290 HEFATIC^E. 



1. Jungermania cordifolia, Hooker. 



Jungermania cordifolia, Hook. Brit. Jung. t. 32 (1810). 



Jungermania tersa, Nees Nat. Eur. Leb. 1, p. 329 (1833), fide letter from 



Dr. Gottsche to Dr. Spruce. 

 A]jilozia cordifolia, Dum. Hep. Eur. p. 50 (1874). 



Dioicous, laxly casspitose, flag-ella absent, large, dark olive- 

 green in colour, when young pa]e recldish-brown. Stems simple 

 or dicliotomously branched, branches lateral-subpostical {^rising 

 Irum the postical aspect of the leaf axil, often several (3-6) arising 

 from the base of old bracts, suberect or floating, lax, oval on cross- 

 section, 12 cells X 20, cortical cells 40, similar to the inner, 

 hyaline, walls thin, firm, dark-brown ; rootlets absent. Leaves 

 transversely inserted, succubous, decurrent antically, slightly so 

 postically, suberect, subinibricate or approximate, accrescent, sub- 

 opposite near apex, close, lower smaller, alternate, distant, cordate 

 or ovate-oblong, sheathing, amplexicaul ; texture flaccid; cells 

 smallish to medium in size, 4-, 5- and 6-sided, lumen with 

 numerous chlorophyl granules, walls firm, thick, reddish-brown, 

 no trigones or thickened angles. No stipules. Bracts similar to 

 the upper leaves, sub-vertical, ventricose-concave. No bracteole. 

 Perianth almost hidden by the bracts, projecting only about J, 

 fusiform, acute, very slightly plicate near the apex, near the base 

 composed of 3 layers of cells, lower half of 2, upper half of 1 

 only, interior layer of cells convex ; mouth contracted, very small, 

 laciniate, lacinise entire. Perigonial bracts swollen near the base ; 

 antheridia two in each bract, oval. 



Dimensions. — Stems from 1 to 4 inches long, "3 mm. to "4 

 mm. diam. ; leaves 2-25 mm. long x 2-25 mm. broad, 2" mm. x 

 175 mm., 1-75 mm. x 1'3 mm., 1'6 mm. x 1-3 mm., 1*5 mm. x 

 1-25 mm.; cells '035 mm. x -025 mm., -025 mm., -02 mm.; 

 perianth 4*5 mm. long x 1-25 mm. broad; young perianth 

 2'25 mm. x 75 mm. 



Hab. — Growing in large patches on rocks and earth by the 

 side of mountain rills, often submerged in the water. Somewhat 

 rare. 



