144 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 Euosmolejeimea, 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 a 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 phyllobola 

 (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 widel}' 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, 



