282 HEFATICjS. 



leaf X 290 (ditto). 6, 7. Perigonial bracts x 24 (ditto). 

 8. Antheridium x 85 (ditto). 



7. Plagiochila exigua, Tai/1. 



Jungermania exigua, Tayl. in Trans, Bot. Soc. Ed. 1, p. 179 (1843). 

 Plagiochila exigua, Tayl. in Lond. Journ. Bot. v. p. 264, n. 14 (1846). 



Csespitose or creeping upon other larger species, very small, of 

 a light green to olive-brown colour. Stems ascending or procum- 

 bent, slightly radiculose up to the apex, rootlets dull white, pro- 

 ceeding from the postical side of the stem below the stipules, in 

 small fascicules ; filiform, cortical cells oblong-quadrate, about 10. 

 Leaves obliquely inserted, slightly decurrent antically, patent to 

 patent-divergent, 55°, alternate, remote, but forming small capitula 

 at the apex of the stem, caducous, roundish obovate, obovate, or 

 cuneate, from a narrow base, margin quite entire, bifid from about 

 ^ to J, sinus rounded, segments acute or obtusate ; texture delicate, 

 cells very small to small, subquadrate, lumen clear, walls thick, 

 angles thickened, no trigones. Stipules evident, persistent, subu- 

 late, entire, 5-7 single cells long. Neither male nor female yet 

 seen. 



Dimensions. — Stems J to |^ inch long, diam. -1 mm., with 

 leaves 75 mm. wide ; leaves "5 mm. x "3 mm., segments "175 mm., 

 •4 mm. X 'S mm., seg. '15 mm., "35 mm. x -25 mm., seg. '1 mm., 

 "275 mm. x '175 mm., seg. "1 ram., '5 mm. x "45 mm., seg. 

 '175 mm., -4 mm. x -3 mm., seg. '15 mm., '35 mm. x "25 mm., 

 seg. '1 mm. ; cells "025 mm. x -0175 mm., '02 mm. x -0175 mm., 

 •0175 mm. x -015 mm. ; stipules -175 mm. x '03 mm. wide at the 

 base. 



Hab. — Epiphytic on tufts of Frullania, Badula, &c. ; about the 

 bases of moss-covered trees at Cromaglown and Killarney, Br. 

 Taylor. On wet rocks, Knockavoila and Dunkerron, Br. Taylor. 

 Tore Mountain, on Frullania Tamarisci, Br. Taylor. Killarney, 

 Br. Carrington. Glengariffe, Br. Carrinyton. O'Sulli van's Cas- 

 cade and Grlena, Br. Moore. Adrigole, near Glengariffe, Bev. C. 

 H. Binstead, 



