Rusty Crust
Skeletocutis amorpha · Family Incrustoporiaceae · Updated October 2026
105US records
26states
Sepbusiest month
105 US records since 1886 (2 in the last 10 years)
Last seen Nov 11, 2022 (about 4 years ago) near Tumwater, Thurston County, WA, a preserved specimen in University of Washington Herbarium (WTU) - Macrofungi Collection. Most US records come from Idaho, Pennsylvania and Tennessee, and the busiest months are Sep, Aug 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: Sep, Aug, Oct.
Where it's recorded
Top counties
- Bonner County, ID (18) · latest Aug 3, 1955
- Blount County, TN (9) · latest Jul 20, 1963
- Centre County, PA (8) · latest Oct 9, 1918
- St. Landry Parish, LA (3) · latest 1886-04
- Ravalli County, MT (3) · latest Sep 30, 1916
- Orange County, NC (3) · latest Oct 18, 1945
- Aiken County, SC (3)
- Mason County, WA (3) · latest Jul 22, 2018
- Alachua County, FL (2) · latest Jul 13, 1938
- Kootenai County, ID (2) · latest Jul 1, 1957
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.