under the supervision of Dr. Schlechter (as well as nu- 
merous collections referred to that species) shows it to 
be inseparable from P. segoviensis Reichb.f. as recorded 
by a drawing of the type in Reichenbach’s herbarium. 
Slight discrepancies from typical P. segoviensis appear in 
the somewhat less faleate petals, in the smooth claw of 
the lip (that of P. segoviensis being described, but not 
indicated, as ‘‘margine papilloso’’) and in the often prom- 
inently pilose inner surface of the sepals. Occasional spec- 
imens referred to P. Werchklei, however, have apparently 
smooth sepals, and this character appears to be of vary- 
ing degree. 
Pleurothallis bifalcis Schitr., also represented in our 
herbarium by an analytical drawing from Dr. Schlechter, 
appears to be only an enlarged form of P.segoviensis. It 
does not present any morphological difference from P. 
segoviensis other than in having a pubescent inner surface 
of the sepals. The raceme appears to be fewer-flowered 
(two to six) and its sepals are said to be 1.4 cm. long, 
whereas the largest sepals seen in the P. Wercklei form 
are scarcely over 9 mm. in length. 
Pleurothallis Wagneri, of which we have a similar 
floral analysis made under the supervision of Dr. Schlech- 
ter, appears to be a vegetatively smaller plant than the 
preceding forms and to possess sepals (about 1.2 em. 
long) longer than those of P. Wercklei, but somewhat 
smaller than those of P. bifalcis. The most striking de- 
parture from the other forms of this polymorphic spe- 
cies appears to lie in the abbreviated petals. However, 
similar petals appear in examples referred to P. Wercklei. 
Pleurothallis falcatiloba is a concept that appears to 
represent the P. Wagneri torm of this alliance. 
The species appears to be very variable in the size of 
the plant, in the length of the leaves, in the size and color 
of the flowers, in the proportion of the petals to the lip 
[97 ] 
