Home › Species › Tomentosus Root Rot

Tomentosus Root Rot

Onnia tomentosa · Family Hymenochaetaceae · Updated October 2026

625US records

35states

Augbusiest month

625 US records since 1874 (172 in the last 10 years)

Last seen Aug 22, 2026 (about 2 months ago) in Apache National Forest, AZ, photographed by an iNaturalist user, with the ID agreed on by other iNaturalist users (research grade). Most US records come from New Jersey, Colorado and Alaska, and the busiest months are Aug, Sep and Oct. (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: Aug, Sep, Oct.

Where it's recorded

State	Records	Latest sighting
New Jersey	199	Nov 3, 2019
Colorado	70	Sep 14, 2024
Alaska	36	Aug 24, 2025
Pennsylvania	36	Sep 28, 2023
Washington	30	Sep 22, 2024
New York	25	Nov 11, 2020
Montana	22	2024
Idaho	19	Aug 22, 1997
North Carolina	16	Sep 25, 2015
Wisconsin	15	Jul 17, 2010
West Virginia	14	Jul 27, 2009
Michigan	14	Sep 11, 1960

Top counties

Sussex County, NJ (38) · latest Sep 28, 2019
Ocean County, NJ (31) · latest Oct 26, 2019
Anchorage Municipality, AK (24) · latest Aug 24, 2025
Mercer County, NJ (24) · latest May 4, 2019
Morris County, NJ (22) · latest Jul 20, 2019
Burlington County, NJ (20) · latest Oct 6, 2018
Gunnison County, CO (17) · latest Sep 14, 2024
Hunterdon County, NJ (15) · latest Aug 25, 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

🍄

Folding mushroom knife with brushSee on Amazon

🍄

Wicker foraging basketSee on Amazon

🍄

10x hand lens / loupeSee on Amazon

🍄

Spore print paperSee on Amazon

As an Amazon Associate we earn from qualifying purchases.