Rusty underside of a leaf of northern oak fern Gymnocarpium dryopteris affected by a fungal disease fir-oak-fern rust (Hyalopsora aspidiotus) near Kavgolovskoe Lake in Toksovo, north from Saint Petersburg. Russia, July 14, 2017Synonyms: Hyalopsora polypodii-dryopteridis, Melampsorella aspidiotis, Uredo aspidiotus, Uredo filicum, Uredo polypodii.
Common name: oak fern rust.
Hyalopsora aspidiotus is a species of rust fungus that infects ferns, specifically Aspidium spp. In St. Petersburg, Leningrad Oblast, and north-western Russia, it has been found to commonly occur on Athyrium filix-femina and Dryopteris spp., with infections typically appearing as yellow or orange spore masses on the underside of fronds. The fungus is widespread in the region, with frequent records from mixed and coniferous forests, as well as urban parks and gardens.
Rusty underside of a leaf of northern oak fern Gymnocarpium dryopteris affected by a fungal disease fir-oak-fern rust (Hyalopsora aspidiotus) near Kavgolovskoe Lake in Toksovo, north from Saint Petersburg. Russia, July 14, 2017
Fir-oak-fern rust (Hyalopsora aspidiotus) fungus on a leaf of northern oak fern Gymnocarpium dryopteris near Kavgolovskoe Lake in Toksovo, north from Saint Petersburg. Russia, July 14, 2017Observations of Hyalopsora aspidiotus in Leningrad Oblast and north-western Russia reveal the fungus's presence on northern oak ferns (Gymnocarpium dryopteris). The fungal disease, known as fir-oak-fern rust, affects the underside of leaves, giving them a rusty appearance. Specifically, near Kavgolovskoe Lake in Toksovo, north of Saint Petersburg, infected leaves were found with the fungus on July 14, 2017. The fungus was observed on the leaves of northern oak ferns in this region, indicating its presence in the area. The observations suggest that Hyalopsora aspidiotus is active in Leningrad Oblast and north-western Russia during the summer months, infecting local fern species and causing noticeable damage to their leaves. The fungus's impact on the ecosystem and plant diversity in the region may be significant.
Russian web-forums Planeta Gribov, V Kontakte, and Griby Sredney Polosy for learning names of local mushrooms.
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