According to the mode of development of antheridia and antheridial mother cells, the antheridium formation of Rhodymeniales is divided into two types;
I Separate Type; Antheridial mother cells are separate one another. Antheridia and the mother cell are surrounded by the common wall. The superficial gelatinous wall covering antheridial sori disappears during the antheridium formation. Spermatia are comparatively large.
Halosaccion saccatum, H. firmum Rhodymenia palmata and Rh. marfinicrassa
Ⅱ Seriate Type; Antheridial mother cells, originated from the same epidermal cell, are seriate one another with a pit-connection. Antheridia and the mother cell do not have the common wall. The superficial gelatinous wall remains during the antheridium formation. Spermatia are comparatively small.
Rhodymenia intricata, Rh. pertusa, Chrysymenia wrightii, Lomentaria hakodatensis, L. catenata, Binghamia califonica and Champia parvula.
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