Mushroom Sightings
Mushroom Sightings
What's been spotted in the woods near you
Home › Species › Calhoun's Pinwheel

Calhoun's Pinwheel

Calhoun's Pinwheel (Marasmius calhouniae), photo
Photo: LJ Moore-McClelland, CC BY 4.0 · iNaturalist
Marasmius calhouniae · Family Marasmiaceae · Updated October 2026
81US records
1states
Janbusiest month
81 US records since 1977 (49 in the last 10 years)

Last seen Mar 1, 2026 (about 8 months ago) near Timber Cove, Sonoma County, CA, photographed by an iNaturalist user, with the ID agreed on by other iNaturalist users (research grade). Most US records come from California, and the busiest months are Jan, Dec and Nov. (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

Jan33Feb6Mar2Apr0May0Jun0Jul0Aug0Sep0Oct3Nov12Dec25

Records by month, all years. Busiest: Jan, Dec, Nov.

Where it's recorded

StateRecordsLatest sighting
California81Mar 1, 2026

Top counties

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 Amazon

As an Amazon Associate we earn from qualifying purchases.