THE GENUS PYTHIUM - An-Najah National University

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Figs. 65-72. Pythium mamillatum. (65) habit showing hyphae and sporangia. (66;70-72) oogonia with antheridia. (67) oogonium and empty sporangium. (68,69) sporangia. (BarsetO .um), 40
PYTHIUM MIDDLETON II Sparrow, Aquatic Phycomycetes(Univ. of Mitch. Press), p.1038(1960). COLONY MORPHOLOGY:Colonies on CMA forming chrysanthemum pattern with no aerial mycelium. MYCELIUM:Main hyphae 3-8(av. 4).um wide. SPORANGIA: Globose, ovoid, proliferating internally, (25-50)x(21-38) (av. 38 x 35) urn diam. emmision tubes short, zoospores formed at 10-20 C. OOGONIA: Mostly intercalary, occasionally terminal, subglobose, 15-30(av. 22.8± 1.1-95% C.I.) ..urn diam. ANTHERIDIA:Monoclinous, stalked or commonly sessile, diclinous and hypogynous; mostly 1/ oogonium. OOSPORES: Aplerotic, 14-25(av.19.0± 0.9 -95% c.1.)..um diam, wall 1-2 (av. I.4± 0.2 -95% c.1.)..um thick; ooplast 6-15(av,IO.3)..um diam. TEMPERATURE - GROWTH RELATIONSHIPS: Minimum IOoC, optimum 250C, maximum 30°C. Daily growth rate on CMA at 25°C 1O.lmm. MATERIAL EXAMINED: ex Diospyros kaki L.,Tulkarem(FCCA U II 1.8) and lens culinaris Medik, Tubas(FCCA U 111.9);ex soil, Nablus(FCCA U 111.1);ex stream water, Nablus(FCCAU 111.10), and several other isolates. OCCURRENCE: Infrequently isolated from diseased roots, seldom present in soil (found in 24% of the soils studied) and also infrequently isolated from stream water. This species was also recorded from damped-off soyabeans in Egypt (EI-Helaly et al., 1972) and from diseased roots of avocado in Israel{Pinkas et al. 1981) PYTHIUM MINOR Ali-Shtayeh, Bot. J. Lin. Soc. 91:297-317{l985). OCCURRENCE:Seldom present in soil (found in 27% of the soils sampled), and also found in stream water. 41
Page 1 and 2: THE GENUS PYTHIUM In the West Bank
Page 3 and 4: PREFACE This monograph is aimed at
Page 5 and 6: SUMMARY A key to the 48 taxa of Pyt
Page 7 and 8: Pythium species such as P. periploc
Page 9 and 10: II. MATERIALS AND METHODS A. Isolat
Page 11 and 12: Microscopic examination: Microscopi
Page 13 and 14: Growth rate and temperature limits
Page 15 and 16: 9(4) 10(9) 11(10) 12(11) 13(12) 14(
Page 17 and 18: 29(28) 30(29) 31(30) 32(31) 33(28)
Page 19 and 20: 46(45) 47(1) 48(47) 49(48) 50(48) 5
Page 21 and 22: Figs. 2-7 Pythium acanthicum. (2,3)
Page 23 and 24: Figs. 8-11. Pythium anandrumn. Spor
Page 25 and 26: Figs. 16-19. Pythiurn anandrurn. Oo
Page 27 and 28: Figs. 20-23. Pythium aphanidermatum
Page 29 and 30: Figs. 24-29. (24-26) Pvthium c%rotu
Page 31 and 32: Figs. 30-35. (30-33) Pythium debary
Page 33 and 34: Figs. 36-41. Pythium dissimile. (36
Page 35 and 36: Figs. 42-47. Pythium dissotocum. (4
Page 37 and 38: Figs. 48-54. Pythium echinulatum. (
Page 39 and 40: Figs. 55-59. Pvthium graminicola. (
Page 41 and 42: MATERIAL EXAMINED: ex Vitia fabae,
Page 43: PYTHIUM LrTARIL:\l Ali - Shtaveh, B
Page 47 and 48: PYTHIUM MONOSPERMUM Pringsh., Jb. w
Page 49 and 50: Figs. 85-90. (85) Pythium nagaii, o
Page 51 and 52: Figs. 91-94. Pythium oligandrum.(91
Page 53 and 54: Figs. 95-100. Pythium papillaturn.
Page 55 and 56: PYTHIUM PULCHRUM Minden, Mykol. Unt
Page 57 and 58: Figs. 101-108. (101-103) Pythium ro
Page 59 and 60: Figs. 109-114. Pythium salpingophor
Page 61 and 62: FIgs. 115-120. (115) Pythium sylvat
Page 63 and 64: Figs. 121-126. Pythium torulosum. (
Page 65 and 66: MATERIAL EXAMINED: ex Brassica oler
Page 67 and 68: Figs. 127-131. Pyihium vanterpoolii
Page 69 and 70: Figs. 132-136. Pythium vexans. (132
Page 71 and 72: V.HOST LIST A list of the vascular
Page 73 and 74: VI REFERENCES Agrios, G.N. 1978. Pl
Page 75 and 76: Garrett, 195 I. Ecological groups o
Page 77 and 78: Reichert, I. 1939. Palestine: Disea
Page 79 and 80: VII. INDEX OF FUNGAL NAMES Fusarium
Page 81: ~I ~) ~IJ ~~I Pythium JI t'.~~~ 61:

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