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ALEXANDER W. EVANS 
inflorescence is usually borne on a leading branch, and the lobules of 
the perichaetial bracts are relatively broader and separated from the 
lobes by deeper sinuses. An even more important difference than 
any of these is found in the autoicous inflorescence of the new species, 
E. duriuscula being invariably dioicous. 
One other species of Euosmolejeunea, the widely distributed E. 
clausa (Nees & Mont.) Evans of tropical and subtropical America, is 
likewise known from Florida. This species agrees with E. duriuscula 
in its dioicous inflorescence but is characterized by its larger under- 
leaves, distinctly rounded or cordate at the base, and by the fact that 
the female inflorescences are borne on more or less abbreviated branches. 
The dioicous inflorescence and the underleaves would at once separate 
E. clausa from E. parvula, although the short female branches might 
suggest 2f relationship. It is further distinguished by its yellowish- 
green color, by its larger size (the leaf-lobes measuring about 0.5 x 0.4 
mm.), and by its firmer texture, the leaf-cells being provided with 
distinct trigones, just as in E. duriuscula. 
Other Florida species with which E. parvula might perhaps be con- 
fused are Cheilolejeunea polyantha Evans and Rectolejeunea phyllohola 
(Nees & Mont.) Evans. In the Cheilolejeunea the inflorescence is 
dioicous, the leaves are densely imbricated, the lobes are orbicular 
and measure about 0.4 mm. in diameter, the underleaves are often 
broader than long and are rounded or cordate at the base, and the 
dorsal surface of the perianth is practically without a keel. All of 
these features would separate it from the new species. The Rectole- 
jeunea agrees with E. parvula in its autoicous inflorescence but is a 
somewhat larger plant when well developed and is further distinguished 
by the proximal position of the hyaline papilla associated with the 
apical tooth of the lobule, by the lack of a dorsal keel on the perianth 
and by slight differences in the form of the underleaves, bracts and 
bracteoles. 
6. Ptychocoleus heterophyllus sp. nov. 
Yellowish or brownish green, scattered or growing in depressed 
mats: stems 1.5-2 mm. in diameter, sparingly pinnate, the branches 
obliquely to widely spreading, usually of the Radula type, rarely of 
the Frullania type, similar to the stem: leaves loosely to closely imbri- 
cated, squarrose when moist, the lobe falcate, ovate, 0.6-0.75 mm. 
long, 0.45-0.6 mm. wide, rounded at the dorsal base, then strongly 
outwardly curved to the rounded or very obtuse apex, margin entire; 
lobule broadly ovate-triangular when explanate, 0.35 mm. long, 
