Sycamore Tarspot

Rhytisma acerinum (Pers.) Fr.

Also called: Tar-Spot Fungus, Black Tar Spot, European Tar Spot

Edibility

Edibility unknown — do not eat

Never eat a wild mushroom based on this site or any app.

Photos

Photo: Sandy Wolkenberg. CC-BY. Source (inaturalist)
Photo: Rose Zappa. CC-BY. Source (inaturalist)
Photo: Andrew Sebastian. CC-BY. Source (inaturalist)
Photo: Andrew Sebastian. CC-BY. Source (inaturalist)

Lookalikes

No lookalikes are recorded for this species yet. That does not mean there are none. Many mushrooms look alike, so never rely on appearance alone.

Season

When this species has been recorded, by month, from open-licensed US and Canada observations. It shows when people report it, not a guarantee it is fruiting.

The highlighted bar is the current month.

View season data as a table

Recorded observations of Sycamore Tarspot by month
Month	Records
January	24
February	15
March	30
April	55
May	100
June	21
July	80
August	341
September	689
October	534
November	214
December	37

Where it is found

States and provinces with the most records. Check the foraging rules for the place you plan to visit.

Ontario 405 records · Foraging rules
New York 313 records · Foraging rules
Wisconsin 147 records · Foraging rules
Massachusetts 128 records · Foraging rules
Pennsylvania 121 records · Foraging rules
Michigan 99 records · Foraging rules
Illinois 85 records · Foraging rules
Quebec 80 records · Foraging rules
New Jersey 72 records · Foraging rules
Nova Scotia 62 records · Foraging rules
Connecticut 62 records · Foraging rules
Minnesota 60 records · Foraging rules
Maine 58 records · Foraging rules
Vermont 58 records · Foraging rules
Florida 41 records · Foraging rules

Show 32 more

New Hampshire36 records
Ohio30 records
Virginia22 records
New Brunswick22 records
West Virginia21 records
Maryland21 records
North Carolina21 records
Indiana20 records
Nebraska19 records
Louisiana16 records
District of Columbia14 records
Prince Edward Island14 records
Kansas12 records
Georgia12 records
Iowa12 records
Manitoba8 records
Mississippi8 records
Washington7 records
Delaware7 records
Rhode Island7 records
Newfoundland and Labrador6 records
Missouri6 records
Tennessee6 records
Alabama4 records
South Carolina3 records
South Dakota3 records
Arkansas3 records
Kentucky2 records
California2 records
Oregon2 records
Texas2 records
New Mexico1 records

All state and province foraging laws

About

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.

From Wikipedia, CC BY-SA 4.0. Read the original article.

More in the genus Rhytisma

Never eat a wild mushroom based on this site or any app. See safety basics and the disclaimer.