Warlock's Butter
Exidia nigricans · Family Auriculariaceae · Updated October 2026
120US records
25states
Aprbusiest month
120 US records since 1944 (115 in the last 10 years)
Last seen Sep 4, 2026 (about 7 weeks ago) near Swarthmore, Delaware County, PA, photographed by an iNaturalist user, with the ID agreed on by other iNaturalist users (research grade). Most US records come from Pennsylvania, New York and Virginia, and the busiest months are Apr, Jan and May. (Data as of October 26, 2026; records can lag by weeks.)
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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: Apr, Jan, May.
Where it's recorded
Top counties
- Allegheny County, PA (10) · latest Dec 27, 2025
- Fairfax County, VA (7) · latest Nov 21, 2025
- Brown County, IN (6) · latest Jan 17, 2023
- Kings County, NY (5) · latest Mar 6, 2024
- Queens County, NY (4) · latest May 31, 2025
- Bronx County, NY (4) · latest May 7, 2025
- Beaver County, PA (3) · latest Jan 8, 2026
- Monroe County, NY (3) · latest Apr 11, 2024
- Wise County, VA (3) · latest May 20, 2020
- Delaware County, PA (3) · latest Sep 4, 2026
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.