Abstract
The leafy thalli of species of the marine red algal genus Porphyra grow rapidly but persist for a relatively short time on rocky intertidal or subtidal substrata or as epiphytes on other marine plants. In most species, the large, short-lived leafy thalli alternate with small, presumably perennial, filamentous ‘conchocelis’ plants. Depending on the species of northeastern Pacific Porphyra, photoperiod and temperature are important regulators of conchospore formation and release. Data from laboratory studies of conchospore formation and release in five Washington species of Porphyra (P. abottae, P. nereocystis, P. perforata, P. pseudolanceolata and P. torta) indicate that conchospores are most likely to be released at a time that precedes the appearance of the leafy thalli in the field.
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Waaland, J.R., Dickson, L.G. & Duffield, E.C.S. Conchospore production and seasonal occurrence of some Porphyra species (Bangiales, Rhodophyta) in Washington State. Hydrobiologia 204, 453–459 (1990). https://doi.org/10.1007/BF00040270
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DOI: https://doi.org/10.1007/BF00040270