OHTHOTRICIIIKI. 225 



Forming dense yellow- green cushions or patches. Veil 

 straw-coloured with a brown tip, slightly hairy ; sporangium 

 yellow-brown, with very prominent orange striae, cylindrical 

 and contracted below the orifice when dry; interstices some- 

 times transversely wrinkled; lid short, blunt; teeth orange; 

 cilia sixteen, nearly equal in length, rarely eight ; base of 

 leaves hyaline with oblong cells, which are almost confined to 

 the disk; tip often slightly eroded. 



13. O. Sprucei, Mont. ; mouoicous ; stems short, tufted; 

 leaves slightly spreading, erect and imbricated when dry, 

 oblongo-spathulate or oblong, apiculate, flaccid, obscurely 

 nerved ; margin nearly plane ; sporangium pyriform, widely 

 striate ; veil naked ; lid short, subconical ; teeth in eight 

 pairs; cilia sixteen or eight. Hook. Wils. t. xlv. 



On trees near rivers. Occasionally from the Clyde to the 

 Thames. Bearing fruit in early summer. Not found at pre- 

 sent on the Continent. 



Forming short tufts. Stems sparingly branched ; leaf-cells 

 large, not papillose; sporangium half immersed. 



The leaves in this curious species have no tendency to be 

 lanceolate ; the apex is rather blunt, with a little apiculus ; 

 the margin is widely reflexed ; the leaf-cells are ranch larger 

 than in most species, not papillose, and those at the base do 

 not differ greatly from the others in length ; the nerve in the 

 lower leaves reaches scarcely above the middle and vanishes 

 below the apex in the upper. 



14. O. rivulare, Turn. ; stems elongated, decumbent, or 

 pendulous ; leaves spreading, flaccid, loosely imbricated when 

 dry, ovato-lanceolate, obtuse ; margin recurved ; sporangium 

 pyriform, widely striate; veil naked ; teeth in eight pairs, re- 

 flexed when dry; cilia sixteen. Hook. Wils. t. xxi.; Ertg. 

 Bot. t. 2188. ; (Moug. $ Nest. n. 824.) 



Q 



