IIYPNtl. 81 



On stones, trunks of trees, shady ground, etc. Extremely 

 common. Fruit perfect in winter and early spring. 



Monoicous ; robust, forming dark green or sometimes yel- 

 lowish-green tufts. Stem procumbent, irregularly branched; 

 branches erect ; leaves erccto-patent, ovate, acuminate, con- 

 cave, narrowed at the base, serrated through their whole 

 length, slightly striate when dry; nerve slender, reaching more 

 than halfway up ; cells loose, especially at the base ; perichaetial 

 leaves squarrose, with a long tip ; fruitstalk stout, 1 inch long, 

 strongly granulated ; sporangium ovate and turgid or ovate- 

 oblong, arcuate, cernuous ; lid large, conical, sharp-pointed. 



Like most common species, this is very variable, but it is 

 distinguished by its rough fruitstalk, the absence of striae 

 in the leaves when moist, and by the monoicous inflorescence 

 from H. salebrosum, rivulare, ccespitosum, etc., which could 

 possibly be confounded with it. The stems often become 

 arched and take root at the extremity, and are frequently 

 clothed beneath with short purple-brown rooting hairs. 



9. H. rivulare, Bruch, mss. ; stems arched, irregularly 

 branched ; branchlets curved ; leaves large, loosely set, patent, 

 ovate or ovate-oblong, decurrent at the base, acuminate, ser- 

 rate ; nerve reaching more than halfway ; fruitstalk rough ; 

 sporangium ovate, incurved, cernuous ; lid conical, rather 

 acute. Hook. $ Wils. t. Iv. ; (Plate 5, fig. 6) ; Moug. $ Nest, 

 n. 1134 



On the borders of streams, on stones and rocks, or in the 

 beds of rivulets from Lancashire to Sussex. Not uncommon 

 in Wales. Perfecting fruit in autumn. 



Dioicous ; forming bright or yellow-green tufts. Branches 

 at first attenuated ; leaves not crowded, patent, ovate or ovate- 

 oblong, acuminate, serrate, with a decurrent base ; cells loose, 

 especially at the base ; nerve reaching more than halfway up ; 



G 



