HANDBOOK OF BRITISH HEPATIC^. 241 



ends, where are the antheridia, perigonial leaves 

 but little altered, more swollen at the base, and 

 rather broader. Antheridia few, oval, on a pe- 

 duncle of the same length. (Plate 6, fig. /<?.) 



Gymnomitrium erassifolium, Carr. 



Pulvinate, stoloniferous, branches ascend- 

 ing, fertile, clavate, without stipules, leaves 

 imbricate, orbiculate, acutely emarginate, con- 

 cave, segments short, acute, of thick texture, 

 minutely papillose, margin entire. Outer in- 

 volucral leaves much larger, free, cleft half 

 way into two obtuse lobes, inner involucra 

 shorter, three-lobed, connate, ciliate, dentate. 



Gymnomitrium crasstfblium, Carr. Trans. 

 Bot. Soc., Edin. XIII., 461, t. 18, f. 3 ; Carr. 

 and Pears. Exs. No. 76. 



In Alpine situations. 



Forming broad shallow compact tufts of a dark 

 olive brown colour, nearly black when dry. 

 Stems 3-5 mm. long, simple, rhizomatous, 

 stout, decumbent at base, with tawny radicles 

 on the underside, fertile shoots erect, sub- 

 clavate. Leaves smaller at the base, of nearly 

 equal size upwards, closely imbricate, erect, secund, 

 embracing and hiding the stem, roundish, thick, 

 very convex, emarginate, segments and sinus 

 angular, margin entire, surface minutely papillose, 

 colour dull olive brown, subopaque. Dioicous. 

 Male shoots erect, terete, apex obtuse. Perigonial 

 leaves somewhat broader, tumid at the base, 



R 



