Algae. 1996; 11(1): 45-57.

Morphotaxonomic Studies on the Korean Ectocarpaceae (Phaeophyta) IV. Botrytella parvus (Takamatsu) comb. nov., Life History and Morphogenesis Based on Light-Temperature Gradient Culture

Hyung-Seop Kim

Department of Biology, Kangnung National University

Korean plants of brown alga Botrytella were investigated morphologically with field and laboratory cultured materials. The plants were identical with Sorocarpus parvus Takamatsu but clearly distinguished from European B. micromora Bory by the exclusively secunded branches. So, a recombined name B. parvus (Takamatsu) comb. nov. for North East Pacific plants was proposed. From the light-temperature gradient culture, germination pattern and morphogenesis of this species were quitely different depend on culture conditions. Germlings grow more rapidly in higher light and temperature cross conditions. Growth was slow but development was almost same with wild gross morphology in lower temperature at 8℃. In higher temperature from 20℃ to 25℃, germling grow more rapidly but their morphologies were similar with Streblomena species. The germlings repressed to production of the erect axis but enhanced to development of numerous prostrate and rhizoids at higher temperature above 17℃. Korean plants has repeated a direct type of life histrory through plurilocular sporangia under various culture conditions. Sympodial growth was observed in culture but it was irregular as like ramisympodial branches in some red algae, which was weighted a less phylogentic significant, and that it scarcely warrants for establishment of family Sorocarpaceae by the presence of sympodial growth and true hair which occurred in other genera in Ectocarpaceae. The phylogenetic relationships among genera of Ectocarpaceae was discussed based on phenetic morphogenesis and ontogeny.

Keywords : morphotaxonomy, Botrytella parvus (Takamatsu) comb. nov., life history, morphogenesis, light-temperature gradient culture, phylogenetic relationship