These have an entirely leafless, fleshy, flat, and
irregularly-shaped thallus. In its intercellular chambers
Nostoc-colonies are often found, which have forced their way
through the stomata situated on the under side. The antheridia
and archegonia arise from the cells lying inside the thallus.
The capsule resembles a long, thin pod; it has two valves and a
columella. _Anthoceros_ (_A. lævis_, Fig. 194, and _punctatus_).