20 



CULTIVATION AND GROWTH 



Table 3. pH Optima of Some Fungi and Actinomycetes* 



Organism 



Aphanomyces euteiches {21 A) 

 Aspergillus flavus (28) 

 A. niger (28) 

 Boletus variegatus (198) 

 Botryosporium (?) sp. (149) 

 Cercospora kikuchii (70) 

 Chalara quercina (14) 

 Chytridium sp. (61) 

 Colletotrichum hibisci (314) 

 Coprinus sp. (154) 

 Fomes annosus (89) 

 F.fraxineus (203) 

 Fusarium aquaeductum (229) 

 F. aurantiacum (260) 

 Geotrichum sp. (229) 

 Marasmius graminum (182) 

 Merulius confluens (219) 

 Mycogone perniciosa (311) 

 Neurospora crassa (253) 

 Ophiobolus graminis (327) 

 Penicillium expansum (28) 

 P. glaucum (2) 

 Phlyctorhiza variabilis (251) 

 Phycomyces blakesleeanus (47) 

 Pythiogeton sp. (52) 

 Sepedonium sp. (230) 

 Septoria pepli (266) 

 Streptomyces coelicolor (57) 

 iS". scabies (318) 

 Tricholoma nudum (222) 

 Trichophyton persicolor (285) 

 Trichosporon cutaneum (229) 

 Verticillium malthousii (311) 

 V.psalliotae (311) 



* For reasons discussed in the text, these figures must be considered as approxi- 

 mations and as limited to the conditions of the particular experiment. 



f Defined for this table as the pH range tested in which the growth was within 

 10 per cent of the maximum growth. 



% With added calcium and magnesium in the medium. 



