Occurrence (3)--42
    and distribution (1)--8
    and environment (3)--42
        animals (3)--56
        elevation (3)--55
        hydrogen ion concentration (3)--50
        light (3)--56
        mineral and organic content, soil and water (3)--48
        other fungi (3)--56
        oxygen (3 )--44
        salinity (3)--52
        soil depth (3)--55
        soil moisture (3)--47
        temperature (3)--42
    seasonal (5)--74
Oogenesis (9)--140
    of single oospores (9)--144
    Aphanomyces species (9)--145
    Leptolegnia species (9)--146
    Plectospira species (9) --146
Oogoniol (21)--309
Oospore germination (10)--153
Oospore types (10)--151
    periodicity of (5)--82