Mutatoderma heterocystidium
Family Hyphodermataceae · Updated October 2026
64US records
15states
Sepbusiest month
64 US records since 1880 (0 in the last 10 years)
Last seen Jun 2, 1986 (about 40 years ago) near Carbondale, Jackson County, IL, a preserved specimen in University of Illinois, Illinois Natural History Survey Fungarium - Fungi. Most US records come from New York, Pennsylvania and Illinois, and the busiest months are Sep, Oct and Aug. (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, Oct, Aug.
Where it's recorded
Top counties
- Tompkins County, NY (9) · latest Sep 4, 1952
- Grant County, KY (5) · latest Oct 1, 1914
- Gloucester County, NJ (4) · latest 1881-12
- Bedford County, PA (3) · latest Aug 8, 1940
- Hamilton County, OH (3) · latest Oct 1, 1914
- Yancey County, NC (3) · latest 1901-09
- Rock Island County, IL (2) · latest 1903-06
- Jackson County, MS (2) · latest 1896-06
- Butler County, PA (2) · latest Aug 21, 1941
- Lorain County, OH (2) · latest Oct 9, 1930
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.