230 



HANDBOOK OK BRITISH HEPATICyE. 



colour, simple or proliferous. Stolons long, 

 branched, bearing white hair-like rootlets. Inno- 

 vations numerous, from the axils of the amphi- 

 gastria, or rarely from involucral bracts. Leaves 

 smaller at the base, terminal more crowded and 

 larger, imbricating regularly (fig. 156), erect, ad- 

 pressed, plane or slightly con- 

 cave, orbiculate to reniform, entire, 

 submarginate, at right angles or 

 oblique, dorsal margin decurrent, 

 ventral rounded at the base (fig. 

 157); pale green below, or 

 yellowish - brown, purplish or 

 maroon in upper portion. Amphi- 

 gastria ovate, subulate. Dioicous. 

 Fertile stems thickened above. 

 Involucral leaves terminal, two or 

 three pairs, larger and more reni- 

 form, terminal pair compressed. 

 Involucral amphigastria ovate, ir- 

 Perianth immersed, at first entire, 

 at length quadripartite. Capsule dark brown, on 

 short pedicel. Spores reddish-brown. Male shoots 

 slender. Perigonial leaves terminal, enclosing two 

 to three olive antheridia. 



156. 157. 

 regularly lobed. 



Nardia hyalina, Lydl, Dum. 



Stem creeping, almost simple; leaves erect, 

 spreading, imbricate, rounded, somewhat 

 undulate, entire ; stipules none ; perianth ter- 

 minal, ovate ; apex angular, mouth quadrifid. 



J iingermannia hyalina, Lyell, Hook, Br. 

 Jung. No. 63; Gott. and Rab. Exs. No. 189, 



