Illustration from 1911 Encyclopædia Britannica, article BRYOPHYTA.

Original caption: FIG. 13.—Sphagnum acutifolium. (After Schimper.)

A. Longitudinal section of apex of a bud bearing archegonia (ar), enclosed by the large leaves (y); ch, small perichaetial leaves.

B. Longitudinal section of the sporogonium borne on the pseudopodium (ps); c, calyptra; ar, neck of archegonium; sg′, foot; sg, capsule.

C. S. squarrosum. Ripe sporogonium raised on the pseudopodium (qs) above the enclosing leaves (ch); c, the ruptured calyptra; sg, capsule; d, operculum.

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