THE GENUS PYTHIUM - An-Najah National University
THE GENUS PYTHIUM - An-Najah National University
THE GENUS PYTHIUM - An-Najah National University
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-95% CI.) .urn diam. AN<strong>THE</strong>RIDIA: Mostly monoclinous, occasionally<br />
diciinous,I(-2)/oogonium, clubshaped. OOSPORES:Aplerotic, 15-18(av. 15.5±<br />
0.4- 95% Cl.) ..urn diam; ooplast 7-10 (av. 8) .urn diam. TEMPERATURE-<br />
GROWTH RELATIONSHIPS:Minimum 5°C, optimum 25°C, maximum 300C.<br />
Daily growth rate on CMA at 25 C OI5.6mm.<br />
MATERIAL EXAMINED: ex stream bed, Nablus (FCCAU 144.2).<br />
OCCURRENCE:Isolated only once from stream bed near Nablus.<br />
<strong>PYTHIUM</strong> OLIGANDRUMDrechsler, J. Wash Acad. Sci. 20:409(1930) Figs.<br />
91-94<br />
COLONY MORPHOLOGY: Colonies on CMA show no special pattern; no<br />
development of aerial mycelium. MYCELIUM: Main hyphae 3-6 (av. 4»).Im<br />
wide. SPORANGIA: Terminal or intercalary, consisting of complexes of<br />
subglobose elements connected together with filamentous parts, 18-35 (av,2.5)<br />
...urndiam. Zoospores formed at 1O-20oC OOGONIA: Terminal or intercalary,<br />
globose, 15-26 (av.20.8± 0.8-95% C.I.)...um diam, provided with conical pointed<br />
projections, 5-11 (av. lO)pm long. AN<strong>THE</strong>RIDIA: Mostly lacking, diclinous or<br />
occasionally monoclinous, antheridial cells often applied lengthwise closely to<br />
the oogonium, sometimes lobulated or constricted. OOSPORES: Aplerotic<br />
(oospore volume/oogonium volume=0.70), 13-20 (av. 18.5± 0.6-95% C.l.Lum<br />
diam, wall 1-2 (av. 1.7± -95% C.I.)...um thick, ooplast 6-13 (av.9.8)...um diam.<br />
TEMPERATURE-GROWTH RELATIONSHIPS: Minimum 1
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