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Fig. 24. a, b, Antithamnion percurrens: a , Habit of part of a plant of the type collection, X 13; b, part of a plant 
bearing a tetrasporangium, X 150. c, d, Antithamnion breviramosus var. simplex: c, Habit of part of a plant of the 
type collection, X 68; d, detail of an ultimate forked branch bearing a gland cell, X 300. 
Fig. 25. a-c, Callithamnion marsh allensis: a, Part of a plant of D. 13698a to show branching habit, X 70; b, detail 
of a branch bearing a tetrasporangium, X 162; c, detail of a lower part of a plant showing a catenate holdfast 
branch, X 60. d, Wrangelia anastomosans: Habit of part of a plant of P. 79a, as seen from the lower side, X 3. 
