Exidia blackening (Exidia nigricans) photo and description

Exidia blackening (Exidia nigricans)

  • Department: Basidiomycota (Basidiomycetes)
  • Subdivision: Agaricomycotina (Agaricomycetes)
  • Class: Agaricomycetes (Agaricomycetes)
  • Subclass: Auriculariomycetidae
  • Order: Auriculariales (Auriculariales)
  • Family: Exidia (Exidiaceae)
  • Genus: Exidia (Exidia)
  • Species: Exidia nigricans (Exidia blackening)


Exidia plana

Exidia blackening -Exidia nigricans

Exidia nigricans (With.)


Fruit body : 1-3 cm in diameter, black or black-brown, at first rounded, then fruiting bodies merge into one lumpy medullary mass extending up to 20 cm, adherent to the substrate. The surface is shiny, smooth or wavy-wrinkled, covered with small dots. When dry, they become hard and turn into a black crust covering the substrate. They can swell again after rains.

Flesh : dark, transparent, gelatinous.

Spore powder : white.

Spores are elongated, 12-16 x 4-5.5 microns.

Taste : negligible.

Smell : neutral.

Exidia blackening -Exidia nigricans


The mushroom is inedible, but not poisonous.


It grows on fallen and dried branches of deciduous and broad-leaved trees, sometimes covering a large area.


It is widely distributed throughout the northern hemisphere, including throughout Russia.


It appears in spring in April-May and grows until late autumn under favorable conditions.

Exidia blackening -Exidia nigricans

Similar species

Exidia spruce (Exidia pithya) - grows on conifers, fruit bodies are smooth. Some mycologists believe that spruce exsidia and blackening exsidia are one species.

Exidia ferruginous (Exidia glandulosa) - grows only on broad-leaved species (oak, beech, hazel). Fruit bodies never merge into a common mass. The spores of the glandular exidia are slightly larger.