156 DIPLOPERISTOMI. \_Hypnum. 



Hypnum serpens. Linn. Sp. PL p. 1596. Turn. Muse. Hib. p. 

 168. Smth, Fl. Brit. p. 1306. Engl Bot. t. 1037. Moug. et Nestl. 

 n. 332. Hook. Fl. Scot. P. II. p. 142. Funck, Deutschl Moose, t. 45. 

 /. 50. Hobson, Brit. Mosses, v. 1. n. 70. Drummond, Muse. Scot. v. 

 1. n. 77. Brid. Meth. p. 183. Arn. Disp. Muse. p. 62. Schwaegr. 

 Suppl. v. 1. P. II. p. 260. 



Hypnum fluviatile. Funck, Deutschl. Moose, t. 45. / 49. Brid. 

 Meth. p. 182. 



Hypnum tenue. Schrad. 



Hypnum contextum, and H. spinulosum. Hedw. and H. flagelli- 

 forme, microphyllum, radicale, subtile, inordinatum ? and orthocladon ? 

 of Brid. 



Hypnum subtile. Dicks. Turn Smith, in Fl. Brit, and in Engl. 



Bot. t. 2496 Dill. Muse. t. 42. / 64. 



HAB. Moist banks, trunks of trees, on pales and decayed 

 wood in various situations. Mr. Drummond's specimens 

 are remarkably tufted, having been gathered on an old 

 wall near Forfar. 



Schwaegrichen has well observed of this species, " vix datur 

 exemplum tantse inconstantiae nervi in ullo Hypno;" for dif- 

 ferent leaves on the same individual have the nerve varying 

 much in length; yet in the older stems it will generally be 

 found reaching to the point, and of a dark brown colour. It is 

 the almost total disappearance of the nerve in some instances, 

 that has caused this moss to be mistaken for the Leskea subtilis 

 of Hedwig, which has the true fringe of a Leskea, and has not, 

 we believe, yet been found in Britain. The bapsules of H. 

 subtile in English Botany are figured from foreign specimens. 

 Our own examination of the Dillenian Herbarium does not 

 confirm the opinion of Mr. Turner, that the specimens re- 

 presented in the Historia Muscorum, t. 42. f. 64*. are those of 

 Leskea subtilis. We have accordingly referred to that figure 

 under the present plant. 



The specimens of Funck of H. fluviatile, seem to be only the 

 aquatic variety of H. serpens ; and if Hedwig's be the same, as 

 we really believe, then that must also be brought as a synonym 

 to the present species. 



Hedwig's figure of H. fluviatile is almost universally cited as 

 the same with H. Vattisclausce, or H. fallax of Bridel, and ap- 

 proaches as closely to it as to H. serpens. H. fallax of Bridel is 



