Saddle-shaped False Morel Paragyromitra — saddle-shaped fungi of PNW conifer forests
Paragyromitra infula, the saddle-shaped false morel (also called the hooded false morel), is a distinctive ascomycete found on rotting conifer wood and hard-packed ground throughout Pacific Northwest forests. Its cap forms one or two, occasionally three, sharp-tipped lobes that drape over a hollow, whitish stipe — a silhouette unlike any true morel or brain-shaped Gyromitra. It fruits primarily in fall, making it one of the few false morel relatives active after the spring season ends.
Until recently this species was classified as Gyromitra infula, but a 2023 molecular and morphological study by Wang & Zhuang established the genus Paragyromitra to reflect its distinct evolutionary lineage. Two species occur in the PNW: P. infula and the closely related P. ambigua, which runs smaller on average and shows a stronger violet tinge, especially when fresh (Harmaja).
Scout Conifer Habitat on Forayz
Use forest type overlays and satellite basemaps to find conifer stands with downed wood — prime territory for hooded false morels in fall.
Identification
| Feature | Description |
|---|---|
| Cap | Saddle-shaped, usually with 2 (occasionally 3) sharp-tipped lobes, 3–10 cm across. Irregularly folded, smooth to slightly wrinkled. Lobes drape over and partially free from the stipe. |
| Color | Yellow-brown to orange-brown when fresh, darkening to red-brown or blackish brown with age. Underside paler, cream to buff. |
| Stipe | 3–8 cm tall, hollow, whitish to tan, smooth or slightly furrowed. Sometimes laterally compressed rather than round. |
| Flesh | Thin, brittle, whitish. Hollow throughout — stipe is a single empty chamber. |
| Odor | Not distinctive. |
| Spores | Elliptical, smooth, hyaline. Ascospores produced in asci (Ascomycota). |
| Substrate | Rotting conifer wood (stumps, buried roots, downed logs), especially spruce, or hard-packed ground near conifers. |
| Season | Late summer through fall, peaking October–November. Occasional spring records. |
The saddle shape with sharp lobes is the giveaway
While brain-shaped Gyromitra species have convoluted, wrinkled caps, Paragyromitra infula has a distinctly saddle-shaped cap with pointed, angular lobes — typically two main lobes forming a mitre or bishop’s hat shape. The lobes have sharp tips rather than rounded folds. Combined with the fall fruiting season, this silhouette separates it from every other false morel in the PNW.
Species in the PNW: P. infula vs. P. ambigua
Two Paragyromitra species are found in Oregon and Washington. Cap shape is similar in both; the more reliable field differences are color, size, and habitat.
| Feature | P. infula | P. ambigua |
|---|---|---|
| Common name | Saddle-shaped false morel | Changeable false morel |
| Cap shape | Saddle-shaped, usually 2 (occasionally 3) sharp lobes | Similar shape; hymenium may become more wrinkled with age |
| Cap size | 3–10 cm across | Smaller on average, to about 7 cm across |
| Color | Yellow-brown to orange-brown, darkening to red-brown with age | Red-brown to dark red-brown, often with a violet tinge; darker overall, sometimes blackish when dry |
| Stipe | Whitish to pale pinkish cream, sometimes faintly purple-brown | Similar, but often with a stronger violet tint, especially when fresh |
| Habitat | Rotting conifer wood (especially spruce) or ground near conifers | Favors pine specifically, often on bare sandy soil along roads and trails rather than directly on wood |
| Frequency | Far more commonly reported in the PNW | Far less frequently recorded |
Paragyromitra ambigua is best told from P. infula by color and habitat rather than cap shape, which is similar in both. It tends to be darker red-brown with a violet tinge, especially when fresh, runs smaller on average, and favors pine specifically — often on bare sandy soil along roads and trails rather than growing directly on wood (Harmaja). Macroscopic features alone often aren’t conclusive; the more reliable distinction is under the microscope, where P. ambigua‘s spores are larger and apiculate (with small projecting tips) and P. infula‘s are smaller and lack apiculi (Harmaja).
Photo: Alan Rockefeller / iNat / CC BY
Habitat & Where to Look
Both Paragyromitra species are saprobic, feeding on decaying wood rather than forming mycorrhizal partnerships with living trees. P. infula favors general conifer habitat — records come from Douglas-fir, hemlock, spruce, and true fir stands, with a particular association with spruce (MycoMatch). P. ambigua leans toward pine specifically, often on bare sandy soil rather than directly on wood (Harmaja).
Key substrates: Rotting stumps, buried roots, and downed conifer logs for P. infula; bare or sandy, hard-packed ground along trail edges and road cuts near pine for P. ambigua.
Elevation: Found from lowland forests to mid-elevation mountain stands. Not strongly tied to snowmelt zones like spring-fruiting Gyromitra species.
Disturbed sites: Trail margins, road cuts, old logging roads, and forest clearings seem to produce reliable fruitings — anywhere that exposes rotting wood or compacted soil near conifers.
Season & Timing
Paragyromitra is primarily an autumn fungus in the PNW, with a sharp peak in October and November as fall rains arrive and temperatures drop. This contrasts with the spring-fruiting Gyromitra species that follow snowmelt. A small number of spring records exist, but the overwhelming majority of sightings come from the fall season.
Based on 714 iNaturalist observations of P. infula from Oregon and Washington
November alone accounts for nearly half of all observations. If you want to find fresh saddle-shaped false morels, aim for late October through mid-November.
Track Fall Mushroom Season on Forayz
Use environmental layers to monitor soil moisture and precipitation across the PNW — key indicators for when fall fungi like Paragyromitra will start fruiting.
Edibility & Safety
Treat as toxic — do not eat
Both Paragyromitra infula and P. ambigua have long been listed as poisonous, grouped with Gyromitra esculenta as likely gyromitrin producers. Gyromitrin breaks down into monomethylhydrazine (MMH), a potent toxin that can cause liver failure and death.
A 2023 chromatography survey of the false-morel family found no detectable gyromitrin in either P. infula or P. ambigua, while confirming it in the G. esculenta group (Dirks et al., Mycologia 115). This challenges the historical toxicity attribution, but older poisoning reports for “Gyromitra infula” and “G. ambigua” predate molecular species confirmation, and a negative chromatography result in one study doesn’t rule out other toxic compounds or batch-to-batch variation.
The prudent approach: Continue to treat both species as toxic. The genus split and the gyromitrin finding are both recent, and the safety profile isn’t fully understood. Neither is an edible species.
Similar Species
The saddle-shaped cap and fall fruiting season make Paragyromitra fairly distinctive, but several other genera share general morphology or habitat:
- Gyromitra species (False Morels): Brain-shaped or convoluted caps rather than saddle-shaped. Most PNW Gyromitra fruit in spring near snowmelt, not fall. Paragyromitra was recently separated from Gyromitra based on molecular evidence — the two are related but evolutionarily distinct.
- Helvella species (Elfin Saddles): Also saddle-shaped, but typically smaller, thinner-fleshed, and often gray, black, or white rather than reddish brown. Stipes are frequently ribbed or fluted. Helvella and Paragyromitra can overlap in habitat and season — cap color and lobe sharpness are the best field marks.
- Verpa and Morchella (Morels & Verpas): Spring-fruiting with pitted or wrinkled caps that are fundamentally different in structure. No saddle shape. Unlikely timing overlap with Paragyromitra.
Sources: Mushrooms of Cascadia (Siegel & Schwarz, 2024); MycoMatch (© Ian Gibson), a compilation of published descriptions through which most other field-guide authors named here are quoted; iNaturalist observations.