HANDBOOK OF BRITISH HEPATIOE. 85 



subimbricate, horizontal, subquadrate, rounded 

 at the apex, and acutely multidentate ; stipules 

 deeply bifid ; laciniae awl-shaped, divergent ; 

 perianth triquetrous, mouth three-lobed, den- 

 tate. 



Calypogeia arguta, Mont, and Nees Eur. 

 Leb. 3, p. 24. Cincinnulus argutus, Dumort. 

 Hep. Eur. p. 117. Kantia arguta, Carr. and 

 Pears. Exs. No. 188, 189; Gott. and Rab., 

 Ex. 167. 



On trunks. 



Stems 2 to 3 inches long, sparingly branched, in- 

 novant. Leaves very variable on the same stem, 

 subquadrate, or elongated subquadrate, rounded 

 at the apex, armed with acute teeth, at the base 

 of the stem a little broader, in others more ovate, 

 and the apex (without the teeth) truncate, leaves 

 of young shoots bidentate, or tridentate, plane, 

 different from the leaves of the adult plant. In the 

 adult plant the apex of the leaves is armed with 

 five or six (even seven) teeth, which are curved or 

 connivent. Stipules everywhere with one side 

 decurrentwith the subjacent leaf, bipartite, segments 

 lanceolate. Fructification ventral, on a very short 

 branch. Involucral leaves similar to the cauline, but 

 a little smaller, involucral stipules larger than the 

 cauline, quadridentate, subinvolucral leaves not half 

 the size of the cauline. Perianth obovate, or cylin- 

 drical and three-cornered, angles sometimes pro- 

 minent, sometimes obsolete, mouth three-lobed, 

 dentate. — (Plate 2, fig. jo.) 



