ILLUSTRATIONS xxv 



FIGURE PAGE 



57. Polymyxa graminis Ledingham in roots of wheat .... 769 



58. Woroninaceae 778 



59. Plasmodiophoraceae 786 



60. Ectrogellaceae and Thraustochytriaceae 806 



61. Development of Eurychasma dicksonii (Wright) Magnus in 



Striaria 818 



62. Eurychasmidium tumefaciens (Magnus) Sparrow in Ceramium 



diaphanum 821 



63. Ectrogellaceae and Thraustochytriaceae 824 



64. Aphanomycopsis bacillariacearum Scherffel in diatoms. . . 826 



65. Saprolegniaceae 836 



66. Saprolegniaceae 842 



67. Cytology of Apodachlya brachynema (Hildebrand) Pringsheim 862 



68. Cytology of sexual organs of Rhipidium interruptum Cornu 866 



69. Leptomitaceae 875 



70. Rhipidiaceae 890 



71. Rhipidium 894 



72. Mindeniella spinospora Kanouse 902 



73. Olpidiopsis achlyae McLarty on Achlya 906 



74. Cytology of Olpidiopsis ve.xans Barrett 908 



75. Olpidiopsidaceae 939 



76. Olpidiopsidaceae 960 



77. Sirolpidium bryopsidis (de Bruyne) H. E. Petersen .... 967 



78. Pontisma lagenidioides H. E. Petersen in Ceramium ... 969 



79. Lagenidiaceae 977 



80. Lagenidium 987 



81. Lagenidium 1002 



82. Lagenidium 1004 



83. Formation of zoospores in Pythium 1016 



84. Sexual reproduction in Pythium 1018 



85. Zoophagus 1029 



86. Pythium 1° 30 



87. Pythium 1032 



88. Pythiogeton 1° 45 



89. Pythiaceae 1° 55 



90. Phytophthora 1° 59 



91. Ancylistes 1° 66 



