Humpbacked trametes

Humpbacked Trametes (Trametes gibbosa)


  • Department: Basidiomycota (Basidiomycetes)
  • Subdivision: Agaricomycotina (Agaricomycetes)
  • Class: Agaricomycetes (Agaricomycetes)
  • Subclass: Incertae sedis (undefined)
  • Order: Polyporales
  • Family: Polyporaceae (Polyporous)
  • Genus: Trametes (Trametes)
  • Species: Trametes gibbosa (Humpbacked Trametes)


  • Humpbacked polypore

  • Humpbacked polypore
  • Merulius gibbosus
  • Daedalea gibbosa
  • Daedalea virescens
  • Polyporus gibbosus
  • Lenzites gibbosa
  • Pseudotrametes gibbosa

Humpbacked Trametes (Trametes gibbosa)


Fruiting bodies are annual, in the form of sessile semicircular caps or rosettes 5-20 cm in diameter, located singly or in small groups. The thickness of the caps varies on average from 1 to 6 cm. The caps are more or less flat, with a hump at the base. The surface is white, often with individual darker concentric stripes of brownish, ocher or olive shades (optionally white with a pinkish-brown edge), slightly pubescent. The edge of the cap is rounded in young specimens. With age, pubescence is lost, the cap becomes smooth, creamy-ocher and overgrown (mostly in the central part, although it can be almost over the entire surface) with epiphytic algae. The edge of the cap becomes sharper.

The tissue is dense, leathery or corky, whitish, sometimes yellowish or grayish, up to 3 cm thick at the base of the cap. The smell and taste are inexpressive.

The hymenophore is tubular. The tubules are white, sometimes light gray or yellowish, 3-15 mm deep, ending in white or cream-colored radially elongated angular slit-like pores 1.5-5 mm long, 1-2 pores per millimeter (in length). With age, the pore color becomes more ocher, the walls are partially destroyed, and the hymenophore turns into an almost labyrinthine one.

Humpbacked Trametes (Trametes gibbosa)

Spores are smooth, hyaline, non-amyloid, more or less cylindrical, 2-2.8 x 4-6 microns in size. The spore print is white.

The hyphal system is trimic. Generative hyphae with non-thickened walls, septate, with buckles, branching, 2-9 microns in diameter. Skeletal hyphae with thickened walls, aseptic, unbranched, 3-9 microns in diameter. Connecting hyphae with thickened walls, branching and sinuous, 2-4 microns in diameter. Cystyds are missing. Basidia are clavate, four-spore, 14-22 x 3-7 microns.

Season and distribution

The humpback tinder fungus grows on deciduous species (dead wood, dead wood, stumps – but also on living trees). Prefers beech and hornbeam, but also occurs on birch, alder and poplar. Causes white rot. Fruit bodies appear in the summer and grow until the end of autumn. They keep pretty well during the winter and can be seen next spring.

A fairly common form of the northern temperate zone, although it noticeably gravitates towards the southern regions.

Similar types and differences from them

The humpback tinder fungus differs from other representatives of the genus Trametes by radially diverging slit-like, as if dotted, pores. A certain exception is the graceful trametes (Тrametes elegans), which has pores of a similar shape, but in it they diverge fountain-like from several centers. In addition, the graceful trametess has smaller and thinner fruit bodies. In Lenzites birch, the hymenophore is brownish or grayish-brownish, lamellar, the plates are thick, branching, with bridges, which can give the hymenophore the appearance of an elongated labyrinth.


The mushroom is not eaten because of its tough tissue.

Other information

In a tinder fungus with a hunchback, substances were found that have antiviral, anti-inflammatory and antitumor effects.

Photo: Alexander,.

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Hunting, Fishing and Mushrooms: a magazine for hunters and fishers.
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