Mr. R. Spruce on the Musci and Hepaticce of the Pyrenees. 485 



sitis ;" M. P. 234 ; et Hymenostomum muraley M. P. 236 {forma 

 hymenostomoidea) . 



Hab. Zj P. occ. in arenosis circa Pau et Oloron; No. 236. 

 M. P. in muris prope Ste. Marie d'Oloron. 



The moss published in ' Musci Pyrenaici ' as Hymenostomum mu- 

 rale (n. sp.) 1 have ascertained to be a form of Weisia Wimmeriana. 

 Not one of the capsules I at first examined showed the least trace of 

 peristome, but by renewed search I have at length found a capsule 

 in which there are a few pale rudimentary teeth, scarcely rising 

 above the annulus. As some excuse for this, it may be mentioned 

 that Weisia Wimmeriana was originally referred to Gymnostomum by 

 both Sendtner and Schimper. 



56. Hymenostomum, R. Brown. 



300. H. microstomum, Hedw. Muse. Frond, p. 71. t. 30 (sub 

 Gymnostomo) ; Br. Europ. Hymenost. p. 4. t. 1. 



Hab. 7j^ ad terranij rarissime ! B. -de-Big orre. Pyrenees Oinen- 

 tales (Montagne !). 



301. H. tortile, Schwgr. Suppl. t. 10 (sub Gymnostomo) ; 

 M. P. 237. 



Hab. Zi inf. P. occ. in muris prope Pau. P. c. in rupibus calca- 

 reis juxta thermas diet, de Salut, B.-de-Bigorre, Circa Mont- 

 pellier et Vaucluse (Arnott !). 



57. Gymnostomum, Hedwig. 



302. G. calcareum, H. et N. Bryol. Germ. p. 183. t. 10; Br. 

 Europ. Gymnostomum, p. 6. t. 3, 4; M. P. 239. 



Hab. Zj in calce arenato murorum ad pedem Pyr. occidenta- 

 lium. — Var. j3. tenellum, Br. Europ. /. c. ; Pau, Jurancon, &c. — 

 Vars. 7. viridulum (= G. viridulum, Brid.) et h. gracillimum 

 (= G. gracillimum, Br. Germ.) ; Rontignon et Pau. 



This species varies exceedingly in the length of the leaves and in 

 the form of their apices. A small variety on walls at Pau has the 

 leaves shortly ligulate, mostly widest above the middle, and often 

 quite rounded at the summit. In the village of Rontignon, which is 

 seven or eight miles higher up the banks of the Gave de Pau, the 

 varieties y. and ^. grow intermixed, both having the leaves for the 

 most part subacute. All the forms observed in the Pyrenees have 

 far wider and shorter leaves than specimens I have received from the 

 Alps, and I never once met with the form considered by Bruch and 

 Schimper as the type of the species. [Confer ' Bryol. Europaea/ 

 monogr. Gymnost. p. 7 ; where however it is said by mistake that my 

 specimens were gathered " in schisto micaceo ;" but it is nevertheless 

 true that the mortar used in the neighbourhood of Pau, being made 

 of lime mixed with the sand of the Gave de Pau, contains particles of 

 mica, granite, &c. brought down from the mountains by this stream 

 and its tributaries.] 



