466 



JUNGERMANNIACEAE. 



1. Euosmolejeunea clausa (Nees & 

 Mont.) Evans. Euosmolejeunea. (Fig. 

 514.) In loose depressed mats. Leaves 

 loosely imbricated, the lobe broadly ovate, 

 about i" long; leaf -cells with large tri- 

 gones; underleaves contiguous or imbri- 

 cated, bifid about one third with obtuse 

 or acute divisions and an obtuse or acute 

 sinus; inflorescence dioecious; androe- 

 cium borne on a short branch, sometimes 

 j)rolif erating ; female inflorescence borne 

 on a short branch, with one subfloral in- 

 novation. [Lejeunea clausa Nees & 

 Mont.] 



On trees and rocks, Paynter's Hill, M. 

 A. Howe. South Carolina to Florida and 

 Alabama ; tropical America. 



13. CE.OSSOTOLEJEUNEA [Spruce] 

 Schiffn. 

 Yellowish or pale green, delicate. 



Stems prostrate, irregularly branched, 

 the branches as in Badula ; rhizoids springing from the bases of the under- 

 leaves. Leaves complicate-bilobed, the dorsal lobes much larger than the 

 ventral, incubous, widely spreading, abruptly expanded from a narrow base, 

 ovate to orbicular, mostly acute or obtuse, crenulate; lobule much as in 

 Lejeunea; leaf -cells thin-walled but with distinct trigones and intermediate 

 thickenings. Underleaves small, ovate to orbicular, deeply bifid with acute 

 lobes, crenulate or dentate. Female inflorescence borne on a short branch or on 

 an elongated branch, with one or two subfloral innovations; bracts and brac- 

 teole similar to the leaves and underleaves. Perianth sharply 5-keeled with the 

 keels more or less crenulate or dentate. [Greek, fringed Lejeunea.'] An 

 American genus of about 2o species, mostly tropical. Type species: C. 

 Boryana (Mont.) Schiffn. 



1. Crossotolejeunea bermudiana 

 Evans. Bermuda Crossotolejeunea. 

 (Fig. 515.) In loose depressed mats. 

 Leaves distant to loosely imbricated, 

 the lobe widely spreading, more or less 

 convex, orbicular, ovate, about i" 

 long, crenulate; leaf -cells with .small 

 but distinct trigones and intermediate 

 thickenings ; ocelli none ; underleaves 

 distant, orbicular, bifid about one half 

 with erect, obtuse, acute or apiculate 

 divisions, and a narrow sinus, crenu- 

 late, sometimes unidentate on each 

 side; inflorescence autoecious; an- 

 droecium occupying a short branch; 

 bracts in two or three pairs, with two 

 antheridia; keels of perianth crenu- 

 late or denticulate. 



^ 



ered 



On the ground and on rocks, Flatts and Paynter's Vale, 

 in Florida, but known from no other localities. 



Recently discov- 



