54 HANDBOOK OF BRITISH HEPATIC^E. 



On rocks, over which water constantly trickles. 



Dioicous. Patches wide, shallow, brownish-olive. 

 Stems i to 4 inches long, ir- 

 regularly pinnate (fig. 39). 

 The branches nearly at right 

 angles to the stem. Leaves 

 from a narrow base, flatly 

 cup-shaped ; their lower lobe 

 swelling out at its involution, 

 while their angulate tops lie 

 closely adpressed to the inside 

 39 ' 4 ' of the upper lobe (fig. 40). 



It differs from R. complanata in the smaller and 

 more convex leaves, their olive-brown colour, their 

 lesser lobe not sharply reflected upon the upper, 

 but having a turned base, by the deflected peri- 

 chaetial leaves, by the perigonia occurring usually 

 at the termination of the shoot, and not on proper 

 short lateral branches, and by the angulate portion 

 of the lower lobes of the leaves being shorter. 

 This species prefers very wet surfaces of mural 

 rocks, while R. complanata is partial to trees. 

 Taylor. 



Radula Lindbergh, Gott. 



Dioicous, stems prostrate, subpinnately 

 branched, branches ascending, leaves imbri- 

 cate, ascending, nearly plane, quite entire, 

 superior lobe obovate, rounded, inferior lobe 

 four times smaller, depressed quadrate, angle 

 acute, involucral obovate-elongate ; perianth 

 obovate, compressed, truncate ; male inflores- 





