Pleomorphism in Selected Genera of Algae Page: 11
vi, 79 leaves : ill.View a full description of this thesis.
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11
media. When nutrients occur in optimal quantities, the
organism undergoes rapid division and assumes a Chlamvdo-
monas-like character lacking red pigment and. inflation of
cell wall. Pringsheim notes that populations of Sphaerellopsis
hyalina (81, 82), Chlamydoblepharis (82), members of Phaco-
taceae and Lobomonas sphaeria (83) , as well as Haematococcus,
do not show features characteristic of the taxa under optimal
growing conditions.
Variation in degree of radial symmetry has been reported
(110, 111, 65, 67, 88, 92, 116) in several species of Cosmarium.
The triradiate forms of Cosmarium botrytis have been studied
by Waris (106, 107), who attributed their occurrence to the
"formation of an atypical cytoplasmic framework" which developed
in conjunction with "the first vegetative division of a ju-
venile cell." Brandham and Godward (12) found that the tri-
radiate cells were sometimes formed as the product of germi-
nating zygospores, but the degree of symmetry did not seem
to be affected by the old semicell. Brandham and Godward (12)
found that although the triradiate form was sexually fertile,
the character was not transmitted sexually but was most likely
attributable to temperature effects.
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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/m1/17/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .