Crystal Brain Fungus
Myxarium nucleatum · Family Hyaloriaceae · Updated October 2026
804US records
34states
Janbusiest month
804 US records since 1874 (366 in the last 10 years)
Last seen Sep 4, 2026 (about 7 weeks ago) near Canonsburg, Washington County, PA, photographed by an iNaturalist user, with the ID agreed on by other iNaturalist users (research grade). Most US records come from California, New Jersey and New York, 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.
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
- Sussex County, NJ (37) · latest Sep 28, 2019
- Napa County, CA (33) · latest Dec 29, 2025
- Yolo County, CA (30) · latest Apr 2, 1978
- Ocean County, NJ (30) · latest Jan 11, 2026
- Orange County, NC (24) · latest 1944-01
- Mercer County, NJ (23) · latest May 4, 2019
- Morris County, NJ (22) · latest Jul 20, 2019
- Sonoma County, CA (20) · latest Feb 19, 2026
- Burlington County, NJ (19) · latest Oct 6, 2018
- Santa Cruz County, CA (19) · latest Feb 19, 2026
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.