286 Mr. R. Spruce on the Musci and Hepatice of the Pyrenees. 
Hab. Zo. in umbrosis humidis ; circa B.-de-Bigorre haud raro 
fertile. 
3. Isothecium, Brid. Br. Univ. 2. p. 355. 
Obs. The four sections into which I divide this genus are separated 
from each other by such wide intervals, that I shall not be surprised 
if at some future period they be placed in at least as many different 
genera. The family of Hypnoid mosses requires to be completely 
rearranged, and this can only be done well by a person perfectly 
familiar with exotic species. 
Isoth. rufescens is found only on calcareous rock, and its stems are 
mostly incrusted below with carbonate of lime. J. lutescens seems 
to grow on no other rock than limestone, but it is also occasionally 
found on trees. ‘The three species of the last section prefer to grow 
on the living bark of trees, and J. striatum selects the slenderest 
twigs of subalpine shrubs and humble trees. 
§ 1. DenprorpEa. 
82. J. alopecurum, L. Sp. Pl. p. 1594 (sub Hypno) ; Schwer. 
Suppl. t. 227; M. P. 10. 
Hab. Z, in rupibus subhumidis, haud vulgare. 
83. I. Myurum, Pollich, Pl. Pal. 3. n. 1054. f. 8 (sub Hypno) ; 
M. P. 73. Hyp. curvatum, Sw. ; H. et T.! Muse. Brit. p. 102. 
t. 25. 
Hab. Z,_3 in sylvaticis, ad saxa et arborum truncos. 
“ Var. ramis incrassatis vix curvatis, operculo breviori ;” M. P. 
74; in rupibus terra obtectis pinetorum circa pontem d’ Espagne © 
dictum ; etiam secus lacum Séculéjo. 
84. I. myosuroides, L. Sp. Pl. p. 1596 (sub Hypno) ; E. Bot. 
t. 1567; M.P. 75. 
Hab. Z)-3 in umbrosis precipue secus rivulos, saxatile et ar- 
bustivum.—Folia nonnunquam subsecunda. 
§ 2. SericeEa. 
85. I. aureum, Lagasca in Ann. de Cienc. Nat. n. 14 (sub 
Hypno); Brid. Br. Un. 2. p. 469. 
Hab. Z, P. c. in rupibus prope lacum Espingo, sterile (?), 
socia Tayloria serrata. | 
The leaves are incorrectly described by Bridel as nerveless: in my 
specimens, as in others gathered by M. Schimper in the Sierra Mo- 
rena, the leaves are (like those of J. lutescens) strongly 3-plicate, the 
middle fold involving the nerve. 
86. I. lutescens, Huds. Fl. Angl. (sub Hypno). H. lutescens, 
Hedw. Muse. Frond. 4. t. 16; M. P. 88. 
Hab. Z, in terra rupibusque calcareis, necnon in arboribus.— 
Circa B.-de-Bigorre (locis Elysée Cottin, Bois d Asté, &c.) eap- 
sulis ovato-cylindricis fere erectis ludit. 
