[Illustration: FIG. 3.--_Pellia epiphylla_.
A, Longitudinal section of thallus at the time of fertilization. an,
Antheridia; ar, archegonia; in, involucre.
B, Longitudinal section of almost mature sporogonium attached to the
thallus. in, Involucre; cal, calyptra; f, foot; s, seta; caps, capsule
(semi-diagrammatic).]
[Illustration: FIG. 2.--_Pellia epiphylla_. Group of plants bearing mature
sporogonia.