77 species and 3 species varieties belonging to 35 genera were isolated during this investigation. Five species namely: Chytriomjves annulus. Rhinocladiella schufzeri, Dactyfella bemicodes, D. aluskana and D. rhoniposporu are new records to Egypt. The composition of water-borne fungi was basically similar to those of the washwater of collected plants (phyllosphere) and plant part. samples (phylloplane). Of the 20 zoosporic fungal species, Saprolegnia ferar and Dictyuchus sterilis were common in water samples ; and Achfvu oligacantha and S.feru.x in washwater (phyllosphere). On glucose and cellulose-CzAPEK's agar the most frequent of the three substrates were the members of Fusarium, Asperyilfus, Cladosporium, Alternaria and Penicilfium. Also many more species such as Alternaria alternata. Cladosporium cfadosporioide.r, Fusarium monifijorme and Stach-vbotrys atra increased their frequency of occurrence and total counts on cellulose agar than was the case on glucose, Some fungal species were isolated only from water samples and not from phyllosphere or phylloplane and vice versa. Also, some fungal species were isolated on glucose and not on cellulose CZAPEK'S agar medium and vice versa. The plant Ceratophyllum demersum exhibited the highest fungal counts while Phrugmites communis exhibited the lowest counts. The water samples richer in fungal genera and species were those which were characterized by relatively high content of dissolved oxygen. pH, temperature and conductivity of collected water samples did not show any regular pattern and did not exhibit any considerable influence on fungal population.
ABDEL-RAOUF M. A. KHALLILWater samples: For the recovery of zoosporic fungi, the water samples were brought to the laboratory in sterile conical flasks (one litere capacity each) containing previously sterilized halves of germinating hemp and sesame seeds (EL-HISSY .and KHALLIL 1989). Five plates were used for each water sample. The seeded plates were incubated at 22 "C. For the determination of fungal population the zoosporic fungal species appearing on one plate were counted as one colony.For the recovery of terrestrial fungi, 1 ml using sterile MENZIESS'S (1957) dipper of each water sample was transferred to a 10 cm sterile petri dish containing about 20 ml of agar medium. Ten plates were used for each sample (glucose was poured onto 5 plates and cehlose-CzAPEK's agar medium onto the other five). Rose Bengal was added as a bacteriostatic agent (SMITH and DAWSON, 1944). The plates were incubated at 28 "C for 2 weeks during which the growing colonies were examined, identified and counted,The plant samples: Freshwater plant samples were collected and brought to the laboratory in clean plastic bags. In order to have the wash water samples, a part of the shoot system (about 10 gm) of each plant sample was placed in a sterile flask (500 ml) which contained 300 ml sterilized distilled water. Flasks were shaken gently in a rotating motion for ten minutes.Isolation of fungi from wash water (phyllosphere): For the recovery...