Fig. 282. Two common liverworts : to the left is Conocephalus, a Marchantia form, 

 showing rhizoids, dichotomous branching, and the conspicuous rhombic areas 

 (areolae) on the dorsal surface; to the right is Anthoceros, with its simple thallus 

 and pod-like sporogonia.— Goldberger. 



Fig. 283. Cross-sections of thallus of Marchantia: A, section from thicker part of 

 thallus, where supporting tissue (p) is abundant, and showing lower epidermis 

 giving rise to rhizoids {h) and plates (&), also chlorophyll tissue ichl) organized 

 into chambers by partitions (o)\ B, section near margin of thallus more magnified, 

 showing lower epidermis, two layers of supporting tissue {p) with reticulate walls, 

 a single chlorophyll chamber with its bounding walls {s) and containing short, 

 often brandling filaments whose cells contain chloroplasts {cJil), overarching 

 upper epidermis (o) pierced by a large chimney-like air-pore (sj»).— After Goebel. 



