Puffball Mushrooms Round, stemless fungi that release spores in dusty clouds
Puffballs are the simplest mushrooms to recognize: round or pear-shaped, with no cap, no stem (or just a rudimentary base), and no gills or pores. Spores develop inside the fruitbody in a mass called the gleba. When mature, the outer skin opens or tears, and the powdery spore mass is released — often in a visible “puff” when the fruitbody is bumped or struck by rain.
Several puffball species are good edibles when young and the interior is firm and pure white. The critical rule: always slice them in half before eating. If the interior shows any color, texture, or hint of internal structure (gills, a developing cap), it’s not a puffball — it could be a developing Amanita egg, which includes deadly species. Earthballs (Scleroderma) are also puffball-like but toxic.
Scout Puffball Habitat on Forayz
Giant puffballs favor open grasslands and sagebrush on the east side. Gem-studded puffballs prefer forest trails and roadsides. Use ecoregion and public land layers on Forayz to locate productive habitat. Environmental layers are free for all users.
Notable PNW Species
Gem-Studded Puffball — Lycoperdon perlatum
The most common puffball in PNW forests. 1–5 cm across, 1–7 cm tall, pear-shaped, covered in conical spines (the “gems”) that fall off leaving a net-like pattern on the surface. Prefers disturbed ground — trail edges, roadsides, logging roads — but also found in duff and on well-decayed wood. Widespread and common, fruiting in fall. Edible when the interior is firm and pure white. The spines easily distinguish it from earthballs.
Western Giant Puffball — Calvatia booniana
One of the largest mushrooms in the PNW. 20–50 cm across, round to cushion-shaped. Grows in open forests, grasslands, and sagebrush scrub in drier east-side habitats. Absent from wet western forests. Fruits in late spring and summer. Edible and very good when young — firm, pure white interior slices like bread. Only eat specimens with no discoloration whatsoever.
Smoky Puffball — Calvatia fumosa
Medium-sized (5–15 cm), grayish-brown, with a smooth to slightly cracked surface. Named for its distinctly unpleasant odor when mature. Found in mountain meadows and open conifer forests. The wretched smell discourages investigation — edibility unknown.
Bovista / Tumbling Puffballs
Small (2–5 cm), round, often detaching from the substrate when mature and tumbling in the wind to disperse spores. Found in grasslands and open areas. Several species occur in the PNW. Generally edible when young and white inside, but too small to be worth collecting.
Earthstar — Geastrum saccatum
Puffball-like center surrounded by a star-shaped outer layer that peels back, lifting the spore sac off the ground. 2–5 cm across when open. Found in duff under conifers. Striking and unmistakable in form. Not typically eaten. Several Geastrum species occur in the PNW.
Dye-Maker’s False Puffball — Pisolithus arhizus group
Round to pear-shaped, 5–15 cm, with a dark, granular interior (like packed fish eggs rather than a smooth gleba). Mycorrhizal with oaks and pines. The powdery spore mass is extremely hydrophobic and can cause fits of sneezing. Inedible. Used by natural dyers.
Always Slice Puffballs in Half
Before eating any puffball, cut it vertically through the center. The interior must be uniformly white and firm with no internal structure visible — no developing cap, gills, stem, or colored zones. A developing Amanita button (egg stage) can look like a small puffball on the outside but will show the outline of a mushroom inside. Amanita phalloides and A. ocreata are deadly.
Earthballs (Scleroderma) are also toxic puffball lookalikes — they have a thick, tough rind and a dark, purplish-black interior even when young. If in doubt, don’t eat it.
The White Interior Rule
Any discoloration inside a puffball means it’s past its prime for eating. Yellow, olive, brown, or purple tints indicate spore maturation has begun. Only eat puffballs that are uniformly white and firm when sliced. This is a simple, reliable safety check.
Find East-Side Habitat for Giant Puffballs
Calvatia booniana grows in the drier climates east of the Cascades. Use the ecoregion layer on Forayz to explore sagebrush-steppe and dry forest zones where this species fruits in late spring and early summer.
Habitat & Season
Puffballs occupy diverse habitats. Lycoperdon perlatum is a forest species found on trail edges, roadsides, and disturbed ground throughout western and eastern Cascadia. Calvatia booniana is a grassland and open-country species confined to east-side habitats. Bovista species prefer open meadows and lawns. Earthstars grow in forest duff. Most PNW puffballs fruit in fall, but the giant puffball (C. booniana) is a late spring to summer species. Old, spent fruitbodies of Lycoperdon persist into winter.