Smooth-walled oogonium of P. alni (Swedish variant) with oospore and amphigynous antheridium.
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P. alni oogonia  |
P. alni basal canker on European Alder  P. alni basal canker on European Alder (Alnus glutinosa) |
P. alni sporangia  Non-papillate sporangia of P. alni showing nested proliferation. |
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P. alni in alder forest, Germany, with T. Jung  P. alni in alder forest, Germany, with T. Jung |
P. alni canker on gray alder  Grey alder (A. incana) with collar rot caused by P. alni |
P. alni lesion in alder, Illwald, France  P. alni lesion in alder, Illwald, France |
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P. alni oogonium  Bullate oogonium of P. alni (German variant) with oospore and amphigynous antheridium. |
P. alni oogonia subspecies and variants  Fig. 40. P. alni subsp. uniformis. Fig. 41. P. alni subsp. multiformis German variant. Fig. 42. P. alni subsp. alni. Fig. 43. |
P. alni in riparian alder, Germany  P. alni in riparian alder, Germany |
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P. alni in riparian alder, Scotland  P. alni in riparian alder, Scotland |
P. alni symptoms on European Alder  Mature, riparian common alder (A. glutinosa) stand heavily impacted by root and collar rot caused by P. alni |
P. alni symptoms on European Alder  Mature, riparian common alder (A. glutinosa) stand with high impact of Phytophthora root and collar rot. |