158 • EVANS 



remaining short and simple, others becoming themselves pinnate 

 in the same way as the stem ; stem-leaves contiguous to loosely 

 imbricated, the lobe widely spreading, somewhat falcate, ob- 

 long-obovate, 0.4 mm. long, 0.3 mm. wide, slightly convex, 

 rounded at the antical base and arching partially across the 

 stem, rounded at the apex, margin entire; lobule clavate, 0.17 

 mm. long, 0.08 mm. wide, inflated throughout, subparallel with 

 the stem and separated from it by about half its own width, 

 mouth obliquely rounded, stylus minute, filiform or subulate, 

 tipped with a hyaline papilla, mostly 4 or 5 cells long and 

 1 or 2 cells wide at the base; branch-leaves smaller than 

 the stem-leaves, relatively narrower and more closely imbri- 

 cated, 0.35 mm. long, 0.25 mm. wide, lobules similar to those 

 of the stem but close together and oblique, lying with their 

 rounded ends upon the axis and forming with it an angle of 

 about 45 ; leaf-cells plane or nearly so, averaging about 8 <i 

 at the margin of the lobe, 9 // in the middle and 18 x 12 it at the 

 base, walls more or less thickened and with indistinct trigones, 

 the portion lining the cavity being usually pigmented, ocelli 

 mostly in a single row of from 3 to 6 cells, running ob- 

 liquely from the stem between the axis of the lobe and the pos- 

 tical margin, averaging 28 x 23 jti in size, contents dark red, 

 ocelli of leaves subtending branches often in 2 rows ; inter- 

 leaves of stem distant, oblong with subparallel sides, 0.22 mm. 

 long, 0.17 mm. wide, neither cordate nor rounded at the base, 

 bifid one-half or less with a narrow, acute sinus and broad, 

 erect, rounded divisions, margin entire; underleaves of the 

 branches contiguous to subimbricated, often partially covered 

 over by the lobules, narrowly ovate or ligulate, 0.14 mm. long, 

 0.05 mm. wide, with narrow and often acute divisions ; inflores- 

 cence dioicous ; female inflorescence borne on a leading branch ; 

 bracts in 2 or 3 pairs, passing by insensible gradations into the 

 leaves, complicate and unequally bifid, lobes of innermost bracts 

 ovate to oblong, 0.75 mm. long, 0.35 mm. wide, narrowed 

 toward the apex but usually obtusely pointed, margin irregularly 

 sinuate, ocelli usually in 2 rows in lower third of lobe, lobule 

 ovate-lanceolate, 0.6 mm. long, 0.25 mm. wide, subacute at the 

 apex, bearing a cluster of short and irregular cilia at the base, 



