254 HANDBOOK OF BRITISH HEPATIC^. 



inches long, procumbent, oblong, once, twice, or 

 thrice branched dichotomously, branches spreading, 

 the whole plant more or less waved and undulated, 

 especially at the margins, which are quite entire 

 (fig. 175). Substance delicate, nerve scarcely 

 differing except in thickness from the rest of the 

 frond. Colour pale green. Perigonial scales few on 

 the nerve, closely ad pressed, ovate, convex, margins 

 slightly toothed. Calyx double, exterior one short, 

 cut nearly to the base in lanceolate laciniae, which 



175- 176- 



are themselves toothed. Interior more delicate, 

 paler, three times as long, nearly cylindrical, cut 

 down on one side, slightly toothed (fig. 176). 

 Capsule oblong-ovate. Elaters bispiral. 



As to the differences between this and Blyttia 

 Lyellii, Gottsche remarks that the former " has no 

 nerve, the latter has a nerve. In the former all 

 the cells are alike, and no midrib with ligneous 

 fibres is present." 



GENUS 38. BLASIA, Mich. 

 Involucre undivided, bladdery, adnate to 



