Pleomorphism in Selected Genera of Algae Page: 8
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tirolense Hangs, were adult forms of Pediastrum Boryani, and
that Pediastrum integrum var. perforatum Racib. was a devel-
opmental stage between Pediastrum Boryani typicum and Pedi-
astrum integum. Unfortunately, no resume of experimental
data to support these ideas was available. Bigeard (8) noted
the occurrence of spherical colonies of Pediastrum in aging
cultures and related this phenomenon to changes in composition
of media as well as aging. Davis (27), working with Pedias-
trum, correlated the atypical spherical arrangement of
daughter cells of Pediastrum to suboptimal concentrations of
sodium or calcium bicarbonate. He found that concentrations
of sodium or calcium bicarbonate in excess of optimal concen-
trations increased cell division in mother cells resulting in
greater number of cells in daughter colonies. In a more
recent study, Davis (28) noted the occurrence of disoriented
colonies of Pediastrum when the organism was grown in a cul-
ture medium composed of Chu's No. 11 medium and ten per cent
river water or in culture media containing low concentrations
of bicarbonate ion. He correlated this development of abnormal
spherical cells to decreased motility of zoospores.
In studying a green alga found as a palmella stage grow-
ing on moist bark, Livingston (68) observed that this alga
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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/m1/14/?rotate=90: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .