192 HEPATIC u^. 



14. Portion of mouth of perianth x -85. 15, 16. Perigonial 

 bracts x 85. 17. Antheridium x 85 (Killarney, S. 0. Lindberg). 



Genus IG. PLEUROCLADA, Spricce. 



Jungermania, Hook. Brit. Jung. t. 72 (181 G). 

 Cephalozia, Dum. Kecueil, p. 18 (1835). 

 Fleuroclada, Spr-uce, On Cephalozia, p. 78 (1882). 



Differs from its ally Hijf/rohiella by its glaucescent colour 

 stems radiculose, all the length subsequifoliate, neither rhizomatous 

 nor flagelliferous at the base, subpinnate ; all branches lateral, at 

 the base, near the stem-leaf difformed (monolobed) ; leaves very 

 concave (hardly complicate) ; perianth very fleshy, below 8 cells 

 thick, subfloral innovations wanting. 



1. Pleuroclada albescens [Hook.), Sjjruce. 



Jungermania albescens, Hook. Brit. Jung. t. 72 et suppl. t. 4 (181fi). 

 Ceplmlozia albescens, Dum. Recueil, p. 18 (1835). 

 Pleuroclada albescens, Spruce, On Cephalozia, p. 78 (1882). 



Dioicous, csespitose, tufts depressed, eflagelliferous, small to 

 medium in size, of a whitish or greenish colour, when drj^ with a 

 bluish-white tinge. Stems procumbent, laxly subpinnate, some- 

 times subdichotomous, slightly radiculose, rooting up to apex of 

 stem ; firm oval-terete, composed of 5 concentric subequal layers 

 of opaque cells, cortical about 25, slightly larger than the inner. 

 Leaves somewhat distant or approximate, patulous, almost trans- 

 versely inserted, slightly succubous, orbiculate, very concave, 

 almost hemispherical, to about the third or a little more bilobed, 

 segments ovate, triangular, connivent, acute, sinus narrow, acute 

 or subobtuse ; cells medium in size, quadrate-hexagonal, 4-, 5- and 

 6-sided, thick but subleptodermous, almost smooth, slight!}^ endo- 

 chromic, subpellucid, walls firm, somewhat thick, angles only 

 slightly thickened, no trigones. Axillary leaf produced partly 

 from the stem and partly from the adnate branch, differs from the 

 other leaves in being broadly ovate, subcordate at base, apex acute, 



