植物学雑誌
Online ISSN : 2185-3835
Print ISSN : 0006-808X
ISSN-L : 0006-808X
The Thallus Structure and the Reproductive System of Hyalosiphonia caespitosa (Cryponemiales, Rhodophyta)
MITSUO CHIHARAMAKOTO YOSHIZAKI
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1971 年 84 巻 995 号 p. 319-325

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Detailed morphological studies were carried out on the vegetative thallus and female, and tetrasporangiate systems of the red alga, Hyalosiphonia caespitosa Okamura (family Dumontiaceae). As a result, the following data were obtained : 1) each segment cell produces four vegetative laterals, of which the distal ends form a tight cortex, 2) basal cells of the cortex bear a carpogonial branch and an auxiliary cell branch separately, 3) both carpogonial branch and auxiliary cell branch are strongly curved and 4) after fertilization, the carpogonium fuses with a cell of a carpogonial branch and they form a fused area from which develops a connecting filament which ultimately fuses with the auxiliary cell. These features support well the systematic position of
the genus Hyalosiphonia as a taxon of the Dumontiaceae.

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© The Botanical Society of Japan
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