees, near Mexicapa, mountains north- 
west of Cuernavaca, State of Morelos, sepals and petals greenish yel- 
low, lip dull pinkish purple, longitude 99°19/ west, latitude 18°59/ 
north, at 2300 meters altitude, July 8, 1932, Juan G. [onzdles] 2674. 
Pleurothallis Oestlundiana is not closely allied to any 
Central American Pleurothallis. Superficially it some- 
what resembles P. obovata Lindl. 
Scaphyglottis pachyphylla L.O. Williams sp. nov. 
Herbae parvae, repentes. Rhizomata elongata, sim- 
plicia vel ramosa. Pseudobulbi fusiformes vel ovoidei, 
unifoliati, approximati. Folia linearia vel lanceolata, 
acuta vel plusminusve obtusa, carnosissima vel teretia. 
Inflorescentia uniflora. Sepala lanceolata, acuta, quin- 
quenervia. Petala lanceolata, obtusa vel acuta, quinque- 
nervia. Labellum unguiculatum; unguis geniculatus et 
paulo cochleatus; lamina oblonga vel ovalis, callo sub- 
peltato ad unguis et laminae junctionem ornata. 
Small, repent, epiphytic herbs. Rhizome elongated, 
simple or branched, younger portions covered with bracts 
which soon fall away. Pseudobulbs 3-10 mm. long, 2-5 
mm. thick, fusiform to ovoid, unifoliate, approximate, 
about 4-8 mm. apart. Leaves 1.2-8 cm. long, 2-5 mm. 
broad, linear to lanceolate, acute to somewhat obtuse, 
very fleshy or terete. Inflorescence 1-flowered ; peduncle 
sheathed by hyaline bracts which are soon deciduous; 
bract subtending the flower 4-8 mm. long, ovate, acu- 
minate. Flower large for the size of the plant. Sepals 
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