Pleomorphism in Selected Genera of Algae Page: 56
vi, 79 leaves : ill.View a full description of this thesis.
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56
autospore formation during which the cells enlarge, thus
causing a reduction in degree of angularity and extent of
spine protrusion. This was accompanied by the breakdown of
pyrenoids (1, 2, 3, 22). Zoospores were observed as indi-
cated by Starr (23).
A- falcatus exhibited little variation in cell shape,
although occasional aberrant cells were noted in deficient
medium. In microelement deficient BBM, cells were reduced in
size and apices were long and attenuated. Other investi-
gators (17, 20, 27) have noted changes in cellular charac-
teristics in the absence of microelements. When cultured
in potassium dihydrogen phosphate deficient BBM, cells de-
veloped long, thread-like appendages similar to those described
by previous investigators (25, 27). These filaments or
bristles (25) formed connections between cells and appeared
to be associated with separation of autospores after the
division of the parent cell. Apical secretions- (16) were
also observed. When grown in ammonium nitrate, magnesium
sulfate, or sodium chloride deficient BBM, cells were gray
and autospore formation was not observed. Several investi-
gators have shown that magnesium and nitrogen are essential
for chlorophyll formation (10, 13) and autospore formation
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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/m1/62/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .