JUNGEEMANNIACEAE. 513 



mm. long, apex obtuse or apiculate, margin crenulate; lobule inflated, ovate, 

 involute, the apex tipped with a single, straight, slightly projecting cell; leaf- 

 cells with distinct trigones, averaging about 32 X 18 /u, in the middle of the 

 lobe; underleaves not overlapping, orbicular, plane, bifid one half or less, with 

 erect, usually sharp divisions; inflorescence autoecious; female inflorescence 

 borne on a short or more or less elongated branch, with one or two subfloral 

 innovations, the latter not floriferous; perianth obovoid, bluntly five-keeled in 

 the apical region, beak lacking. 



On rocks, New Providence : — Florida ; Porto Rico ; Virgin Islands ; Brazil. Ob- 

 tusely ANGLED TAXILEJEUMEA. 



11. CERATOLEJEUNEA [Spruce] Schiflen. in E. & P. Nat. 

 Pflf. T: 125. 1894. 



Plants prostrate, medium-sized, more or less pigmented with olive-brown 

 and glossy, irregularly branched, the branches as in Eadula. Leaves compli- 

 cate-bilobed, the dorsal 'lobe convex, often toothed, the apex blunt or acute; 

 lobule normally as in Lejeunea with a hyaline papilla at the proximal base of 

 the apical tooth, sometimes enlarged and bladder-like; leaf-cells with more or 

 less thickened walls and often with apparent trigones; ocelli sometimes pres- 

 ent. Underleaves medium-sized to large, orbicular to reniform, usually -bifid. 

 Antheridia borne singly or in pairs in the a:xils of saccate bracts, the latter in 

 short androecia, often proliferating. Female inflorescence borne on a branch 

 very variable in length, with one or two snabfloral innovations; bracts often 

 smaller and more dentate than the leaves ; bracteole more or less connate. 

 Perianth with a distinct beak and usually with four conspicuous horns. [Greek, 

 horned Lejeunea.'] About 100 species, mostly tropical. Type species: C. plu- 

 mula (Spruce) Steph. 



Leaves more or less dentate : autoecious. 1. C. cubensis. 



Leaves entire or nearly so ; dioecious. 2. C. intcgrifolia. 



1. Ceratolejeunea cubensis (Mont.) Schififn. in E. & P. Nat. Pflf . T: 125. 1S94. 



Lejeunea cubensis Mont, in Sagra, Hist. Cub. 9: 481. 1845. 



Olive green or brown, growing in depressed mats. Leaves imbricated, the 

 dorsal lobe ovate, about 0.4 mm. long, acute and usually irregularly toothed in 

 the apical portion; lobule always small and of the normal Lejeunea type, some- 

 times poorly developed; leaf -cells apparently uniformly thickened, averaging 

 about 15 /u; ocelli usually forming a basal pair; underleaves small, orbicular, 

 plane, bifid about one half with acute divisions; inflorescence autoecious; 

 perianth with short, spreading to suberect horns. 



On logs, Near NichoU's Town, Andros : — Florida ; widely distributed in tropical 

 America. Cuban Ceratolejeunea. 



2. Ceratolejeunea integrifdlia Evans, Bull. Torr. Club 38: 213. 1911. 



Eelated to the preceding species but readily distinguished by its entire 

 leaves and dioecious inflorescence. Bracts and bracteoles of the female in- 

 florescence sometimes very sparingly toothed. 



On bark, New Providence : — Florida ; Cuba ; Porto Rico. Entire-leaved Cera- 

 tolejeunea. 



