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Mushrooms in Marin County, California
Updated October 2026 · from open GBIF records
7,237mushroom records
908species recorded
Janbusiest month
7,237 records since 1884 (4,979 in the last 10 years)
Fruiting now
Based on past sightings (mostly since 2011; all years where recent records are few), not a forecast. Weather and place matter a lot, and a listing here says nothing about whether a mushroom is safe.
Usually recorded in January here:
Golden Milk Cap Lactarius alnicola64 January records since 2011
California Jack O' Lantern Omphalotus olivascens54 January records since 2011
Fly Agaric Amanita muscaria43 January records since 2011
Turkeytail Trametes versicolor37 January records since 2011
Western Amethyst Laccaria Laccaria amethysteo-occidentalis36 January records since 2011
Death Cap Amanita phalloides35 January records since 2011
Sulphur Tuft Hypholoma fasciculare31 January records since 2011
Majestic Amanita Amanita augusta30 January records since 2011
Wood Blewit Lepista nuda26 January records since 2011
Mulch Maids Leratiomyces percevalii24 January records since 2011
Yellow Fieldcap Bolbitius titubans24 January records since 2011
Hairy Curtain Crust Stereum hirsutum24 January records since 2011
Usually recorded in February here:
- Turkeytail Trametes versicolor29 February records since 2011
- Hairy Curtain Crust Stereum hirsutum20 February records since 2011
- Majestic Amanita Amanita augusta19 February records since 2011
Scarlet Hood Hygrocybe coccinea16 February records since 2011- California Jack O' Lantern Omphalotus olivascens15 February records since 2011
- Mulch Maids Leratiomyces percevalii14 February records since 2011
Golden Waxy Cap Hygrocybe flavescens13 February records since 2011- Sulphur Tuft Hypholoma fasciculare13 February records since 2011
Bittersweet Orange Ringless Amanita Amanita velosa11 February records since 2011- Yellow Fieldcap Bolbitius titubans11 February records since 2011
Bleeding Fairy Helmet Mycena haematopus8 February records since 2011- Birch Mazegill, Gilled Polypore Lenzites betulinus8 February records since 2011
Usually recorded in March here:
- Bittersweet Orange Ringless Amanita Amanita velosa40 March records since 2011
- Turkeytail Trametes versicolor29 March records since 2011
- Hairy Curtain Crust Stereum hirsutum19 March records since 2011
- Mulch Maids Leratiomyces percevalii16 March records since 2011
Red Cage Clathrus ruber15 March records since 2011- Birch Mazegill, Gilled Polypore Lenzites betulinus9 March records since 2011
Artist's Conk Ganoderma brownii9 March records since 2011
Spring Fieldcap Agrocybe praecox7 March records since 2011- California Jack O' Lantern Omphalotus olivascens7 March records since 2011
- Scarlet Hood Hygrocybe coccinea7 March records since 2011
- Sulphur Tuft Hypholoma fasciculare6 March records since 2011
Common Porecrust, Split Gill Fungus Schizophyllum commune6 March records since 2011
Usually recorded in April here:
- Turkeytail Trametes versicolor33 April records since 2011
- Bittersweet Orange Ringless Amanita Amanita velosa19 April records since 2011
- Red Cage Clathrus ruber15 April records since 2011
- Birch Mazegill, Gilled Polypore Lenzites betulinus14 April records since 2011
- Artist's Conk Ganoderma brownii13 April records since 2011
- Hairy Curtain Crust Stereum hirsutum13 April records since 2011
Lilac Oysterling Panus conchatus12 April records since 2011- Mulch Maids Leratiomyces percevalii11 April records since 2011
Northern Red Belt Fomitopsis mounceae7 April records since 2011- Common Porecrust, Split Gill Fungus Schizophyllum commune6 April records since 2011
Pale Brittlestem Candolleomyces candolleanus5 April records since 2011
Golden Bracket Fuscoporia gilva5 April records since 2011
Usually recorded in May here:
- Red Cage Clathrus ruber14 May records since 2011
- Artist's Conk Ganoderma brownii9 May records since 2011
- Death Cap Amanita phalloides7 May records since 2011
- Turkeytail Trametes versicolor6 May records since 2011
- Hairy Curtain Crust Stereum hirsutum6 May records since 2011
- Birch Mazegill, Gilled Polypore Lenzites betulinus4 May records since 2011
Blushing Bride Amanita novinupta4 May records since 2011- Lilac Oysterling Panus conchatus3 May records since 2011
Cep Boletus edulis3 May records since 2011
Great Pine Jewel Amanita magniverrucata2 May records since 2011
Egghead Mottlegill Panaeolus semiovatus2 May records since 2011
Western Giant Puffball Calvatia booniana2 May records since 2011
Usually recorded in June here:
- Turkeytail Trametes versicolor7 June records since 2011
