378 Mr. R. Spruce on the Musci and Hepaticce of the Pyrenees. 



240. T. vinealis, Brid. Br. Univ. 1. p. 830 (sub Barbula) ; Br. 

 Europ. /. c. p. 24. t. 10. 



Var. ^.fiaccida, Br. Europ.; M. P. \M.—Hab. Zj P. c. ad 

 ripas rivuli qui ad monasterium Medous prope B.-de-Bigoi-re ori- 

 gineni suam habet. 



Var. niimlis, M. P. J 85. — Hab. Z4 in rupibus frigidis ab aqua 

 nivali irrigatis vallis alpinse Esquien-y dictse. 



This second variety forms large compact tufts on the ledges of 

 dri))ping rocks, growing near Senecio Tournefortii, Euphrasia minima 

 and Luzula spadicea. The stems attain a length of 6 or 8 inches, and 

 are clad throughout with leaves of a deep reddish brown. Hence its 

 aspect is very different from that of the ordinary form of T. vinealis, 

 but without the fruit I do not venture to separate it. 



4] . Didymodon, Schwgr. [ex parte) . 



241. D. rubellus, Hoffm. Deut. El. 2. p. 33 (sub Bryo); Br. 

 Europ. Didymodon, p. 3. t. 1 ; M. P. 186. Weisia curvirostra, 

 H. et T. ! Muse. Brit. p. 84. t. 14. 



Hab. Zo_2 in muris, rupibus, &c. 



242. D. cylindricus, Bruch in Brid. Br. Univ. 1. p. 806 (sub 

 Weisia) ; Br. Earop. /. c. p. 5. t. 3 ; M. P. 187. 



Hab. Z2 P. occ. in saxis rivulorum supra thermas diet, les Eaux 

 Bonnes; P. e. in vicinia B.-de-Lxchon, frequens, locis Superba- 

 gneres, Lac de Secu/ejo, Cascade du Cwur, &e. 



42. Trichostomum, Hedwig. 



Obs. T. flexicaule is the only species of this genus which seems 

 absolutely confined to calcareous rock : T. mutabile, crispulum and 

 tophaceum were observed on no other rock in the Pyrenees, but in 

 England I have occasionally seen them in habitats where no trace of 

 carbonate of lime was to be detected. The last five species form 

 part of the genus Leptotrichvm of Hampe, and are placed by C. Muel- 

 ler in his tribe Leptotrichacea. (Conf. Syn. Muse. p. 41.5). 



§ 1. Crispula. 



243. T. mutabile, Brueh mst. ; Br. Europ. Trichostomum, p. 8. 

 t. 5 ; M. P. 188. 



Hab. Z, locis calcareis. P. occ. ad pagum Narcastet. P. c. in 

 rupibus umbrosis prope B.-de-Bigorre [Chemin de Labassere et 

 Bains de Saluf) . An revera a sequente distincta species ? 



244. T. crispulum, Bruch et Muell. in Regensb. Bot. Zeitung, 

 1829; Br. Europ. /. c. t. 4; M. P. 189. Didymodon Benthamii, 

 Arnott ! in Edinb. New Philosoph. Journ. 1846. 



Hab. Zj in rupibus calcareis irroratis Pyren. occidentalium, 

 frequens. Pau ; Narcastet, &c. Restinclieres prope Montpellier 

 (Arnott !). 



