Introduction Hypnea Lamouroux is a widespread red alga on tropical and subtropical shores. Its asexual phase reproduces by zonately divided tetrasporangia which are borne at the bases of specialized fertile branchlets, the Stichidia (Fritsch 1945, Isaac and Hewitt 1953, Tanaka 1941). Dawson etal (1964) believed that the stichidial branchlets are determinate, implying that they are incapable of continued vegetative development. However, there appears to have been no attempt to prove this belief. The purpose of this note has been to provide additional evidence which would substantiate or disprove this supposition. Materials and Methods At the end of the cultural period the thalli were fixed in formalin and later their stichidial branchJets were examined and compared with those of the original samples fixed in formalin. This was done using a Zeiss compound microscope. Photomicrographs of the observed structures were taken with a Minolta SRT 101 camera and microscope adaptor. Results It was observed that after liberating their spores, the Stichidia undergo active growth and transform into normal vegetative branchlets- Even in unshaken cultures where some of the tetraspores germinated and started their development within the bases of the Stichidia (Figs. l and 2), there was a simultaneous vegetative development
Botanica Marina – de Gruyter
Published: Jan 1, 1976
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