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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MATERIAL EXAMINED: ex Lens culinaris Medik, Jenin (FCAAU 132.4,<br />
antheridial); ex soil, Nablus (FCCAU 132.1; FCCAU 132.2, FCCAU 132.3,<br />
oogonial).<br />
OCCURRENCE: Infrequently isolated from diseased roots, and rarely from<br />
soil (found in one soil).<br />
<strong>PYTHIUM</strong> TORULOSUM Coker & Paterson, J. Elisha Mitchell scient.<br />
Soc.42:247. Figs 121-126<br />
COLONY MORPHOLOGY: Colonies on CMA showing rosette pattern; no<br />
development of aerial mycelium. MYCELIUM: Main hyphae 3-5(av. 3.5»).lm<br />
wide. SPORANGIA: Consisting of toruliod inflated branched elements,<br />
zoospores formed at 10-20"C. OOGONIA: Terminal, sometimes intercalary,<br />
smooth, 14-19(av. IS.6± 0.5-95% C.!.) .um diam. AN<strong>THE</strong>RIDIA: 1-2(-<br />
3)/ oogonium, monoclinous originating at a distance of I-S(-12) urn from the.<br />
oognium base, occasionally diclinous. OOSPORES: Plerotic, 13.5-17.5(av.<br />
IS.I± 0.S-9S% C.I.)..um diam, wall 1-1.5 (av. l.l± 0.1-9S% C.I.)..um thick.<br />
ooplast 6-IO(av. 7.4»).lmdiam. TEMPERATURE-GROWTH RELATIONSHIPS:<br />
Minimum S·C, optimum 30' C, maximum 3l C. Daily growth rate on CMA at<br />
25"C 9.7mm.<br />
MATERIAL EXAMINED: ex Dianthus caryophyllus L., Nablus (FCCAU<br />
133.1; FCCAU 133.2; FCCAU 133.3).<br />
OCCURENCE: This species was isolated only from diseased roots of<br />
Dianthus caryophyllus L. It was also recorded from soil in the Lebanon<br />
(Ahrens, 1971).<br />
58
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