286 Mr. R. Spruce on the Musci and Hepatica of the Pyrenees. 



Hah. Zo_2 in umbrosis humidis ; circa B.-de-Bigorre baud 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. ru/escens is found only on calcareous rock, and its stems are 

 mostly incrusted below with carbonate of lime. /. hitescens 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 /. striatum selects the slenderest 

 twigs of subalpine shrubs and humble trees. 



§ 1. Dendroidea. 



82. /. alopecurum, L. Sp. PI. p. 1594 (sub Hijpno) ; Scliwgr. 

 Suppl. t. 227 ; M. P. 10. 



Hah. Zj in rupibus subhumidisj baud vulgare. 



83. /. Myurum, Pollicb, PI. Pal. 3. n. 1054. f. 8 (sub Hijpno) ; 

 M. P. 73. Hyp. curvatum, Sw. ; H. et T. ! Muse. Brit. p. 102. 

 t.25. 



Hab. Zo_3 in sylvaticis^ ad saxa et arborum truncos. 



" Var. ramis iucrassatis vix curvatis, operculo breviori;" M. P. 

 74 ; in rupibus terra obtectis pinetorum circa pontcm d'Espagne 

 dictum ; etiam secus lacum Seculejo. 



84. /. myosuroides, L. Sp. PI. p. 1596 (sub Hypno) ; E. Bot. 

 t. 1567 ; M. P. 75. 



Hah. Zo— 3 in umbrosis prajcipue secus rivulos, saxatile et ar- 

 bustivum. — Folia nonnunquam subsecunda. 



§ 2. Sekicea. 



85. /. aureum, Lagasca in Ann. de Cienc. Nat. n. 14 (sub 

 Hypno); Brid. Br. Un. 2. p. 469. 



Hah. Z3 P. c. in rupibus prope lacum Espingo, sterile ( ? ), 

 socia Tayloria serraia. 



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 /. lutescens) strongly 3-plicate, the 

 middle fold involving the nerve. 



86. I. lutescens, Huds. Fl. Angl. (sub Hi/pno). H. lutescens, 

 Hedw. Muse. Frond. 4. t. 16 j M. P. 88. 



Hah. Zj in terra rupibusque calcareis, necnon in arboribus. — 

 Circa B.-de-Bigorre (locis Elysee Cottin, Bois d'Aste, &c.) cap- 

 sulis ovato-cylindricis fere erectis ludit. 



