Microscopic

Typical ovoid papillate sporangia of Phytophthora arenaria on V8 agar flooded with soil extract

P. cactorum sporangium

P. cactorum sporangia

Caducous papillate sporangium of P. megakarya

Terminal chlamydospore of P. megakarya

P. palmivora caducous papillate sporangia

P. palmivora oogonium

Terminal chlamydospore of P. palmivora

P. megakarya oogonia, oospore, and antheridium

Fig. 40. P. alni subsp. uniformis. Fig. 41.  P. alni subsp. multiformis German variant. Fig. 42. P. alni subsp. alni. Fig. 43.