Mushrooms in San Juan County, Washington
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.
Too few past records in January here to list species.
Too few past records in February here to list species.
Usually recorded in March here:
- Chromosera cyanophylla2 March records since 2011
- Entoloma subcapitatum2 March records since 2011
Usually recorded in April here:
- Inocybe obscura7 April records across all years
Dirty Tricholoma Tricholoma terreum3 April records across all years
Cinnamon Fiberhead Inocybe cinnamomea3 April records across all years- Inocybe praetervisa2 April records across all years
Usually recorded in May here:
Panther Cap Amanita pantherina4 May records across all years- Inocybe hypophaea3 May records across all years
Rosy Conk Rhodofomes cajanderi2 May records across all years
Golden Gilled Bolete Phylloporus rhodoxanthus2 May records across all years
Ochre-Banded Conk Fomitopsis ochracea2 May records across all years
Little Cone Bell Entoloma holoconiotum2 May records across all years
Spotted Collybia Rhodocollybia maculata2 May records across all years- Porodaedalea gilbertsonii2 May records across all years
Northern Red Belt Fomitopsis mounceae2 May records across all years
Western American False Panther Amanita pantherinoides2 May records across all years
Usually recorded in June here:
Turkeytail Trametes versicolor4 June records across all years
Pine Bracket Porodaedalea pini2 June records across all years
Usually recorded in July here:
- Fungi Xanthoperenniporia tenuis4 July records across all years
- Inocybe obscura4 July records across all years
Corn-Silk Fiberhead Pseudosperma sororium3 July records across all years
Split Fibrecap Pseudosperma rimosum3 July records across all years
Torn Fibrecap Inocybe lacera3 July records across all years- Kneiffiella floccosa2 July records across all years
Red Belted Conk Fomitopsis pinicola2 July records across all years- Pine Bracket Porodaedalea pini2 July records across all years
Inocybe albodisca2 July records across all years
Prince Agaricus augustus2 July records across all years
Inocybe mixtilis2 July records across all years
Collared Fibrecap Inocybe cincinnata2 July records across all years
Usually recorded in August here:
Inky Mushroom Agaricus placomyces2 August records across all years
Purplepore Bracket Trichaptum abietinum2 August records across all years- Ochre-Banded Conk Fomitopsis ochracea2 August records across all years
West Coast Reishi Ganoderma oregonense2 August records across all years
Brown Cubical Rot Laetiporus conifericola2 August records across all years
Usually recorded in September here:
- Corn-Silk Fiberhead Pseudosperma sororium3 September records across all years
- Dirty Tricholoma Tricholoma terreum2 September records across all years
Pleurotus cornucopiae2 September records across all years
Leucocoprinus leucothites2 September records across all years- Turkeytail Trametes versicolor2 September records across all years
- Northern Red Belt Fomitopsis mounceae2 September records across all years
Usually recorded in October here:
Bicoloured Deceiver Laccaria bicolor7 October records across all years
Pretty Pinkgill Entoloma formosum6 October records across all years
Limacella delicata6 October records across all years- Corn-Silk Fiberhead Pseudosperma sororium6 October records across all years
Crab Brittlegill Russula xerampelina6 October records across all years- Cinnamon Fiberhead Inocybe cinnamomea5 October records across all years
Lactarius fumosus4 October records across all years
Felt-Ringed Agaricus Agaricus hondensis4 October records across all years- Entoloma decolorans3 October records across all years
- Entoloma fuligineomarginatum3 October records across all years
Cystodermella granulosa3 October records across all years- Inocybe mixtilis3 October records across all years
Usually recorded in November here:
Western Amethyst Laccaria Laccaria amethysteo-occidentalis3 November records since 2011
Questionable Stropharia Stropharia ambigua3 November records since 2011
California Flat-Top Agaricus Agaricus deardorffensis2 November records since 2011
Fly Agaric Amanita muscaria2 November records since 2011- Northern Red Belt Fomitopsis mounceae2 November records since 2011
Jelly Rot Phlebia tremellosa2 November records since 2011
Usually recorded in December here:
- Coprinellus heptemerus3 December records across all years
- Coprinus velox3 December records across all years
Brown-Staining Cheese Polypore Fuscopostia fragilis2 December records across all years
Earpick Fungus Auriscalpium vulgare2 December records across all years
Most-recorded species
| # | Species | Records |
|---|---|---|
| 1 | 26 | |
| 2 | 24 | |
| 3 | 20 | |
| 4 | 18 | |
| 5 | 18 | |
| 6 | 18 | |
| 7 | 18 | |
| 8 | 17 | |
| 9 | 16 | |
| 10 | 16 | |
| 11 | 15 | |
| 12 | 15 | |
| 13 | 14 | |
| 14 | 13 | |
| 15 | 12 |
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: Nov, Oct, Jul.
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 9 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 16, 2026Northern Red Belt Fomitopsis mounceaein San Juan County, WA · iNaturalist photo, research grade · original record
- 2Jul 17, 2026Turkeytail Trametes versicolornear Friday Harbor, WA · iNaturalist photo, research grade · original record
- 3
Apr 4, 2026Verdigris Navel Arrhenia chlorocyaneanear Friday Harbor, WA · iNaturalist photo, research grade · original record - 4Nov 30, 2025Fly Agaric Amanita muscariain San Juan County, WA · iNaturalist photo, research grade · original record
- 5
Sep 21, 2025Serpula himantioidesin Obstruction Pass State Park, WA · iNaturalist photo, research grade · original record - 6Aug 25, 2025Northern Red Belt Fomitopsis mounceaein San Juan County, WA (location blurred by the observer) · iNaturalist photo, research grade · original record
- 7Aug 25, 2025West Coast Reishi Ganoderma oregonensein San Juan County, WA · iNaturalist photo, research grade · original record
- 8Jul 24, 2025Northern Red Belt Fomitopsis mounceaein San Juan Island National Historical Park, WA · iNaturalist photo, research grade · original record
- 9Jul 8, 2025Northern Red Belt Fomitopsis mounceaein San Juan County, WA · iNaturalist photo, research grade · original record
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How we built this page
2,074 records of mushrooms, shelf fungi and polypores (class Agaricomycetes) that fall inside this county's Census boundary. Licenses: 2,001 CC0 and 73 CC BY 4.0. See about the data for the full citation.