512 



JTJNGEEMANNIACEAE. 



1. Euosmolejeunea duriuscula (Nees) Evans, Mem. Torr. Club 8: 135. 1902. 



Lejeunea duriuscula Nees, in G. L. & N. Syn. Hep. 364. 1845. 



Yellowish green, growing in loose depressed mats. Leaves loosely imbri- 

 cated, the dorsal lobe ovate, about 0.4 mm. long; leaf-cells with distinct tri- 

 gones, averaging about 20/t; underleaves distinct, ovate to orbicular, narrowed 

 tow r ard base, bifid about one half with acute lobes and sinus; inflorescence 

 dioecious; androecium usually intercalary on a more or less elongated branch; 

 female inflorescence borne on a similar branch with one or two subfloral inno- 

 vations. 



On bark, rarely on rocks, Abaco, Andros and New Providence : South Carolina ; 

 Florida ; widely distributed in tropical America. HARSH EUOSMOLEJEUNEA. 



2. Euosmolejeunea clausa (Nees & Mont.) Evans, Bryol. 11: 69. 1908. 



Lejeunea clausa Nees & Mont.; Mont. Ann. Sci. Nat. II. 14: 337. 1840. 



In loose depressed mats. Leaves loosely imbricated, the lobe broadly ovate, 

 about 0.5 mm. long; leaf -cells with large trigones; underleaves contiguous or 

 imbricated, bifid about one third with obtuse or acute divisions and an obtuse 

 or acute sinus; inflorescence dioecious; androecium borne on a short branch, 

 sometimes proliferating; female inflorescence borne on a short branch, with 

 one subfloral innovation. 



On logs, Soldier's Road, New Providence : South Carolina ; Florida and Ala- 

 bama ; Bermuda ; widely distributed in tropical America. CLOSED EUOSMOLEJEUNEA, 



3. Euosmolejeunea trifaria (Keinw. Bl. & Nees) Schiffn. in E. & P. Nat. Pflf. 



I 3 : 124. 1894. 



Jungermannia trifaria Eeinw. Bl. & Nees, Nova Acta 12: 226. 1824. 

 Closely related to the preceding species but characterized by its slightly 

 larger size, more robust trigones and autoecious inflorescence. 



On logs, Soldier's Road and Waterloo, New Providence. Widely distributed in 

 tropical regions throughout the world ; originally described from Javan material. 

 THREEFOLD EUOSMOLEJEUNEA. 



10. TAXILEJEUNEA [Spruce] Schiffn. in E. & P. Nat. 

 Pflf. I 3 : 125. 1894. 



Plants prostrate or sometimes pendulous, bright green to whitish green, 

 medium-sized to greatly elongated, irregularly branched, the branches as in 

 Radula. Leaves complicate-bilobed, the dorsal lobe often involute about the 

 axis, usually acute or apiculate, with the margin more or less crenulate; leaf- 

 cells large, thin-walled but with distinct and often large trigones. Underleaves 

 medium-sized to large, often closely imbricated, bifid, usually crenulate. An- 

 theridia usually borne in pairs in the axils of small saccate bracts, the an- 

 droecia occupying short branches. Archegonia borne singly on branches of 

 variable length, with subfloral innovations, the latter often repeatedly 

 floriferous; bracts smaller than the leaves. Perianth sometimes terete but 

 usually five-kelled in the upper part, the keels smooth or winged. [Greek, 

 swift Lejeunea.} About 100 species, mostly tropical. Type species: T. chim- 

 ~borazensis (Spruce) Steph. 



1. Taxilejeunea obtusangula (Spruce) Evans, Bull. Torr. Club 38: 215. 1911. 



Lejeunea obtusangula Spruce, Trans. Bot. Soc. Edin, 15: 221. 1884. 



Pale green, scattered or forming loose depressed mats. Leaves imbricated, 

 the dorsal lobe obliquely spreading, convex, orbicular-ovate to ovate, about 0.6 



