Graduate Thesis Or Dissertation
 

Development, reproductive morphology, and cytology of Pelvetiopsis limitata (Setchell) Gardner (Phaeophyta, Fucales)

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  • Pelvetiopsis limitata (Setchell) Gardner (Phaeophyta, Fucales), collected on the central Oregon coast, was studied by electron microscopy, and by light microscopy using methacrylate embedding and toluidine blue, acid fuchsin, PAS and anilin blue staining. The sperm of both P. limitata and Pelvetia fastigiata (J. Agardh) DeToni (from northern California) are typically fucacean, with a banded proboscis and two flagella, the shorter of which is anterior and bears mastigonemes. Apical growth in Pelvetiopsis limitata is the product of a group of initials. Conceptacle development involves the formation of two tongue cells from the conceptacle initial. When zygotes are cultured in sterile-filtered sea water at 15 C and 2000 lux light intensity, both Pelvetiopsis limitata and Pelvetia fastigiata exhibit Fucuslike embryology amd form embryonic apical hairs, although this is delayed several weeks in P. limitata relative to P. fas tigiata or Fucus. Continuous light causes developmental abnormalities in P. limitata. Pelvetia fastigiata is found to be so different from the European Pelvetia canaliculata Dcne. et Thuret that consideration of their generic segre gation is suggested.
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