- Red Cage Clathrus ruber3 June records since 2011
Rosy Conk Rhodofomes cajanderi2 June records since 2011- Birch Mazegill, Gilled Polypore Lenzites betulinus2 June records since 2011
- Artist's Conk Ganoderma brownii2 June records since 2011
Artist's Bracket Ganoderma applanatum2 June records since 2011- Majestic Amanita Amanita augusta2 June records since 2011
Usually recorded in July here:
- Artist's Conk Ganoderma brownii3 July records since 2011
- Rosy Conk Rhodofomes cajanderi2 July records since 2011
Paragymnopus sequoiae2 July records since 2011- Red Cage Clathrus ruber2 July records since 2011
Oak-Leaf Pinwheel Collybiopsis quercophila2 July records since 2011- Northern Red Belt Fomitopsis mounceae2 July records since 2011
- Turkeytail Trametes versicolor2 July records since 2011
Usually recorded in August here:
- Turkeytail Trametes versicolor5 August records since 2011
- Death Cap Amanita phalloides4 August records since 2011
- Majestic Amanita Amanita augusta3 August records since 2011
Parasitic Clitocybe Clitocybe sclerotoidea2 August records since 2011
Bulbous Bonnet Mycena stylobates2 August records since 2011- Birch Mazegill, Gilled Polypore Lenzites betulinus2 August records since 2011
Collybiopsis villosipes2 August records since 2011
Yellow Stainer Agaricus xanthodermus2 August records since 2011
Usually recorded in September here:
Western Chicken-Of-The-Woods Laetiporus gilbertsonii11 September records since 2011
Honey Waxcap Hygrocybe reidii7 September records since 2011
Saffron Crep Crepidotus crocophyllus4 September records since 2011
Orange-Gilled Waxycap Humidicutis marginata4 September records since 2011- Artist's Conk Ganoderma brownii4 September records since 2011
- Pale Brittlestem Candolleomyces candolleanus3 September records since 2011
- Entoloma exalbidum3 September records since 2011
Goblet Waxcap Hygrocybe cantharellus3 September records since 2011- Majestic Amanita Amanita augusta3 September records since 2011
Simocybe serrulata2 September records since 2011
Dripping Bonnet Roridomyces roridus2 September records since 2011
Frosty Bonnet Mycena tenerrima2 September records since 2011
Usually recorded in October here:
- Western Chicken-Of-The-Woods Laetiporus gilbertsonii17 October records since 2011
- Yellow Stainer Agaricus xanthodermus4 October records since 2011
- Death Cap Amanita phalloides4 October records since 2011
- Saffron Crep Crepidotus crocophyllus2 October records since 2011
Bark Bonnet Phloeomana speirea2 October records since 2011- Lepiota rubrotinctoides2 October records since 2011
Alice Eastwood's Bolete Rubroboletus eastwoodiae2 October records since 2011- Red Cage Clathrus ruber2 October records since 2011
- Hairy Curtain Crust Stereum hirsutum2 October records since 2011
Ballen's American Caesar Amanita calyptroderma2 October records since 2011- Turkeytail Trametes versicolor2 October records since 2011
Usually recorded in November here:
- Death Cap Amanita phalloides30 November records since 2011
- California Jack O' Lantern Omphalotus olivascens18 November records since 2011
- Fly Agaric Amanita muscaria18 November records since 2011
- Hairy Curtain Crust Stereum hirsutum12 November records since 2011
- Sulphur Tuft Hypholoma fasciculare12 November records since 2011
- Mulch Maids Leratiomyces percevalii11 November records since 2011
- Turkeytail Trametes versicolor11 November records since 2011
- Yellow Fieldcap Bolbitius titubans11 November records since 2011
Chip Cherries Leratiomyces ceres11 November records since 2011- Western Chicken-Of-The-Woods Laetiporus gilbertsonii9 November records since 2011
- Golden Milk Cap Lactarius alnicola9 November records since 2011
- Ballen's American Caesar Amanita calyptroderma8 November records since 2011
Usually recorded in December here:
- Fly Agaric Amanita muscaria58 December records since 2011
- Death Cap Amanita phalloides57 December records since 2011
- California Jack O' Lantern Omphalotus olivascens40 December records since 2011
- Sulphur Tuft Hypholoma fasciculare32 December records since 2011
- Golden Milk Cap Lactarius alnicola28 December records since 2011
- Hairy Curtain Crust Stereum hirsutum28 December records since 2011
Honey Fungus Armillaria mellea24 December records since 2011- Turkeytail Trametes versicolor24 December records since 2011
- Wood Blewit Lepista nuda20 December records since 2011
- Majestic Amanita Amanita augusta19 December records since 2011
- Mulch Maids Leratiomyces percevalii18 December records since 2011
Pleated Marasmius Marasmius plicatulus18 December records since 2011
⚠ 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.
