FIG. 93. Two common liverworts : to the left is Conocephalus, a Marchantia form, 

 showing rhizoids, dichotomous branching, and the conspicuous rhombic areas 

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

 and pod-like sporogonia. CALDWELL. 



rid 



FIG. 94. 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 (J), also chlorophyll tissue (chl) 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 ($) and containing short, 

 often branching filaments whose cells contain chloroplasts (chl), overarching 

 upper epidermis (o) pierced by a large chimney-like air-pore (sp). After GOEBEI-. 



