Sour Cap Suillus
Suillus acidus · Family Suillaceae · Updated October 2026
80US records
17states
Augbusiest month
80 US records since 1905 (26 in the last 10 years)
Last seen Sep 23, 2025 (about 13 months ago) near Glocester, Providence County, RI, photographed by an iNaturalist user, with the ID agreed on by other iNaturalist users (research grade). Most US records come from Michigan, New York and Minnesota, 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
Top counties
- Cheboygan County, MI (11) · latest Sep 7, 1969
- Franklin County, NY (7) · latest Aug 17, 2025
- Marquette County, MI (5) · latest Aug 13, 1968
- Clearwater County, MN (4) · latest Aug 29, 2014
- Carlton County, MN (4) · latest Sep 7, 2014
- Transylvania County, NC (4) · latest Aug 26, 2023
- Chippewa County, MI (3) · latest Aug 12, 1967
- Blount County, TN (3) · latest Sep 28, 2015
- Macon County, NC (3) · latest Aug 26, 1978
- Dauphin County, PA (3) · latest Sep 30, 2022
More on this species from GBIF.
Bring along
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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.