Culture Study of the Red Alga Polysiphonia senticulosa Harvey (Ceramiales, Rhodophyta)

概要

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Life history and morphological development of Polysiphonia senticulosa Harvey (Ceramiales, Rhodophyta) were investigated by culture experiment. Morphological stability and plasticity were assessed in several features. The following features are confirmed as morphological stability of this species. (1) Thallus is composed of slender upright axes, and intricately entangled prostrate axes. (2) Thallus produces adventitious branches on the lowermost portion of the main axis. (3) Thallus is ecorticated with four periaxial cells. (4) Rhizoids are formed without septation. (5) Thallus is soft and flaccid in texture. (6) Determinate branches have sharply pointed apices. (7) One to three axillary branchlets are formed. (8) Tetrasporangia are formed in a straight line, on the last two orders of ordinary branchlets and on axillary branchlets. (9) Carpogonial branch is composed of four cells. (10) Cystocarps are urceolate in shape. (11) Spermatangial branchlets are formed replacing the whole trichoblasts and their shape is terete to cylindrical with sterile tips. These features are appropriate for the taxonomic criteria in P. senticulosa.
札幌大学の論文
2000-03-21