252 HANDBOOK OK BRITISH HEPATICiE. 



midrib. Involucre monophyllous, torn, at first 

 terminal from the costa. Perianth tubular, 

 mouth denticulate. Calyptrachartaceous, equal 

 or shorter than the perianth, torn at the apex. 

 Capsule four-valved. Elaters bispiral, decidu- 

 ous. Spores minute. — Gray Arr. Br. PI. 

 (1821); Spruce Hep. Amaz. p. 536. 



Pallavicinia Lyellii, Lindb. 



Frond procumbent, rather branching. Invo- 

 lucre fimbriate. Perianth cylindrical, scarce 

 touching the calyptra. 



Jungermannia Lyellii, Hook. Br. Jung, 

 t. 77 ; Dilccna Lyellii, Dumort. Hep. Eur. p. 

 137; Blyttia Lyellii, Lind. G. and N Syn. 

 Hep. p. 475; Gott. and Rabh. Exs. No. 121 ; 

 Carr. and Pears. Exs. No. 144; Cooke Hep. 

 fig. 168. Pallavicinia Lyellii, Spruce Hep. 

 Amaz. p. 537. 



In bogs. (Fr. May.) 



Growing in small matted patches. Frond about 

 1 inch long, or twice that length, horizontally 

 pressed to the ground, or matrix, oblong, nearly 

 linear, simple, or shortly branched laterally, or 

 forked at the extremity (fig. 174) ; margin waved, 

 frequently entire, now and then with a few distant 

 unequal teeth, a distinct nerve running down the 

 centre, rather prominent on both sides, of a pale 

 green colour. Innovations not unfrequent, from 



