HANDBOOK OF BRITISH HEPATICtE. 35 



acuminate, echinately dentate, decurved, com- 

 plicate at the base ; involucral two - lobed, 

 entire; perianth terete, apex pentagonal, with 

 costate wings. 



Jungermannia hamatifolia (3 echinata, Hook. 

 Br. Jung. 51. Jungermannia calcarca, Lib. 

 Crypt Exs. No. in. Jungermannia echinata, 

 Tayl. in Spruce Trans. Bot. Soc. Edin. II., 

 88. Lejeunia calcarea, Lib. Ann. VI., 373, t. 

 96, f. 1 ; Gott. and Rab. Exs. No. 46, 283, 

 3 2 3> 3 6 5 ; Spruce Trans. Bot. Soc. Edin. III., 

 212; Carr. and Pears. Exs. No. 278; Cooke 

 Hep. f. 150. Cololejeuuia, Spruce.' 



On Limestone rocks. 



Very delicate and minute, so as scarcely to be 

 visible to the naked eye, loosely ^y 



and divaricately branched. Leaves f ^ 



ovate acuminate, echinulate and t \ 



denticulate with the projecting cells Vv, Hv-u h 1 



(fig. 27), falcate, decurved, sinuately L ^^ X, 



complicate at the base, the fold V ^xT~ 

 saccate, ovate, twice as short as ' l ^u A / 



the leaf. Involucral leaves bifid, \ / 



the laciniae entire. Perianth on a 27 . 



very short lateral branch, pear-shaped or clavate, 

 acutely five-angled, the long margins echinulately 

 muricate. — {Plate i,fig. 6.) 



Lejeunia ulieina, Taylor. 



Dioicous, very minute, stems thread-like, 



D 2 



