II 



MUSCINE^—HEPA TICAl—MARCHANTIA CEA£ 



23 



in large numbers in the so-called chlorophyll-bearing layer, just 

 below the dorsal epidermis. This chlorophyll -bearing layer 



Fig. I.— Marchantiace^. A, B, Male plants of Fiiiibriaria Callforiiica (Hampe). A, from above ; 

 B, from below ; c5i antheridial receptacle; /, ventral lamella, X4; C, Riccta glaiica (h.), X6; 

 sp, sporogonia; D, Cotiocephalus conicus (Corda), X4 ; E, Targionia hypophylla. (L.), X2 ; i, 

 antheridial branch. 



contains air-spaces in all forms except some species of 

 Dumortiera, and these spaces are either simple narrow canals, 



