Peniophora polygonia
Family Peniophoraceae · Updated October 2026
30US records
10states
Sepbusiest month
30 US records since 1888 (0 in the last 10 years)
Last seen Aug 21, 1979 (about 47 years ago) near Durango, La Plata County, CO, a preserved specimen in Fort Lewis College Herbarium. Most US records come from Colorado, Idaho and Arizona, and the busiest months are Sep, Aug and May. (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, May.
Where it's recorded
Top counties
- Bonner County, ID (9) · latest Aug 2, 1939
- Boulder County, CO (4) · latest Aug 21, 1964
- Coconino County, AZ (2) · latest Aug 19, 1973
- Carroll County, NH (1) · latest Apr 19, 1908
- La Plata County, CO (1) · latest Aug 21, 1979
- San Juan County, CO (1) · latest Sep 9, 1978
- Delta County, CO (1) · latest Sep 14, 1929
- Mercer County, NJ (1)
- Park County, CO (1) · latest Sep 3, 1910
- Custer County, CO (1) · latest 1888
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.