The life history of Phaeosaccion collinsii Farlow, a species which is known from a single locality in Nova Scotia, has been completed in culture. There was no indication of a sexual phase and zoospores gave rise directly to the tubular thallus. Completion of the life history occurred at 5 °C only. At higher temperatures spores failed to germinate, or growth and differentiation were suppressed. Light intensities exceeding 100 ft-c inhibited spore germination, although growth and differentiation were not similarly affected. In nature mature plants occur sublittorally, and are present only in spring when the water temperature is around 5 °C. Zoospore flagellation is of the typical heterokont type with the flimmer bearing bilateral hairs. On this basis P. collinsii can be placed either in the Chrysophyceae or Phaeophyceae.
1971. Pigments, polysaccharides, and photosynthetic products of Phaeosaccion colli~rsii. Can. J. Bot. 49: 1067-1074. Zoospores of Phaeosaccion collinsii averaged 70 p3 and contained total N 2.24 pg, DNA 0.19, and chlorophyll a 0.62 pg per spore. In addition, chl c, "cis"-8-carotene, fucoxanthin, and violaxanthin were principal pigments and a minor unidentified carotene was present.Photosynthetic rates of zoospores were 0.37 X 10-l2g C per spore per hour, or 0.59 mg C per mg chl a per hour at 5". The principal products of photosynthesis were mamitol and a water-soluble glucan.Carbohydrates in the thalli were fractionated and evidence is presented for the presence of a laminarinlike glucan, mamitol, tnyo-and scyllo-inositols. Alginate was absent.The relationship of P. colli~uii to other algal groups is discussed and it is concluded that its affinities lie with the Chrysophyceae.
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