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ALGAE > Volume 7(1); 1992 > Article
ALGAE 1992;7(1): 1-6.
Reproduction and Life History of Antithamnion secundum Itono (Ceramiaceae, Rhodophyta)
Kim Gwang Hoon, In Kyu Lee
Department of Biology, seoul National University
ABSTRACT
Antithamnion secundum Itono was collected for the first time in Korea. The morphology and reproductive structures were investigated with investigated with the field and laboratory cultured plants. Thalli were delicate, strongly prostrate and branched decussately in one plane. The indeterminate branches formed in the primary and secondary systems of growth had opposite whorl-branchlets which bore regular pectinate adaxial branchlets. Spermatangial culsters developed adaxially on whorl-branchlets in middle to upper portion of the thallus. Procarps occurred successively in pairs on the basal cells of whorl-branchlets in upper segments of main axes. After fertilization a connecting cell was commonly formed between the carpogonium and the auxiliary cell. Tetrasporangia were oblong pedicellate and cruciately divided on whorl-branchlets. A Plolsiponia-type life history was usually exhibited although some female plants developed tetrasporangia in addition.
Key words: Antithamnion secundum, taxonomy, reproduction, life history, Rhodophyta


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