HANDBOOK OF BRITISH HEPATIC^. 



61 



leaves large, smooth, greenish yellow. Hook. 

 Br. Jung. t. 40, /. 4. 



Old walls, rocks, and trunks. (Fr. March, April.) 



Grows in considerable patches. Stems i to 2 

 or 3 inches long, flexuose, often pinnate, with 

 straggling branches, 

 which are again 

 shortly branched. 

 Leaves closely im- 

 bricate in two rows, 

 so as to conceal 

 the upper part of the stem 

 (fig. 42), unequally two- 

 lobed, the upper lobe the 

 largest, alternate, ovate, ap- 

 proaching round, slightly 

 concave, margins incurved, 

 entire, or here and there ^ 45- 



slightly toothed, lower lobe strap-shaped, diagonally 

 pressed to the surface of the upper, plane, margins 

 recurved and entire. Colour, deep or blackish 

 green, opaque. Perichaetial leaves like the cauline, 

 but smaller, and the lobule proportionately larger, 

 two to each calyx, stipules adpressed, oblong ovate, 



