Each April, the Sierra Nevada draws crowds up from the California lowlands in search of one of the more difficult to find wild mushrooms. Morels, the common name for every species in the genus Morchella, begin appearing in mountain conifer forests, where many morel species form associations with native conifers. They are famous for fruiting in great abundance after fires, and many of our recent megafires have sent surges of spring tourists hunting for them among the blackened trees. That abundance does not last. A few years after a fire the boom goes bust, and morels can nearly vanish from a burn, especially where fire killed a high proportion of the mature trees.
The natural morels fruit without fire
What many new morel hunters do not realize is that a healthy forest is often the more reliable producer, and over the long term the more productive one. Some species are strongly tied to fire, but the Sierra has two species, Morchella snyderi and Morchella tridentina, known as natural morels, a term that reflects their habit of fruiting with only minimal disturbance. They turn up along trails, roads, next to rocks or logs, or anywhere the soil sees a little compaction. M. snyderi, our natural black morel, is famously associated with white fir (Abies concolor) and other conifers. M. tridentina, the natural blond morel, grows with sugar pine (Pinus lambertiana) and other conifers. Both can be found along washes, in campgrounds, and most importantly where mastication or forest thinning has taken place. Fuel breaks, thinning, prescribed burns, and mastication of heavy underbrush all tend to create excellent morel habitat.
Forest management makes for a more sustainable harvest
That is the point worth sitting with: catastrophic wildfire risk reduction work can lead to a more sustainable morel harvest. Most of these projects leave an overstory of mature trees intact, exactly what the natural morels need to keep fruiting year after year. So many of the people who chase wildfires for morels would do better to stop chasing fires and start pushing for prescribed fire and mastication instead.
Before you eat any morel
Morels are not a mushroom you can eat raw. The North American Mycological Association notes that even true morels can cause illness when they are eaten raw or not thoroughly cooked. Cook them all the way through, eat a small portion the first time you try a species, and identify every specimen individually rather than sorting a full basket by eye at the end of the day.
False morels share the season and the ground
The false morels, genus Gyromitra, fruit in the same Sierra window and often in the same habitat. Several species, including Gyromitra montana, Gyromitra gigas and Gyromitra californica, contain gyromitrin, which hydrolyses to monomethylhydrazine, a volatile and highly toxic compound that is also a known carcinogen. Because the toxin is volatile, the dose in any given collection is unpredictable, and the North American Mycological Association describes the margin between a safe dose and a lethal one as very slim. Some species of Verpa and Helvella can also make people ill. Treat anything you pick as a false morel until you have ruled it out.
Three checks separate a true morel from the common look alikes:
- Slice it lengthwise. A true Morchella is completely hollow from the tip of the cap to the base of the stem. A Gyromitra is chambered or stuffed with cottony tissue.
- Look at the cap surface. A true morel is pitted and ridged like a honeycomb. A Gyromitra is wrinkled, lobed, and often described as brain like.
- Check where the cap attaches. On a true morel the lower edge of the cap is fused to the stem. On a Verpa the cap hangs free from the top like a skirt.
Permits and where you are allowed to collect
Collecting on national forest land is not automatically free. The Eldorado National Forest states that collecting and removing forest products requires a permit, and its definition of forest products includes edible material. Allowances, personal use limits, and seasonal closures vary between forests and change from year to year, so contact the district office before you go rather than afterward. Collecting is restricted or prohibited in national parks, and the rules differ by unit. On private land you need the owner's permission.
Frequently Asked Questions
Do morels only grow after wildfires?
No. Some morel species are strongly tied to fire and can fruit in great abundance after a burn, but that boom goes bust within a few years, especially where fire killed many of the mature trees. The Sierra also has two natural morels, Morchella snyderi and Morchella tridentina, that fruit with only minimal disturbance in a healthy forest, and over the long term they are often the more reliable producers.
Does forest thinning or prescribed fire help morels?
Yes. Fuel breaks, thinning, prescribed burns, and mastication of heavy underbrush all tend to create excellent morel habitat. Because most of these projects leave an overstory of mature trees intact, they support the natural morels that need those trees to keep fruiting year after year.
Which trees do the Sierra's natural morels grow with?
Morchella snyderi, the natural black morel, is famously associated with white fir (Abies concolor) and other conifers. Morchella tridentina, the natural blond morel, grows with sugar pine (Pinus lambertiana) and other conifers. Both turn up along trails, roads, washes, and campgrounds, and especially where thinning or mastication has taken place.
Can you eat morels raw?
No. True morels contain compounds that cause gastrointestinal illness when the mushrooms are raw or undercooked, and the North American Mycological Association lists morels among the species that can upset people if they are not thoroughly cooked. Cook them through, and try a small amount the first time.
How do I tell a true morel from a false morel?
Slice it from the tip of the cap to the base of the stem. A true morel is completely hollow inside and its cap is pitted like a honeycomb with the lower edge fused to the stem. A false morel in the genus Gyromitra is chambered or filled with cottony tissue and has a wrinkled, lobed, brain like cap. Gyromitra species contain gyromitrin, which converts to monomethylhydrazine and can be fatal, so if the inside is not hollow, do not eat it.
Do I need a permit to collect morels in the Sierra Nevada?
On national forest land, yes. The Eldorado National Forest requires a permit to collect and remove forest products, and edible material is on that list. The specific allowances change between forests and between years, so check with the district office first. Collecting is restricted or prohibited in national parks, and private land always requires the owner's permission.
- North American Mycological Association, mushroom poisoning syndromesReference on gyromitrin, monomethylhydrazine, and the species involved in false morel poisoning.
- Eldorado National Forest, permitsForest product permits, including edible material, for the national forest closest to Placerville.