Entoloma mammosum
Family Entolomataceae · Updated October 2026
57US records
13states
Janbusiest month
57 US records since 1900 (0 in the last 10 years)
Last seen Mar 5, 1988 (about 39 years ago) near La Grande, Pierce County, WA, a preserved specimen in University of Washington Herbarium (WTU) - Macrofungi Collection. Most US records come from Tennessee, New York and Pennsylvania, and the busiest months are Jan, Oct and Dec. (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.
☠ Dangerous genus. The genus Entoloma includes species that cause severe stomach poisoning. Mushrooms in this group have caused serious or fatal poisonings.
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: Jan, Oct, Dec.
Where it's recorded
Top counties
- Tompkins County, NY (8) · latest Jul 22, 1904
- Knox County, TN (7) · latest Mar 30, 1969
- Lee County, AL (4) · latest Jan 6, 1901
- Pierce County, WA (4) · latest Mar 5, 1988
- Santa Clara County, CA (3) · latest Mar 9, 1907
- Blount County, TN (3) · latest Dec 21, 1961
- Marion County, OR (2) · latest 1911-01
- Allegheny County, PA (2) · latest Oct 16, 1985
- Benzie County, MI (2) · latest 1916-09
- Anderson County, TN (2) · latest Jan 1, 1943
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.