Environmental Engineering Reference
In-Depth Information
FIGURE 8.9
Common genera of green algae, with scale bar length: (A)
Ulothrix,
20
m;
(B)
Chlamadymonas,
10
m; (C)
Pediastrum,
20
m; (D)
Spirogyra,
20
m; (E)
Scenedesmus,
20
m; (F)
Cladophora,
50
m; and (G)
Volvox,
10
m (reproduced with permission from
Prescott, 1982).
Hyphomycetes are divided into the Ingoldian fungi (with branched or ra-
diate conidia) and the helicosporous (with helical conidia) fungi (Alex-
opolus
et al.,
1996). Yeasts (in the group Ascomycetes) can be found in
rivers and lakes, particularly in polluted waters. “Sewage fungus” associ-
ated commonly with organic-rich pollution is actually composed predom-
inantly of sheathed bacteria, not fungi.
Fungi are not abundant in pristine groundwater because of low con-
centrations of organic matter (Madsen and Ghiorse 1993). Likewise, pris-
tine spring water rarely has significant numbers of fungi. Fungi may be lo-
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