Illustration from 1911 Encyclopædia Britannica, article BRYOPHYTA.

Original caption: FIG. 1.—Archegonia of Marchantia polymorpha. (After Sachs.)

1. Mature but unopened archegonium. e, Ovum; b, ventral-canal cell; d, lid-cells of neck.

2. Archegonium ready for fertilization; a passage leads down to the rounded ovum e.

3. Archegonium after fertilization; the fertilized ovum is developing into a sporogonium f; d, perianth.

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