THE GENUS PYTHIUM - An-Najah National University

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Figs. 60-64. (60-62) Pythium irregulare, (60) intercalary oogonia and sporangia, (61,62) oogonia with antheridia; 63-64) P. iwayamai, (63) oogonium with antheridiurn, (64) intercalary conidium. (bars, 10 .urn). 38
PYTHIUM LrTARIL:\l Ali - Shtaveh, Boi.:'. Lin. Soc. 91:297-317(1985). OCCURRENCE:This species was originally isolated from soil in England. In this area it was infrequently isolated from diseased roots, and seldom present in soil(found in 24% of soils sampled). PYTHIUM MAMILLATUM Meurs, Wortelrot veroorzaakt door schimmels uit de geslachten Pythium en Aphanomyces, Diss. Univ. Utrecht, p 44(1928) Figs. 65-72 COLONY MORPHOLOGY:Colonies on CMA forming indistinct rosette pattern with development of some aerial mycelium. MYCELlUM:Main hyphae 3-7(av.4.2) ellipsoidal .um wide. SPORANGIA:Terminal and intercalary, globose or 13-30 x 11-27(av. 20.3 x 18.6).um diam; zoospores formed at 1O-20C, • emmision tubes short, up to 5 ..urn long; rarely proliferating inernally. OOGONIA:Terminal or intercalary, globose, 12-22(av.17.9± -95% C.I) urn diam, provided with many projections, 4-9(av. 5.5).um long, projections obtuse, conical and often curved; occasionally smooth oogonia present. ANTHERIDIA: 1-2/ oogonium, mostly monoclinous and originating at a distance from oogonium base, rarely sessile arrising just below oogonium base, occasionally diclinous; antheridial stalks rarely branched, antheridial cells mostly clavate. OOSPORES: Plerotic, 11-20(av. 16.7± 0.7-95% c.1.)..um diam. Ooplast 6-11 (av. 8.5)..um diam. TEMPERATURE-GROWTH RELATIONSHIPS:Minimum 50C, optimum 250C, maximum 37oC. Daily growth rate on CMA at 250C 21.88. MATERIAL EXAMINED: ex soil, Ram Alia' (FCCAUI28.1; FCCAU128.2; FCCAU 128.3). OCCURRENCE: Rarely isolated from soil, it was found in only one of the soils sampled. 39
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: MATERIAL EXAMINED: ex Vitia fabae,
Page 45 and 46: PYTHIUM MIDDLETON II Sparrow, Aquat
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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