JUNGEKMANNJACEAE. 507 



of saccate bracts, the latter usually in short androecia. Female inflorescence 

 borne on a branch variable in length, with a single subfloral innovation. Peri- 

 anth sharply five-keeled, abruptly narrowed into a short beak. Gemmae dis- 

 coid, borne on the surface of the leaves. [Greek, doubled Lejeunea.] About 

 20 species, tropical. Type species: D. pellucida (Meissn.) Schiffn. 



1. Diplasiolejeunea Rudolphiana Steph. Hedwigia 35: 79. 1896. 



Plants yellowish green, in compact depressed tufts. Leaves imbricated, 

 the dorsal lobe widely spreading, somewhat convex, broadly ovate, about 1.3 

 mm. long, entire or nearly so; lobule about 0.7 mm. long, more or less inflated, 

 the apical tooth long and slender, usually subparallel with the axis; leaf-cells 

 with small trigones; underleaves distant to subimbricated, broadly cuneate, 

 bifid about one half with obliquely spreading, blunt divisions and a rounded 

 sinus; inflorescence autoecious; female inflorescence borne on a branch variable 

 in length, the innovation usually simple and sterile; bracts bifid to the middle 

 or beyond, the dorsal lobe rounded at the apex, the ventral obtuse to - acute; 

 bracteole ovate, shortly bifid, with acute to obtuse divisions; perianth obovate 

 in outline, rounded at the apex; gemmiparous leaves usually two, borne ter- 

 minally on branches with limited growth. 



On bark, New Providence: Florida; West Indies; Dutch Guiana; Brazil. RU- 

 DOLPH'S DIPLASIOLEJEUNEA. 



4. LEPTOCOLEA [Spruce] Evans, Bull. Torr. Club 38: 261. 1911. 



Stems prostrate, minute and delicate, irregularly branched, the branches 

 as in Radula. Leaves more or less imbricated, complicate-bilobed, the dorsal 

 lobes larger than the ventral, broadly to narrowly ovate, attached by a very 

 short base, widely spreading, usually rounded at the apex; lobule inflated, at- 

 tached to the dorsal lobe by a long arched keel, usually with two teeth in the 

 apical region; leaf -cells often with trigones and surface-tubercles, ocelli and 

 hyaline marginal cells sometimes present. Underleaves none. Antheridia borne 

 singly or in pairs in the axils of the male bracts, the latter usually saccate and 

 forming more or less elongated androecia. Archegonia borne singly on more or 

 less elongated branches, with one or two subfloral innovations, the bracts usu- 

 ally with plane lobules. Perianth compressed, with sharp lateral keels and 

 sometimes with a more or less distinct two-angled ventral keel, beak short. 

 Gemmae discoid, borne on the surface of the leaves. [Greek, delicate sheath.] 

 About 30 species, mostly tropical. Type species: L. micrandroecia (Spruce) 

 Evans. 



1. Leptocolea Jooriana (Aust.) Evans, Bull. Torr. Club 38: 270. 1911. 



Lejeunea Jooriana Aust. Bull. Torr. Club 6: 20. 1875. 

 Cololejeunea Jooriana Evans, Mem. Torr. Club 8 : 173. 1902. 



Yellowish green or whitish, loosely tufted or scattered. Leaves imbri- 

 cated, the dorsal lobe widely spreading, plane, ovate, about 0.5 mm. long, grad- 

 ually narrowed to the apex, usually from one to ten hyaline cells with free ex- 

 tremities; lobule about half as long as the lobe, with two teeth in the apical 

 region; leaf -cells with slightly thickened walls and indistinct trigones; inflores- 

 cence paroecious or synoecious; perianth ovate to obovate in outline, truncate 

 to very slightly retuse at the apex with a very short beak. 



On bark, New Providence and Crooked Island : North Carolina to Florida and 

 Louisiana ; Porto Rico. JOOR'S LEPTOCOLEA. 



