

380 Evans: New West Indian Lejeuneae 



H. 



the trigones of the leaf-cells are more pronounced, and there are 

 no basal ocelli. Even the underleaves, although built up on the 

 same plan as in H. subacuta, are composed of a much larger num- 

 ber of cells, the divisions being often six cells long and five to 

 seven cells wide at the base ; in H. subacuta the divisions are 

 usually only three cells long and four cells wide at the base. 



Odontolejeunea longispica sp. nov. 



Brownish or yellowish green, scattered or growing in loose, 

 depressed mats, more or less mixed with other hepatics : stems 

 o.i mm. in diameter, copiously and irregularly branched, the 

 branches widely spreading, often soon floriferous : leaves contigu- 

 ous or loosely imbricated, the lobe plane or a little convex, rarely 

 narrowly revolute along postical margin, widely spreading, slightly 

 falcate, ovate, maximum size about i.o x 0.7 mm. but often con- 

 siderably smaller, especially on the branches, antical margin 

 scarcely arching across axis, strongly curved from base to apex, 

 postical margin straight or slightly curved, apex broad and rounded, 

 margin sparingly but sharply dentate or spinose except near the 

 base, the teeth irregular, varying from projecting cells to structures 

 five cells long and three cells wide at base, the large teeth more 

 usual on branch-leaves, teeth along postical margin no larger than 

 the others and sometimes obsolete ; lobule subtriangular in outline, 

 about 0.2 mm. long, inflated at base, more or less plane and ap- 

 pressed to lobe in outer part, free margin straight or nearly so 

 (forming one side of the triangle), entire except for the apical tooth, 

 the latter mostly consisting of two superimposed cells arising from 

 a base two or three cells" wide, hyaline papilla usually arising from 

 the inner surface of one of these basal cells, sinus short and 

 straight ; lobule often poorly developed ; cells of lobe plane or 

 nearly so, averaging \ 7 fl at the margin, 32 x 25 // in the middle 

 and 32/ i at the base, trigones minute, triangular, intermediate 

 Thickenings frequent, narrowly elliptical, apparently never conflu- 

 ent : underleaves distant, orbicular, 0.2 mm. long, plane, entire or 

 subcrenulate from projecting cells, attached by a strongly arched 

 line and often narrowly decurrent at base : inflorescence dioicous : 

 ¥ inH °rescence usually borne on a more or less elongated branch, 

 more rarely on a short branch, innovating on one side, the innova- 

 tion short and sterile or soon again floriferous ; bracts obliquely 

 spreading, the lobules represented by minute basal folds, lobe 

 ovate, 07-10 mm. long, 0.4-0.7 mm. wide, spinose-dentate ; 

 oract subtending innovation narrowly winged along keel ; bracte- 



