Mushrooms in Johnson County, Iowa
Updated October 2026 · from open GBIF records
1,837mushroom records
440species recorded
Sepbusiest month
1,837 records since 1883 (399 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:
Red Tree Brain Fungus Peniophora rufa2 January records across all years
Usually recorded in February here:
Crowded Parchment Stereum complicatum2 February records across all years
Hairy Bracket Trametes hirsuta2 February records across all years
Turkeytail Trametes versicolor2 February records across all years
Usually recorded in March here:
- Red Tree Brain Fungus Peniophora rufa6 March records across all years
Ceramic Parchment Xylobolus frustulatus4 March records across all years
Sistotrema brinkmannii4 March records across all years- Tulasnella pruinosa4 March records across all years
- Exidiopsis opalea4 March records across all years
Amber Jelly Exidia recisa3 March records across all years
Ochre Spreading Tooth Steccherinum ochraceum2 March records across all years
Common Porecrust, Split Gill Fungus Schizophyllum commune2 March records across all years
Tulasnella violea2 March records across all years
False Turkey-Tail Stereum ostrea2 March records across all years- Turkeytail Trametes versicolor2 March records across all years
Usually recorded in April here:
- Exidiopsis molybdea12 April records across all years
- Tulasnella violea8 April records across all years
- Ceramic Parchment Xylobolus frustulatus4 April records across all years
Black Witch's Butter Exidia glandulosa4 April records across all years- Exidiopsis opalea3 April records across all years
- Red Tree Brain Fungus Peniophora rufa3 April records across all years
- Sistotrema brinkmannii3 April records across all years
- Basidiodendron cinereum3 April records across all years
- Tulasnella violacea3 April records across all years
- Tulasnella pruinosa3 April records across all years
- Amber Jelly Exidia recisa2 April records across all years
Hydnocristella himantia2 April records across all years
Usually recorded in May here:
Golden Oyster Mushroom Pleurotus citrinopileatus4 May records since 2011- Turkeytail Trametes versicolor3 May records since 2011
Dryad's Saddle Cerioporus squamosus2 May records since 2011- Pleurella microspora2 May records since 2011
Wine Roundhead Stropharia rugosoannulata2 May records since 2011
Usually recorded in June here:
Botryobasidium pruinatum6 June records across all years
Orchard Tooth Sarcodontia setosa5 June records across all years- Radulomyces cremoricolor5 June records across all years
- Sistotrema subtrigonospermum5 June records across all years
- Golden Oyster Mushroom Pleurotus citrinopileatus5 June records across all years
- Ceramic Parchment Xylobolus frustulatus4 June records across all years
Crown-Tipped Coral Artomyces pyxidatus4 June records across all years
Common Bird's Nest Crucibulum laeve3 June records across all years- Common Porecrust, Split Gill Fungus Schizophyllum commune3 June records across all years
Climacodon pulcherrimus3 June records across all years
Grisette Amanita vaginata3 June records across all years- Rhizoctonia obscura3 June records across all years
Usually recorded in July here:
Fragrant Black Trumpet Craterellus foetidus4 July records since 2011
Russula pulverulenta3 July records since 2011
Inocybe dulciolens3 July records since 2011
False Turkeytail Stereum lobatum3 July records since 2011
Black-Stalked Marasmius Tetrapyrgos nigripes3 July records since 2011
Northern Cinnabar Polypore Trametes cinnabarina2 July records since 2011- Turkeytail Trametes versicolor2 July records since 2011
Bradley Lactifluus volemus2 July records since 2011
Yellowing Curtain Crust Stereum subtomentosum2 July records since 2011
Loweomyces fractipes2 July records since 2011- Golden Oyster Mushroom Pleurotus citrinopileatus2 July records since 2011
- False Turkey-Tail Stereum ostrea2 July records since 2011
Usually recorded in August here:
Bleeding Oak Crust Stereum gausapatum5 August records since 2011
Byssomerulius incarnatus5 August records since 2011- Golden Oyster Mushroom Pleurotus citrinopileatus3 August records since 2011
- False Turkeytail Stereum lobatum3 August records since 2011
Common Puffball Lycoperdon perlatum3 August records since 2011- False Turkey-Tail Stereum ostrea3 August records since 2011
- Turkeytail Trametes versicolor3 August records since 2011
Purple-And-White Deceiver Laccaria ochropurpurea2 August records since 2011
Chicken Of The Woods Laetiporus sulphureus2 August records since 2011
