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PLATE 51
Ectocarpus socialis S. and G.
Fig. 12. Small group of plants showing rhizoids, a few cells with chro-
matophores, and the positions and shapes of the zoosporangia. X 125.
Fig. 13. Selection of parts of filaments showing the positions and relative
shapes and sizes of the gametangia. X 125.
Ectocarpus cylindricus f. codiopliilus S. and G.
Fig. 14. Group of young plants showing both zoosporangia and game-
tangia, the two parts of ramuli on the left representing these organs on the
same plant. X 60.
Ectocarpus Taoniae S. and G.
Fig. 15. Portion of a creeping filament showing erect filaments and the
positions and relative shapes and sizes of the gametangia on both the creeping
and the erect filaments. X 250.
Ectocarpus affinis S. and G.
Fig. 16. Diagrammatic representation of a small group of plants on their host.
Fig. 17. Portions of filaments illustrating positions, relative shapes and
sizes of gametangia. X 225.
This plate is a reprint of Setchell and Gardner, Univ. Calif. Publ. Bot., vol. 7,
p. 420, pi. 46, 1922.
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