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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<strong>PYTHIUM</strong> PULCHRUM Minden, Mykol. UntersBer. 1:277(1916). Figs. 89-<br />
90.<br />
COLONY MORPHOLOGY: Colonies on CMA showing an indistinct<br />
chrysanthemum pattern; no development of aerial mycelium. MYCELIUM:<br />
Main hyphae 3-5 (av. 4.2) urn wide. SPORANGIA: Globose, ellipsoidal,<br />
occasionally catenulate up to 3 in a chain, 20-41 (av. 30).um diam, zoospores<br />
produced at 1O-2dC. OOGONIA: Mostly intercalary, occasionally terminal up<br />
to 5 in a series, smooth, 18-37 (av. 23.4± 1.2-95% c.I.) urn diam.<br />
AN<strong>THE</strong>RIDIA: 1-2(-3)/oogonium, mostly hypogynous. occasionally monoclinous<br />
or diclinous. OOSPORES: Aplerotic, 16-29 (av. 19.4± 0.7-95% c.I.).um diam,<br />
ooplast 9-13 (av. 1O.5)umdiam. TEMPERATURE-GROWTH RELATIONSHIPS:<br />
Minimum 5 0C, optimum 25 0C, maximum 30oC. Daily growth rate on CMA at<br />
25 0C 17mm.<br />
MATERIAL EXAMINED: ex Malva sp, Nablus (FCCAU 129.3), Monistera<br />
deliciosa, Qalqilyeh (FCCAU 129.4), ex soil, Gaza (FCCAU 129.1), and several<br />
other isolates.<br />
OCCURRENCE: Infrequently isolated from diseased roots, and seldom<br />
present in soil (found in 30% of the soils sampled). This species was also<br />
recorded from Iraq (Al-Doory et al. , 1959).<br />
<strong>PYTHIUM</strong> PYRILOBUM Vaartaja, Mycologia 57:425 (1965).<br />
OCCURRENCE: Infrequently isolated from diseased roots, and rarely form<br />
soil (found in 3% of the soils sampled).<br />
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