Pholiota polychroa2 August records since 2011
Orange Pinwheel Marasmius siccus2 August records since 2011- Crowded Parchment Stereum complicatum2 August records since 2011
Usually recorded in September here:
Late Fall Polypore Ischnoderma resinosum4 September records since 2011- Turkeytail Trametes versicolor3 September records since 2011
- Golden Oyster Mushroom Pleurotus citrinopileatus3 September records since 2011
Lactarius yazooensis2 September records since 2011
Jelly Rot Phlebia tremellosa2 September records since 2011- Purple-And-White Deceiver Laccaria ochropurpurea2 September records since 2011
- False Turkey-Tail Stereum ostrea2 September records since 2011
- Common Puffball Lycoperdon perlatum2 September records since 2011
Jack O Lantern Omphalotus illudens2 September records since 2011
Coral Tooth Hericium coralloides2 September records since 2011- Yellowing Curtain Crust Stereum subtomentosum2 September records since 2011
Usually recorded in October here:
Corkstar Puffball Mycenastrum corium3 October records since 2011- Jelly Rot Phlebia tremellosa3 October records since 2011
- Turkeytail Trametes versicolor3 October records since 2011
- Chicken Of The Woods Laetiporus sulphureus3 October records since 2011
- False Turkeytail Stereum lobatum3 October records since 2011
Honey Fungus Armillaria mellea2 October records since 2011
Wood Blewit Lepista nuda2 October records since 2011
Giant Puffball Calvatia gigantea2 October records since 2011
The Granulated Bolete Suillus granulatus2 October records since 2011
Golden Pholiota Pholiota aurivella2 October records since 2011- Crowded Parchment Stereum complicatum2 October records since 2011
Usually recorded in November here:
Lopharia cinerascens7 November records across all years- Black Witch's Butter Exidia glandulosa5 November records across all years
- Stump Puffball Lycoperdon pyriforme5 November records across all years
- False Turkey-Tail Stereum ostrea4 November records across all years
- Ochre Spreading Tooth Steccherinum ochraceum4 November records across all years
- Sistotrema brinkmannii3 November records across all years
- Pterulicium ulmi3 November records across all years
- Phlebia pallida2 November records across all years
Rosy Crust Peniophora incarnata2 November records across all years
Athelia Fungus Athelia epiphylla2 November records across all years- Exidiopsis opalea2 November records across all years
Crystal Brain Fungus Myxarium nucleatum2 November records across all years
Usually recorded in December here:
- Acanthophysium oakesii3 December records across all years
- Turkeytail Trametes versicolor2 December records across all years
⚠ 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 | 33 | |
| 2 | 28 | |
| 3 | 26 | |
| 4 | 22 | |
| 5 | 20 | |
| 6 | 20 | |
| 7 | 19 | |
| 8 | 18 | |
| 9 | 18 | |
| 10 | 18 | |
| 11 | 17 | |
| 12 | 17 | |
| 13 | 16 | |
| 14 | 15 | |
| 15 | 15 |
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: Sep, Oct, Aug.
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.
- 1Oct 2, 2026Jack O Lantern Omphalotus illudensnear Iowa City, IA · iNaturalist photo, research grade · original record
- 2Aug 30, 2026Jack O Lantern Omphalotus illudensnear Coralville, IA · iNaturalist photo, research grade · original record
- 3Aug 30, 2026Byssomerulius incarnatusnear Coralville, IA · iNaturalist photo, research grade · original record
- 4
Aug 17, 2026Peeling Puffball Lycoperdon marginatumnear North Liberty, IA · iNaturalist photo, research grade · original record - 5Jun 29, 2026Wine Roundhead Stropharia rugosoannulatanear Iowa City, IA · iNaturalist photo, research grade · original record
- 6Jun 26, 2026Golden Oyster Mushroom Pleurotus citrinopileatusnear Iowa City, IA · iNaturalist photo, research grade · original record
- 7Jun 26, 2026Golden Oyster Mushroom Pleurotus citrinopileatusnear Iowa City, IA · iNaturalist photo, research grade · original record
- 8May 25, 2026Golden Oyster Mushroom Pleurotus citrinopileatusnear Iowa City, IA (location blurred by the observer) · iNaturalist photo, research grade · original record
- 9May 12, 2026Golden Oyster Mushroom Pleurotus citrinopileatusnear Iowa City, IA · iNaturalist photo, research grade · original record
- 10May 9, 2026Golden Oyster Mushroom Pleurotus citrinopileatusnear Coralville, IA · 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
1,837 records of mushrooms, shelf fungi and polypores (class Agaricomycetes) that fall inside this county's Census boundary. Licenses: 1,436 CC0 and 401 CC BY 4.0. See about the data for the full citation.