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Fungi: Ascomycota: Leotiomycetes: Rhytismatales: Rhytismataceae: Rhytisma acerinum (Pers.) Fr., 1819

Rhytisma acerinum – Sycamore tarspot

Synonyms: Melanosorus acerinus, Melasmia acerina, Polystigma acerinum, Rhytisma pseudoplatani, Xyloma acerinum, Xyloma gyrans, Xyloma lacrymans.

Common name: sycamore tarspot.

Russian name: Ritisma klenovaya.

Extract from Wikipedia article: Rhytisma acerinum is a plant pathogen that commonly affects sycamores and maples in late summer and autumn, causing tar spot. Tar spot does not usually have an adverse effect on the trees' long-term health. R. acerinum is an Ascomycete fungus that locally infects the leaves of trees and is a biotrophic parasite. The disease is cosmetic and is therefore usually controlled only with sanitation methods.

Photos of this mushroom from the area of St. Petersburg, Russia

Tar rot on maple leaves (<B>Rhytisma acerinum</B>) in Sosnovka Park. Saint Petersburg, Russia, <A HREF="../date-en/2016-10-08.htm">October 8, 2016</A>
LinkTar rot on maple leaves (Rhytisma acerinum) in Sosnovka Park. Saint Petersburg, Russia, October 8, 2016
Location on mapsPamyatnik Voyennym Letchikam, Sankt-Peterburg, Russia, 194223
Tar rot fungus on fallen maple leaves, <B>Rhytisma acerinum</B> mushroom, in Sosnovka Park. Saint Petersburg, Russia, <A HREF="../date-en/2016-10-31.htm">October 31, 2016</A>
LinkTar rot fungus on fallen maple leaves, Rhytisma acerinum mushroom, in Sosnovka Park. Saint Petersburg, Russia, October 31, 2016
Location on mapsPamyatnik Voyennym Letchikam, Sankt-Peterburg, Russia, 194223
Tar rot fungus (<B>Rhytisma acerinum</B>) on fallen maple leaves in Sosnovka Park. Saint Petersburg, Russia, <A HREF="../date-en/2017-03-23.htm">March 23, 2017</A>
LinkTar rot fungus (Rhytisma acerinum) on fallen maple leaves in Sosnovka Park. Saint Petersburg, Russia, March 23, 2017
Location on mapsPamyatnik Voyennym Letchikam, Sankt-Peterburg, Russia, 194223
Tar rot fungus (<B>Rhytisma acerinum</B>) on last year maple leaves in Sosnovka Park. Saint Petersburg, Russia, <A HREF="../date-en/2017-03-23.htm">March 23, 2017</A>
LinkTar rot fungus (Rhytisma acerinum) on last year maple leaves in Sosnovka Park. Saint Petersburg, Russia, March 23, 2017
Location on mapsPamyatnik Voyennym Letchikam, Sankt-Peterburg, Russia, 194223
Tar rot fungus (<B>Rhytisma acerinum</B>) on a maple leaf taken from Sosnovka Park. Saint Petersburg, Russia, <A HREF="../date-en/2017-03-23.htm">March 23, 2017</A>
LinkTar rot fungus (Rhytisma acerinum) on a maple leaf taken from Sosnovka Park. Saint Petersburg, Russia, March 23, 2017
Location on mapspr. Raevskogo, 24, Sankt-Peterburg, Russia, 194064
Sycamore tarspot fungus (<B>Rhytisma acerinum</B>) in a forest along the gulf in area of Lisiy Nos - Morskaya, west from Saint Petersburg. Russia, <A HREF="../date-en/2017-09-26.htm">September 26, 2017</A>
LinkSycamore tarspot fungus (Rhytisma acerinum) in a forest along the gulf in area of Lisiy Nos - Morskaya, west from Saint Petersburg. Russia, September 26, 2017
Location on mapsPrimorskoye Shosse, Sankt-Peterburg, Russia, 197755
Sycamore tarspot fungus (<B>Rhytisma acerinum</B>) on fallen maple leaves in a forest along the gulf in area of Lisiy Nos - Morskaya, west from Saint Petersburg. Russia, <A HREF="../date-en/2017-09-26.htm">September 26, 2017</A>
LinkSycamore tarspot fungus (Rhytisma acerinum) on fallen maple leaves in a forest along the gulf in area of Lisiy Nos - Morskaya, west from Saint Petersburg. Russia, September 26, 2017
Location on mapsPrimorskoye Shosse, Sankt-Peterburg, Russia, 197755

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Acknowledgements

Russian web-forums Planeta Gribov, V Kontakte, and Griby Sredney Polosy for learning names of local mushrooms.

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