Illustration from 1911 Encyclopædia Britannica, article BRYOPHYTA.

Original caption: FIG. 9.—Cephalozia bicuspidata. Longitudinal section of the summit of a shoot bearing a nearly mature sporogonium, sg, still enclosed in the calyptra; ar′, archegonia which have remained unfertilized; st, stem; b, leaf; p, perianth. (After Hofmeister.)

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