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Annosus Root Disease

Heterobasidion annosum · Family Bondarzewiaceae · Updated October 2026

578US records

40states

Octbusiest month

578 US records since 1864 (75 in the last 10 years)

Last seen Nov 5, 2022 (about 4 years ago) near Presidential Lakes Estates, Burlington County, NJ, photographed by an iNaturalist user, with the ID agreed on by other iNaturalist users (research grade). Most US records come from New Jersey, Washington and Pennsylvania, and the busiest months are Oct, Sep and Aug. (Data as of October 26, 2026; records can lag by weeks.)

⚠ Never eat a wild mushroom based on this site. We show where fungi have been recorded, nothing more. We never say any mushroom is edible or safe, and you shouldn't decide that from any website, app or photo. Many deadly mushrooms look like harmless ones. If someone may have eaten a wild mushroom, call Poison Control at 1-800-222-1222 right away.

Lookalike warning. Many mushrooms, including deadly ones, closely resemble each other, and the only reliable identification comes from an expert looking at the actual specimen (often with spore prints or microscopy). Never use a name, photo or record count on this page to decide what something is.

When it's recorded

Records by month, all years. Busiest: Oct, Sep, Aug.

Where it's recorded

State	Records	Latest sighting
New Jersey	203	Nov 5, 2022
Washington	34	Apr 19, 2015
Pennsylvania	30	2019
New York	27	Jul 20, 1978
Idaho	24	Oct 14, 1956
Florida	21	Jul 19, 1980
California	20	Oct 4, 1986
North Carolina	20	Sep 10, 1996
Illinois	20	Nov 9, 1989
Connecticut	18	Nov 10, 1950
Alabama	14	1950-11
Maryland	12	Nov 15, 1972

Top counties

Sussex County, NJ (36) · latest Sep 28, 2019
Ocean County, NJ (34) · latest Oct 26, 2019
Mercer County, NJ (26) · latest May 4, 2019
Morris County, NJ (22) · latest Jul 20, 2019
Burlington County, NJ (21) · latest Nov 5, 2022
Alachua County, FL (15) · latest Jul 19, 1980
Hunterdon County, NJ (15) · latest Aug 25, 2019
Bucks County, PA (13) · latest 2019
Monmouth County, NJ (13) · latest Aug 22, 2015
Middlesex County, NJ (12) · latest Aug 18, 2019

Bring along

🍄

Regional mushroom field guideSee on Amazon

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Folding mushroom knife with brushSee on Amazon

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Wicker foraging basketSee on Amazon

🍄

10x hand lens / loupeSee on Amazon

🍄

Spore print paperSee on Amazon

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