Pleomorphism in Selected Genera of Algae Page: 15
vi, 79 leaves : ill.View a full description of this thesis.
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15
reduction of fifteen taxa in five genera to ecophenes (eco-
logical variants) of Microcoleus vaqinatus (35) and 54 taxa
in 9 genera to ecophenes of Schizothrix calcicola (36).
Foerster (40), in working with Oscillatoria limosa (Roth) Ag.,
found that by increasing the concentration of calcium or mag-
nesium, sheath formation was induced, necridia formation was
increased, and basal attachment of filaments was initiated.
Morphological variations in Tolypothrix have been reported by
Stein (93), who found that variation in nutrients affected
form, sheath, heterocyst production, false branching, and
might account for discrepancies present in differentiation of
Tolypothrix and Scytonema.
Pearson and Kingsbury (76) have reported the appearance-
dissappearance and wide variation in taxonomic characteristics
in several blue-green algae. Depending on culturing conditions,
they observed variations in color, hair formation, cell diam-
eter, heterocyst, akinete and pseudovacuole formation and
shape, shape of terminal cells, constriction at crosswalls,
trichome arrangement, and sheath characteristics within given
species of Anabaena, Calothrix, and Lyngbya.
Several factors led to the choice of "Pleomorphism in
Selected Genera of Algae" as the subject of this thesis problem.
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Bruton, Barbara A. Pleomorphism in Selected Genera of Algae, thesis, June 1967; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc163903/m1/21/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .