Mr. R. Spruce on the Musci and Hepatice of the Pyrenees. 485 
sitis ;? M. P. 234; et Hymenostomum murale, M. P. 236 (forma 
hymenostomoidea). 
Hab. Z, P. oce. 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.) I 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. 
800. H. microstomum, Hedw. Muse. Frond. p. 71. t. 80 (sub 
Gymnostomo) ; Br. Europ. Hymenost. p. 4. t. 1. 
Hab. Z, ad terram, rarissime! B.-de-Bigorre. Pyrénées Orien- 
tales (Montagne !). 
301. H. ¢ortile, Schwgr. Suppl. t. 10 (sub Gymnostomo) ; 
M. P. 237. 
Hab. Z, ine, P. occ. in muris prope Pau. P. ¢..in rupibus calca- 
reis juxta thermas dict. de Salut, B.-de-Bigorre. Circa Mont- 
pelher et Vaucluse (Arnott !). 
57. Gymnostomum, Hedwig. 
802. G. calcareum, H. et N. Bryol. Germ. p. 183. t. 10 ; Br. 
Europ. Gymnostomum, p. 6. t. 3, 4; M. P. 239. 
Hab. Z, in calce arenato murorum ad pedem Pyr. occidenta- 
lium.—Var. £8. tenellum, Br. Europ. l. c.; Pau, Jurancon, &e.— 
Vars. y. viridulum (= G. viridulum, Brid.) et 6. 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 6. 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. Europea,’ 
monogr. Gymnost. p. 7; where however it is said by mistake that my 
specimens were gathered “ in schisto micaceo ;” but it isnevertheless 
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. } : 
