210 HEP AT ICE. 



for the size of plant, frontally compressed, 20 cells x 15, inner 

 cells distinct, hyaline, two outer rows of cells brown ; short, 

 simple, or with 2-3 innovant branches produced from the axil of 

 old bracts, suberect or creeping ; radiculose, rootlets copious, of a 

 dirty-white colour. Leaves transversely inserted or a little 

 ascending, few, accrescent, bifarious, alternate, lower ones minute, 

 scale-like, middle contiguous, upper closely imbricate, vaginate, 

 unequally bilobed from about a fourth to a third, margin entire, 

 sometimes erose, antical lobe about a third smaller, oblong, oval 

 to subquadrate, apiculate, acute or obtuse, undulate, recurved or 

 incurved, postical lobe oval, obtuse or rotundate ; texture some- 

 what lax, epidermis smooth, cells near middle at the base 

 elongate-quadrate, medium size, near the apex rather minute, 

 subquadrate, cell-walls somewhat thin, angles a little thickened, 

 no trigones. Bracts large, similar to upper leaves, lobes more 

 equal. Perianth projecting about a third to half beyond the 

 bracts, terminal, obovate, compressed, mouth truncate, wide, 

 entire, a little uneven. Male stems with perigonial bracts 

 terminal or at the middle, ventricose, antical lobe more erect, 

 antheridia oval. Gemmiparous, gemmje whitish-green to brown, 

 biseptate, terminal, sometimes forming brownish-black spherical 

 masses. 



Fruits April, May. 



Dimensions. — Stems about |- in. long, "3 mm. to "4 mm. diam., 

 with leaves 25 mm. to 275 mm. wide ; leaves, antical lobe 1*2 mm. 



X -65 mm., postical 1"5 mm. x 75 mm., antical 1*1 mm. x '5 mm., 

 postical 1*5 mm. x 75 mm., antical 1*3 mm. x "75 mm., postical 

 1*5 mm. X '75 mm. ; upper leaves, antical lobe 175 mm. 



X 1*25 mm., postical 2* mm. x 1' mm. ; cells, basal '06 mm. 



X '025 mm., 04 mm. x '02 mm., '04 mm. x '025 mm., near apex 

 of leaf '025 mm. x 015 mm., '02 mm. x '015 mm., "015 mm. 



x 'OlS mm.; bracts, antical lobe 175 mm. x T mm., postical 

 2* mm. X r mm.; perianth 2*25 mm. x ri5 mm. at mouth, 

 gemmge "02 mm. x '01 mm. 



Hab. — Growing on damp, shady rocks by streams ; very rare. 

 10. "Near the " Strid," Bolton Woods, Yorkshire, Dr. 



