120 HEPATIC^. 



cserulescent. Steins creeping, horizontal, irregularly subpinnate 

 or sub-bipinnate, flexuose, on a cross-section 12 to 15 cells in diam., 

 hyaline, cortical larger, about 30 ; branches all lateral, some 

 attenuate ; radiculose, rootlets numerous, near base of the plant, 

 fasciculate, hyaline. Leaves incubous, imbricate or subimbricate 

 on main stem, on branches, and attenuated branches small and 

 distant, patent or patent-divergent, convex, subquadrate or semi- 

 oval, slightly longer than broad, quadri-dentate to about ^, seg- 

 ments acute, 4-7 cells broad at the base, sinus acute, apices 

 incurved, branch leaves tridentate, axillary leaves bidentate ; cells 

 medium size, subquadrate, often broader than long, Lubopaque, 

 walls thick, but somewhat delicate, no trigones or thickened angles. 

 Stipules about twice the width of the stem, very convex, sub- 

 quadrate, broader than long, quadrifid to about a third, on branches 

 trifid, segments acute. Bracts several pairs at the base of the 

 perianth, very delicate texture, subrotund or broadly oval, irregu- 

 larl}'- dentate at the apex ; bracteole very delicate texture, oval or 

 broadly oval, irregularly dentate at the apex. Perianth produced 

 on very short postical branches, projecting f beyond the bracts, 

 almost hyaline, sub-membranaceous, lower half composed of two 

 Iciyers of cells, upper half of a single layer, near the middle about 

 100 cells round, oblong-subulate, below cylindrical, above some- 

 what plicate, mouth constricted, dentate, teeth about 8. Calyptra 

 large, oval, composed of one layer of cells, Pistillidia few, 4 or 5. 

 Capsule oblong-ovate, deep brown, splitting into 4 equal lanceolate 

 valves. Spores small, verruculose, reddish-brown. Elaters bispiral, 

 not quite as broad as the spores, reddish-brown. Andnpcia 

 postical, amentiform, catkins small, composed of 4-6 pairs of 

 perigonial bracts, which are minute, delicate, complicate, broadly 

 oval when explanate, bidentate to about a fourth ; perigonial bract- 

 eoles oval, bidentate. 



Dimensions. — Stems 1 to l^ long, "2 mm. to '3 ram. in diam., 

 with leaves 1* mm. wide ; leaves 7 mm. x -6 mm., segments "l 5 mm., 

 •6 mm. X "45 mm. seg. '2 ram. ; cells '025 mm. x '025 mm., '035 

 mm. x '03 mm., "045 mm. x '035 mm ; stipules "4 mm. x '4 mm., 

 segments "2 mm., 4 mm. x -45 mm. seg. "15 mm.; bract 'TS 



