Pirate XIX. PLevrorHaiits guapRata C. Schweinf. 
1, plant, natural size. 2, flower from front, expanded, 
ten times natural size. 3, column and lip from side, 
ten times natural size. 4, lip from above, expanded, 
ten times natural size. 
PLEUROTHALLIS DILATATA C. Schweinf. 5, plant, one half 
natural size. 6, flower and ovary from side, four times 
natural size. 7, column and lip from side, four times nat- 
ural size. 8, lip from above, expanded, four times nat- 
ural size. 9, petal, four times natural size. 
Pirate XX, PLeurorHaLiis LonaiserPeNs C. Schweinf. 
1, plant, natural size. 2, flower from above, expanded, 
twice natural size. 3, flower and ovary from side, nat- 
ural position, twice natural size. 4, petal, five times 
natural size. 5, lip and column from side, natural posi- 
tion, five times natural size. 6, lip from above, expand- 
ed, five times natural size. 7, column with anterior 
horn from side, five times natural size. 
Prare XXI. PLeuroruatiis rinGENs C. Schweinf. 
1, plant, one half natural size. 2, lip and column from 
side, five times natural size. 3, lip from above, partially 
expanded, five times natural size. 4, dorsal sepal, two 
and one half times natural size. 5, lateral sepals, two 
and one half times natural size. 6, petal, five times 
natural size. 
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