This species has been found in Nicaragua and Costa 
Rica where it grows on trees in open forests and pastures 
up to 1050 meters altitude. 
Maxillaria quadrata Ames & Correll nom. nov. 
Ornithidium Lankestert Ames in Sched. Orch. 4 (1928) 
52, non Mawillaria Lankesteri: Ames. 
This species has been found only in Costa Rica where 
it is epiphytic on trees in pastures and on ridges of upper 
slopes up to 1900 meters altitude. 
The specific name is in allusion to the typically quad- 
rate lateral lobes of the lip. The inflorescence is a showy 
mass of pinkish white flowers. 
Maxillaria serrulata 4 mes & Correll nom. nov. 
Camaridium Amparoanum Schlechter in Fedde Re- 
pert. Beihefte 19 (1928) 56, non Maaillaria Amparo- 
ana Schlechter. 
This species has been found only in Costa Rica where 
it is epiphytic on trees. 
The specific name is in allusion to the serrulate-den- 
ticulate mid-lobe of the lip. 
Maxillaria sigmoidea (C. Schweinf.) Ames & Cor- 
rell comb. nov. 
Ornithidium sigmoideum C. Schweinfurth in Bot. Mus. 
Leafl. Harv. Univ. 4 (1987) 121. 
This species has been found only in Costa Rica where 
it is epiphytic on trees in forests up to 2000 meters alti- 
tude. 
Maxillaria purpurea (Spreng.) Ames & Correll 
comb, nov. 
Epidendrum vestitum Swartz Prodr. Veg. Ind. Oce. 
(1788) 124, non Maaillaria vestita Schlechter. 
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