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Tuberous Polypore

Tuberous Polypore

Polyporus tuberaster

Photo: Björn S...

Habitat

Woodland

This species grows on the fallen twigs and dead branches of deciduous trees, specifically hardwood species like beech, hazel, and gorse. It can also be found in mixed conifer and oak forests. While often seen on dead wood, it frequently fruits from a large, rubbery, underground mass called a sclerotium that can range in size from a golf ball to a soccer ball. It typically appears as solitary specimens or in small clusters or tufted groups.

Photos

Appearance

Cap
Measuring 2–12 cm across, it varies from semicircular to circular or funnel-shaped. The surface is yellow-cream, light brown, or grayish and is covered in concentrically arranged, dark, pointed scales or tufts of hair.
Stem
1–10 cm long and 0.5–4 cm thick, it can be central, off-center, or lateral. It is pale cream to light brown, often featuring a hairy or roughened base and sometimes forking or branching.
Pores
The surface is white to ochraceous-cream with angular, polygonal, or elongated pores that typically have a toothed appearance.
Tubes
Shallow and pale-colored, the tube layer runs significantly down the stem.
Flesh
White, thick, and firm with a texture ranging from elastic to tough or leathery.
Sclerotium
A notable underground mass of hard, rubbery tissue, ranging from the size of a golf ball to a soccer ball, with a dark wrinkled exterior and marbled interior.
Spore print
White.

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Edibility

Not edible

Known for its elastic, tough, rubbery, or leathery flesh, this species is generally considered inedible. It has a mild to indistinct taste and a mushroomy to indistinct odor. It may be confused with the larger Dryad’s Saddle, which forms tiers of overlapping shelves on hardwoods, or Polyporus decurrens, which has a shorter, off-center stem and grows directly from wood.

Misidentification can be fatal. Never eat a mushroom unless you're 100% sure. This information may be inaccurate. Always consult multiple sources.

Nutrient Source

Saprotrophic

It obtains nutrients by decomposing dead or decaying hardwood, often growing from buried branches or a tuber-like structure.

Common Names

Danish
Knoldet stilkporesvamp
Dutch
Franjeporiezwam
English
Tuberous Polypore
French
Polypore moucheté
Norwegian Bokmål
knollstilkkjuke
Norwegian Nynorsk
knollstilkkjuke
Spanish
licia, políporo blando, poliporo de forquignon
Swedish
stenticka
Ukrainian
Трутовик бульбастий
Welsh
Cyfrwy Cnapwreiddiog

Synonyms

  • Boletus tuberaster
  • Boletus tuberaster
  • Ceriomyces tuberaster
  • Cerioporus boucheanus
  • Cerioporus forquignonii
  • Favolus boucheanus
  • Favolus ciliaris
  • Fungus tuberaster
  • Leucoporus forquignonii
  • Leucoporus lentus
  • Melanopus coronatus
  • Melanopus forquignonii
  • Melanopus forquignonii
  • Melanopus lentus
  • Mycelithe fungifera
  • Polyporellus boucheanus
  • Polyporellus tuberaster
  • Polyporus boucheanus
  • Polyporus boucheanus
  • Polyporus coronatus
  • Polyporus floccipes
  • Polyporus forquignonii
  • Polyporus forquignonii
  • Polyporus lentus
  • Polyporus tiliae
  • Polyporus tiliae
  • Rhodophyllus forquignonii