Fauna
Fungus

Western Giant Puffball

Calvatia booniana

Also known as Western Puffball, Sculpted Puffball

Western giant puffballs stand out among fungi for their colossal fruiting bodies adorned with polygonal, mosaic-like scales that resemble cracked clay. Found across the arid rangelands, sagebrush steppes, and high-altitude pastures of western North America, they function as saprobes, quietly recycling nutrients from decaying organic soil matter. As the fruiting body matures, the pale internal gleba breaks down into a powdery mass of olive-brown spores released when breezes or wandering animals rupture the papery outer skin.

DecomposerArid HabitatSpore Disperser
Western Giant Puffball reference1 / 7
(c) Davide Puddu, some rights reserved (CC BY), uploaded by Davide Puddu · cc-by
—observations
—countries
—peak records
Not EvaluatedConservation statusIUCN Red List categoriesLCNTVUENCREWEXNot Evaluated — not placed on the risk ladderRed List categories, explained →
Key facts
Diet & preySaprobic (decomposing dead plant material and soil organic matter)
Predators
  • Fungus Gnat Larvae
  • Small Rodents
  • Slugs
ThreatsHabitat degradation from intense overgrazing, urbanization, and land development
HabitatsSagebrush steppes, dry open grasslands, juniper woodlands, and montane pastures
Life spanPerennial underground mycelium; fruiting bodies persist several weeks to months
Classification
  1. OrderAgaricales
  2. FamilyLycoperdaceae
  3. GenusCalvatia
  4. SpeciesCalvatia booniana
Range & activity
Range data is not available yet.
Safe observation
Interaction riskLow
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is low
Many edible mushrooms have toxic look-alikes; never eat wild fungi based on app identification alone.
Responsible observation
  • Spore Release: Gently tap mature, weathered specimens to observe the cloud of dry spores dispersing into the wind.
  • Examine the Surface: Note the distinctive polygonal warts on young specimens, which differentiate it from smoother eastern puffballs.
  • Field Safety: Leave undisturbed in natural habitats, as dried fungal dust can cause mild respiratory irritation if directly inhaled.
Related species
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