CESIA. 395 



3. Cesia crassifolia {Can:), Lindb, 



Gymnomitrium cvassi folium, Carr. Trans. Bot. Hoc. Edinb. xiii. p. 401 (1S71I). 

 Cesia crassifolia (Cavr.), Lindb. in Meddel. soc. F. Fl. Fenn. xiv. p. IX (188<s); 

 Kaalaas, Leverm. Norge, p. 427 (l.s!)o). 



Dioicous, pulvinate, stoloniferoiis, smull, dark olive-brown to 

 black in colour. Stems simple or branched, branches usually 

 innovant ; stout, decumbent at the base, the apex ascending, sub- 

 terete, fertile ones clavate ; radiculose, rootlets abundant, long, 

 tawny. Leaves smaller at the base, of nearly equal size upwards, 

 densely and closely imbricated, erecto-secund, about twice the 

 breadth of the stem, orbiculate or oblong-orbiculate to subquad- 

 rate, very concave, emarginate from ^ to 1, sinus acute or obtusate, 

 sometimes lunate, segments subacute, margin entire ; texture 

 thick, firm, subopaque, cells small to smallish, roundish or near 

 basal middle roundish-oblong and slightly larger, walls firm, 

 thick, trigones distinct. No stipules. Bracts larger than the 

 leaves, subquadrate, bilobed from ^ to almost the middle, sinus 

 acute, segments acute or obtusate, entire. Innermost bracts free 

 from the outer, about J shorter, lobate-dentate, delicate texture. 

 Calyptra campanulate, 8 pistillidia dispersed over it. Capsule 

 spherical, cinnamon-brown, thick-walled, pedicel firm. Spores 

 pale brown, roundish or roundish-oblong, surface irregular; elaters 

 similar in colour, bispiral, narrowly fusiform. Male stems erect, 

 terete, subclavate, apex obtuse ; perigonial bracts closely imbri- 

 cated, erecto-patent, somewhat broader, tumid at the base ; 

 antheridia numerous, solitary in the axils of the bracts, roundish- 

 oval, pedicel short, 3, 4 binate cells. 



Fruits in early Summer. 



Dimensions. — Stems J to ^ inch long, diameter "1 mm., with 

 leaves '5 mm. wide, near clavate apex •75 mm. wide; leaves "4 mm. 

 long X "35 mm. broad, seg. '! mm., '375 mm. x -3 mm., seg. 

 •1 mm., -3 mm. x "3 mm., seg. '075 mm., upper leaves -C mm. x 

 •45 mm., seg. '1 mm. ; cells '025 mm. x '0:^5 mm., '025 mm. x 

 •02 mm., "015 mm. x '02 mm., '03 mm. x "02 mm. ; bracts 1" mm. 

 long X "75 mm. broad, segments 2 mm., 1" mm. x "9 mm., seg. 



