JUXGEEMAXXIACEAE. 513 



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

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

 cells with distinct trigones, averaging about 32 X 18 /i. 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 ftoriferous; perianth obovoid, bluntly five-keeled in 

 the apical region, beak lacking. 



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

 tusely ANGLED TAXILEJEUNEA. 



11. CERATOLEJEUNEA [Spruce] Schiffn. in E. & P. Xat. 

 Pflf. I 8 : 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 axils of saccate bracts, the latter in 

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

 very variable in length, with one or two subfloral 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- 

 vnrta (Spruce) Steph. 



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



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



1. Ceratolejeunea cubensis (Mont.) Schiffn. in E. & P. Nat. Pflf . I 3 : 125. 1894. 



Lejeunea cubensis Mont, in Sagra, Hist. Cub. 9: 481. 1S45. 



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 ft; 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 NicholPs Town, Andros : Florida ; widely distributed in tropical 

 America. Cuban Ceratolejeunea. 



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



Related 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. 



