294 HEPATIC^E. 



3. Jungermania riparia, Taylor. 



Jimgermania riparia, Tayl. Ann. and Mag. Nat. ' Hist. August (1843). Spruce 



in Phyt. March (1843). 

 Jimgermania tristis, Nees Nat. Eur. Leb. 11, p. 461 (1836). 

 Jimgermania j)umila, var. notha. G. et R. n, 396. 

 Aplozia tristis, Dum, Hep. Eur, p. 63 (1874). 

 Aplozia rijmria, Dum, Hep. Eur. p. 65 (1874). 



Dioicous, csespitose, flagelliferous, small, pale to clarK olive- 

 green colour. Stems creeping or suberect, simple or branched, 

 flagella frequent, postical, branches lateral-subpostical, arising 

 from the postical side of the leaf axil, or frequently from base of 

 perianth ; radiculose, rootlets ascending to apex of stem, whitish, 

 somewhat thick. Leaves imbricate or approximate, alternate^ 

 obliquely inserted, horizontal, spreading, broadly ovate, oval, 

 oblong-ovate or orbicular ; whtre the branches arise the leaves are 

 sometimes (but very rarely) small, and acutely bifid, on sterile 

 stems decreasing in size towards the base and apex ; texture some- 

 what delicate, cells smallish to medium size, 4-, 5- and 6-sided, 

 quadrate or elongate, walls firm, no trigones or thickened angles. 

 Stipules absent. Bracts similar to leaves, usually broadly ovate, 

 spreading. No bracteole. Perianth projecting about f beyond 

 the bracts, fusiform or oblong-ovate, below smooth, slightly 

 frontally compressed, with a somewhat deep, antical furrow, 

 bordered by two distinct folds, near apex with from 5 to 8 folds, 

 mouth contracted, laciniate. Perigonial stems small, perigonial 

 bracts at the middle or terminal, erect, imbricate, complicate, 

 ventricose, smaller but proportionately broader than the stem 

 leaves ; antheridia oval, single. 



Dimensions, — Sten;is from |^ to 1 inch long, '1 mm,, '15 mm,, 

 •2 mn), diam. ; leaves 1'3 mm. long x 1"2 mm. broad, 1'2 mm, 

 X I'l mm., ri mm. x 7 mm., 9 mm. x 7 mm., "8 mm. x ■7mm. ; 

 cells "04 mm. x "025 mm., '04 mm. x '02 mm,, '03 mm, x "025 mm., 

 •025 mm. X '02 mm,; bracts 1'5 mm, x 1'25 mm., I'i mm. 

 X 1"5 mm.; perianth 2*4 mm, long x '75 mm. broad, "2 mm, 

 x 75 mm., 175 mm, x 75 mm. ; perigonial bract "8 mm. long 



