Lycoperdon pyriforme

Apioperdon pyriforme

Synonym: Lycoperdon pyriforme

Family: Agaricaceae

Pear-shaped Puffball (Apioperdon pyriforme, still commonly encountered as Lycoperdon pyriforme) is a small, wood-growing puffball that appears on decaying logs, stumps, buried wood, and moss-covered woody surfaces. Young fruiting bodies are pale and rounded to pear-shaped; with age they turn tan to brown and release spores through a small opening at the top.

For representative images and visual context, see the page: Pear-shaped Puffball in the Gallery section.

Description

Apioperdon pyriforme is recognized by:

  • Growth form: small puffball, rounded to pear-shaped
  • Fruiting body: usually clustered, with a rounded upper spore case and a narrower sterile base
  • Surface: white to cream when young, becoming yellow-brown to darker brown with age
  • Texture: covered with fine warts or granules that may wear away, leaving a dotted or pitted surface
  • Apex: mature fruiting bodies develop a small pore-like opening for spore release
  • Interior (gleba): firm and white when young, later becoming olive-brown to brown and powdery
  • Attachment: often connected to decaying wood by white mycelial cords or rhizomorphs

The fruiting bodies often appear in groups, sometimes scattered across a mossy log and sometimes clustered tightly together. Mature specimens may look like small brown bulbs set into the moss, especially after the outer granules have weathered away.

Substrate and Habitat

Typical substrates and settings include:

  • Decaying wood, including logs, stumps, fallen branches, and buried wood
  • Moss-covered logs or tree bases where decomposing wood is present beneath the moss
  • Moist, shaded woodland habitats
  • Hardwood or conifer wood, though local observations may be associated with oak or mixed woodland debris

Notes may include:

  • Often appears to grow from moss or bark, but the food source is decaying wood or woody organic matter
  • Commonly fruits in late summer through fall
  • Older fruiting bodies can persist after the main fruiting period, especially in cool, damp weather

Identification

Key features for field diagnosis:

  • Substrate: growing from decaying wood or wood-rich moss, not directly from soil
  • Shape: rounded to pear-shaped puffballs with a narrower base
  • Surface: fine granular or warted texture, not long-spined
  • Interior: solid white when young; olive-brown and powdery when mature
  • Spore release: mature fruiting bodies release brown spores through a small apical pore
  • Rhizomorphs: white cords at the base may be visible where the puffball attaches to wood

This species is especially useful to recognize by its combination of puffball form and wood substrate. Common Puffball (Lycoperdon perlatum) can look similar, but it more often grows on soil and has more conspicuous conical spines. Earthballs (Scleroderma species) are tougher, often have a thicker rind, and develop a dark interior rather than a uniform white puffball interior. Very young Amanita buttons can also resemble puffballs externally; a vertical cut should show whether gills, a cap, or stem tissues are forming inside.

Edibility and Caution

Some field guides list pear-shaped puffballs as edible only when young and when the interior is completely white and uniform. This page is for identification notes, not a foraging recommendation.

Do not use any puffball for food if:

  • The inside is yellow, olive, brown, purple, or powdery
  • The inside shows developing gills, a cap, stem tissue, or any layered structure
  • The specimen is old, waterlogged, insect-damaged, or uncertain
  • The substrate, identity, or condition cannot be confirmed

Ecology and Notes

  • Saprobic, helping break down decaying wood and return nutrients to the forest floor
  • Often appears after damp weather in shaded woodland settings
  • The mossy setting can make the fruiting bodies look as though they are growing from living bark, but the fungus is associated with decomposing woody material
  • Mature specimens release spores by puffing through the apical pore when touched, struck by raindrops, or disturbed by falling debris
  • Current taxonomy often places the species as Apioperdon pyriforme, while Lycoperdon pyriforme remains a widely used older name and useful search term

References

  • Index Fungorum name record: Apioperdon pyriforme
    https://www.indexfungorum.org/Names/NamesRecord.asp?RecordID=819914

  • MushroomExpert.com: Apioperdon pyriforme
    https://mushroomexpert.com/fungionwood/puffball%20and%20cushion/species%20pages/Apioperdon%20pyriforme.htm

  • Minnesota Seasons: Pear-shaped Puffball
    https://www.minnesotaseasons.com/Fungi/Pear-shaped_Puffball.html

  • iNaturalist taxon page
    https://www.inaturalist.org/taxa/972793-Apioperdon-pyriforme