186 HEPATICJ^. 



19. Cephalozia leucantha, Spruce. 

 Cephcdozia leucantha, Spruce, On Cephalozia, p. 68 (1882). 



Dioicous, almost always cladocarpous, sometimes acrocarpous, 

 csespitose, eflagelliferous, albescent, small, size of Ceph. divaricafa 

 (Sm.). Stems prostrate, with ^ and ? often intricately entangled, 

 slender, fragile, elongate, flexuose, simple or subramose, radiculose. 

 Leaves small, distant, patulous or assurgent, oblong or quadrate- 

 rotund, bifid to about the middle or more, sinus acute or obtuse, 

 segments often unequal, broadly subulate (3-4 cells broad at the 

 base), acute or subacuminate, parallel or connivent; cells very 

 small, subquadrate, lower ones slightly elongate, walls firm, no 

 trigones or thickened angles. Stipules wanting. Bracts 3 or 4 

 times larger than the lower leaves, more or less connate, orbiculate, 

 subdenticulate, 2-3-lobed, segments short, acuminulate. Perianth 

 large for the size of the plant, 10 times longer than the lower 

 leaves, ovate-lanceolate-fusiform or sublinear, white, leptoderm.ous, 

 above 3- (rarely 4-) augled, composed of a single layer of very 

 small cells, about 100 round near the middle, mouth minute, often 

 obsoletely setulose. Calyptra delicate. Capsule large, often equal 

 to half the size of the perianth, oblong-cylindrical, badious. 

 Androecia short, rarely occupying the whole of the branch, 

 terminal or medial, julaceous; perigonial bracts closely imbricate, 

 orbiculate, very concave, carinate, to a third or more bi-trilobed, 

 monandrous ; bracteole minute, linear-subulate ; antheridia small, 

 oval. 



Fruits Spring and Autumn. 



Dimensions. — Stems |- to J inch long, "075 mm. to "1 mm. in 

 diameter, with leaves "2 mm. wide; leaves '2 mm. x "13 mm., 

 •125 mm. x "15 mm., segments "075 mm., "06 mm., '175 mm. x 

 •175 mm., seg. "075 mm., '15 mm. x -175 mm., seg. '075 mm., 

 •2 mm. X "25 mm., seg. '15 mm., '125 mm., '225 mm. x '2 mm,, 

 seg. '125 mm., 075 mm.; upper leaves '275 mm. x '25 mm., seg. 

 •125 mm., -175 mm.; cells '0167 mm., "015 mm. x '0175 mm., 

 •02 ram. X '02 mm., "015 mm. x "015 mm., '0225 mm. x "02 mm. ; 

 sub-bracts "3 mm. x "25 mm., ses". '15 mm., *4 mm. x '4 mm., ses". 



