Introduction to Fungi, Third Edition

UREDINIOMYCETE YEASTS
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Fig 24.6 Sporidiobolus salmonicolor.
(a) Budding cell. (b) Cell with
sterigmata. (c) Conjugation of
haploid cells and initiation of a
dikaryotic hypha. (d) Young
dikaryotic hyphae, the original
conjugants obscured.The arrow
indicates the first clamp
connection. (e) Late stage of
chlamydospore development;
the paired nuclei are visible.
After Bandoni et al.(1971).
and Rhodotorula spp. appear to be associated with
lesions caused by plant pathogens such as rust
fungi, or by parasites such as nematodes.
Ballistoconidia of Sporobolomyces are frequent
in the air, especially during warm summer
nights, and concentrations of these spores
may reach values of up to 10 6 m 3 (Gregory &
Sreeramulu, 1958). Such high concentrations are
a cause for concern because Sporobolomyces has
been shown to be a respiratory allergen (Evans,
1965).
Phylloplane yeast populations occupy an
exposed habitat and are therefore susceptible
to environmental changes. Sporobolomyces roseus
has been proposed as an indicator of air quality,
low colony counts correlating with heavy air
pollution (Dowding & Richardson, 1990). The
results can be superimposed on those obtainable