252 HANDBOOK OF BRITISH HEPATICii:. 



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, Li?idb. 



Frond procumbent, rather branching. Invo- 

 lucre fimbriate. Perianth cylindrical, scarce 

 touching the calyptra. 



Jitngerniannia Lyellii, Hook. Br. Jung, 

 t. JJ ', 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 

 I 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 



