Am. Khallil et al., MONTHLY VARIATIONS OF OOMYCETES (ZOOSPORIC FUNGI) AND AQUATIC HYPHOMYCETES AT SOHAG (UPPER EGYPT), Acta Societatis Botanicorum Poloniae, 62(1-2), 1993, pp. 67-73
Fifty-eight fungal species related to twenty-six genera of Perenospora
les and Saprolegniales (32 species, 7 genera, 671 colonies) and aquati
c Hyphomycetes (26 species; 19,genera; 1038 colonies) were recovered f
rom the surface water (zoosporic fungi) and submerged decaying leaves
(aquatic Hyphomycetes) samples collected monthly (10 samples each mont
h) during the period of experiment (18 months). The richest samples in
either zoosporic fungi or aquatic Hyphomycetes were those of comparat
ively low or moderate temperature, high contents of organic matter and
dissolved oxygen. The pH value and the total soluble salts did not sh
ow any regular monthly variations and did not exhibit any considerable
influence on fungal population. Achlya racemosa, Dictyuchus sterile (
Saprolegniales) and Alatospora acuminata, Trisclophorus monosporus (aq
uatic Hyphomycetes) were the most prevalent species. Some fungal speci
es showed their highest population in winter months whereas others in
summer months. Moreover, some species were recovered throughout the ye
ar. One species of Saprolegmiales (Isoachlya toruloides) and three spe
cies of aquatic Hyphomycetes (Exophiala jeanselmei, Flabellospora Sp.
and Varicosporium delicatum) are new records to Egypt.