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> ANANDRUM Drechsler J. Wash. A cad. Sci. 20:410 (1930) Figs<br />
8-19<br />
COLONY MORPHOLOGY: Colonies on CMA forming a radiate pattern<br />
with scanty aerial mycelium. SPORANGIA: Terminal, elongate (35-50)X(25-35)<br />
avo 41X30.um diam, usually papillate, proliferating. Zoosperes formed at room<br />
temperature, discharge tubes short up to Ifl um long; zoospores rarely forming<br />
and germinating within the sporangium. OOGONIA: Terminal, globose, 23-29<br />
(av. 26.5 ± 0.8-95% C.l.) .um diam, ornamented with conical pointed spines,<br />
3-11 (av. 2.5).urn long. AN<strong>THE</strong>RIDIA: Lacking. OOSPORES: Aplerotic 20-25<br />
(av. 22.9 ± 0.6-95% c.!.) urn thick. Ooplast 12-17 (av. 14) .um,<br />
TEMPERATURE-GROWTH RELATIONSHIPS: Minimum 50 C, optimum<br />
20-250 C, maximum 300C. Daily growth rate on CMA at 250C 18mm diam.<br />
MATERIAL EXAMINED: ex :Lantana sp, Nablus (FCCAU 139.1); ex<br />
stream water, Til-Nablus (FCCAU 139.2); and ex stream bed, Nablus (FCCAU<br />
139.3).<br />
OCCURRENCE: Infrequently isolated from diseased roots, stream water, and<br />
. stream bed.<br />
18
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