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 Ant/toceros, with its simple thallus 
and pod-like sporogonia. GOLDBERGER. 
hi 
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 (J), also chlorophyll tissue (eld) organized 
into chambers by partitions (o); J?, 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 branching filaments whose cells contain chloroplasts (c/il), overarching 
upper epidermis (0) pierced by a large chimney-like air-pore (sp). After GOEBEL. 
