Fig. 156. Chondrus crispus.

1. Plant with sori (natural size).
2. Segment with sorus.
3. A segment and sorus vertically divided.
4. Seeds or spores.
5. Tetraspores from the sorus (magnified).

This image is from Carrageen in Pereira's Elements of Materia Medica and Therapeutics, 1854.