62 



HANMiOOK OF 15RITISH HEPATIC/E. 



or ligulate, margin recurved and entire (fig. 43). 

 Cal) r x ovate, compressed and flat, then erect, cylin- 

 drical, mouth truncate, serrate, deep notch on one 

 side, half its length (figs. 44, 45). Capsule pale 

 yellow brown. Elaters bispiral. — {Plate 2, fig. 18.) 



Porella rivularis, N. 



Branches simply pinnate, leaves entire, 

 ovate, obtuse, decurved, shortly auriculate, 

 auricule sometimes discrete, stipules semi- 

 lunate, decurrent. Perianth two-lipped, mouth 

 crenate. 



Madothcca rivularis, Nees Eur. Leb. 3, p. 

 196; Gott. and Rab. Exs. No. 371 ; Cooke 

 Hep. f. 142. Porella rivularis, Carr. and 

 Pears. Exs. 131. 



On stones in streams. 



Tufts wide, loose, dark green, the younger 

 shoots of a lively green. 

 Stern, 1 to 2 inches long, 

 irregularly branched, scarcely 

 pinnate, branches short, patent. 

 Leaves oblong-rounded, some- 

 times a little narrower at the 

 top, quite entire (fig. 46), their 

 structure densely and minutely 

 cellular. The lower lobe is 

 more minute, in proportion to 

 the upper, than in any of its 

 congeners, the stipules are 



scarcely wider than the stem. — Taylor. {Plate 2, 



fig. 19.) 



46. 