Most-recorded species
| # | Species | Records |
|---|---|---|
| 1 | 210 | |
| 2 | 156 | |
| 3 | 142 | |
| 4 | 140 | |
| 5 | 129 | |
| 6 | 117 | |
| 7 | 112 | |
| 8 | 96 | |
| 9 | 96 | |
| 10 | 89 | |
| 11 | 88 | |
| 12 | 85 | |
| 13 | 79 | |
| 14 | 78 | |
| 15 | 74 |
Being on this list doesn't mean a mushroom is common, easy to identify or safe. It only means it has been recorded here often.
Best months to look
Records by month, all years. Busiest: Jan, Dec, Feb.
Sightings map
● Each dot is a place with at least one record (rounded to about 1 km). Locations can be approximate, and many are on private land. Numbered blue circles are recent sightings, shown only to a general area of about 10 km.
Recent sightings
The 10 most recent dated records in this county, newest first. Data as of October 26, 2026. Records can take weeks or more to reach GBIF, so the newest finds may not show yet. Places are given only as a public park or forest (from the USGS Protected Areas Database) or the nearest town, and the numbered circles on the map cover a general area, not an exact spot.
- 1Sep 18, 2026Majestic Amanita Amanita augustanear Inverness, CA · iNaturalist photo, research grade · original record
- 2Sep 10, 2026Western Chicken-Of-The-Woods Laetiporus gilbertsoniiin Point Reyes National Seashore, CA · iNaturalist photo, research grade · original record
- 3Sep 9, 2026Birch Mazegill, Gilled Polypore Lenzites betulinusin Point Reyes National Seashore, CA · iNaturalist photo, research grade · original record
- 4Sep 7, 2026Western Chicken-Of-The-Woods Laetiporus gilbertsoniinear Tamalpais-Homestead Valley, CA (location blurred by the observer) · iNaturalist photo, research grade · original record
- 5
Aug 14, 2026Plantpot Dapperling Leucocoprinus birnbaumiinear Sleepy Hollow, CA · iNaturalist photo, research grade · original record - 6Jun 23, 2026Majestic Amanita Amanita augustanear Inverness, CA · iNaturalist photo, research grade · original record
- 7Jun 21, 2026Majestic Amanita Amanita augustain Point Reyes National Seashore, CA · iNaturalist photo, research grade · original record
- 8Jun 13, 2026Turkeytail Trametes versicolorin Tomales Bay State Park, CA · iNaturalist photo, research grade · original record
- 9May 18, 2026Death Cap Amanita phalloidesin Petaluma Marsh Wildlife Area, CA · iNaturalist photo, research grade · original record
- 10May 18, 2026Birch Mazegill, Gilled Polypore Lenzites betulinusnear Novato, CA · iNaturalist photo, research grade · original record
Many sightings are on private land. Always get the landowner's permission, and follow the rules of parks and forests, which often limit or ban collecting.
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.
How we built this page
7,237 records of mushrooms, shelf fungi and polypores (class Agaricomycetes) that fall inside this county's Census boundary. Licenses: 2,892 CC0 and 4,345 CC BY 4.0. See about the data for the full citation.