87 



branches, with loosely set, ovate, acute, serrated leaves, of a 

 bright shining green, acute rather than acuminate (in Sussex 

 specimens) ; cells broader than in the two preceding species ; 

 fruitstalk scabrous ; sporangium obovate or ovate- oblong, cer- 

 nuous ; lid rostrate, shorter than the sporangium. 



This species has not at present been found on the Con- 

 tinent. 



16*. H. cirrhosum, Schwag. ; stem erect or procumbent, 

 sparingly branched ; branches erect, cylindrical ; leaves im- 

 bricated, elliptic-oblong, concave, shining, ending in a long, 

 hair-like, serrated point ; cells rhomboid, broader at the base ; 

 nerve simple or forked. 



Top of Ben Lawers, Dr. Arnott. Not yet found in fruit. 

 Supposed by Schimper to be a Brachythecium. Possibly, 

 according to Wilson, a variety of H.piliferum. Its immediate 

 affinities, however, must be doubtful, in the absence of fruit. 



17. H. prselongum, L. ; stem prostrate, elongated, loosely 

 branched or subpinnate ; branches short, acute ; leaves loosely 

 set, cordate, acuminate, serrated ; nerve reaching more than 

 halfway up ; fruitstalk rough ; sporangium oblique ; lid 

 strongly rostrate. Hook. Wils. t. xxv. ; Eng. Boi. t. 2035, 

 2im,/ 3. (Mouff. fyNest. n. 422.) 



On the ground, on decayed wood, etc. Common. Fruit 

 matured in winter. 



Dioicous; forming flat patches, with long, arched, or 

 prostrate stems, sometimes loosely branched, sometimes irregu- 

 larly bipinnate ; branches short, more or less acute ; leaves not 

 crowded, squarrose, cordate, acuminate, strongly serrate ; nerve 

 reaching far above the centre ; cells narrow ; fruitstalk about 

 half an inch high, rough ; sporangium ovate-oblong, set on 

 obliquely, cernuous; lid with a very long, acute beak. 



A very variable species, differing occasionally greatly in 



