282 Evans: Hepaticae of Puerto Rico 



/ 



appearance because their large trigones are truncate rather than 

 rounded (figure 15). The species is also noteworthy because it 

 fails to develop ocelli and spherical lobules. These characteristics 

 will help to separate it from C. spinosa. It also differs from this 

 species in its entire or sparingly toothed leaves, in its larger 

 underleaves, in its entire or less dentate bracts and bracteoles, 

 and in the differently shaped horns of its perianth. 



Ceratolejeunea brevinervis (Spruce) 



J 



//. 21. f. 6-g. 1894. 



On bark of trees and on rotten logs. North slope of the 

 juillo Mountains, Heller (1131 p.p., 4-712 p. /.). Also known 



Hi 



J 



There is only one important respect in which C, brevinervis 

 differs from C. valida, and that is in the possession of a false nerve 

 running half way from the base to the apex of the lobe and con- 

 sisting of a row of from six to ten ocelli. In some cases there is a 

 second and shorter row lying next to the first. The ocelli average 

 about 40/^ in length and seem to be entirely absent from the 

 bracts. Heller's specimens are not typical, the horns of the peri- 

 anth being shorter than usual, but this is probably because they 

 are poorly developed. 



Ceratolejeunea Schwaneckei Steph. 



25 



Lejeunea cerataiitha Hampe & Gottsche, Linnaea 

 1852. (Not Nees & Mont.) 



6Vra/i?/<f;V//«<?a ^tr/^wa/z^c^^i Steph. Hedwigia 34 : 237. i895- 

 Varying in color from olive -brown to blackish, growing in de- 

 pressed mats: stems 0.14 mm. in diameter, loosely appressed to 

 the substratum, elongated, irregularly pinnate, the branches 

 usually short and widely spreading, often with smaller leaves than 

 the stem: leaves imbricated, the lobe convex and sometimes in- 

 flexed at the apex, falcate- ovate, 0.85 mm. long, 0.6 mm. wide, 

 antical margin neariy straight near base, then strongly curved to 

 the apex, postical margin varying from slightly outwardly curved 

 to slightly incurved, often nearly straight, apex broad, sometimes 

 rounded and entire, sometimes apiculate and sometimes with two 

 to four irregular and scattered teeth, margin otherwise entire ; lobule 



