Mothball Crust
Scytinostroma portentosum · Family Peniophoraceae · Updated October 2026
129US records
27states
Octbusiest month
129 US records since 1874 (7 in the last 10 years)
Last seen Jun 22, 2023 (about 3 years ago) near Auberry, Madera County, CA, a preserved specimen in International Barcode of Life project (iBOL). Most US records come from Florida, Pennsylvania and Ohio, and the busiest months are Oct, Sep and Mar. (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, Mar.
Where it's recorded
Top counties
- Chester County, PA (12) · latest 1881-10
- Miami-Dade County, FL (11) · latest Sep 9, 1950
- Monroe County, FL (6) · latest Oct 22, 1958
- Polk County, FL (5) · latest 1887
- New Castle County, DE (4) · latest Oct 29, 1892
- Orleans Parish, LA (4) · latest Jul 24, 1992
- Tompkins County, NY (4) · latest Apr 26, 1936
- Riverside County, CA (3) · latest Mar 2, 2023
- Clayton County, GA (3) · latest Jul 5, 1964
- Hamilton County, OH (3) · latest Mar 21, 1936
More on this species from GBIF.
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 AmazonAs an Amazon Associate we earn from qualifying purchases.