Fig. 93. Two common liverworts : to the left is Coitocephalus, a Marchantia form, 

 ehowing rhizoids, dichotomous branching, and the conspicuous rhombic areas 

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

 and pod-like sporogonia.^C'ALDWELL. 



Fig. 94. Cross-sections of thallus of .VarcTianfia: 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 tij-~sue (clil) organized 

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

 ehowing lower epidermis, two layers of supporting tissue (jj) with reticulate walls, 

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

 often branching filaments wliosc cells contain chloroplaists (f///), overarching 

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



