Common Grey Disco
Mollisia cinerea
The Common Grey Disco is a widespread saprobic ascomycete fungus belonging to the order Helotiales. It produces tiny, disc- to cup-shaped fruiting bodies that usually appear in dense clusters on the underside or bark of dead deciduous branches. The coloration of the apothecia is typically ash-grey to bluish-grey, often featuring a paler, whitish-pruinose margin.
Details
Identification
Fruiting bodies 1-3 mm wide, shallowly cup-shaped, grey inner surface, margin pale and finely fringed, outer surface darker grey-brown, grows on dead wood.
Diet
Feeds saprobically by decomposing cellulose and lignin in dead deciduous wood.
Overwintering
Overwinters as mycelium within the wood substrate.
Ecology
Ecological role
Important decomposer in forest ecosystems, contributing to humus formation and nutrient cycling.
Natural predators
Mycetophagous insect larvae, collembolans, and slugs.
Competitor species
Other wood-decaying fungi such as Orbilia species or Peniophora species.
Ecosystem service
Decomposition of dead wood and provision of nutrients for soil organisms.
Threats
Habitat loss due to excessive removal of dead wood in forestry management.
Scientific profile
Profile
Distinguishing features
Characterized by the grey color, the absence of a stem (sessile), and growth on decorticated deciduous wood. Microscopically, the hyaline, unicellular, narrowly elliptical to almost cylindrical spores (approx. 7-10 x 2-2.5 µm) and filiform paraphyses are decisive.
Habitat
Deciduous and mixed forests, parks, shrublands, and gardens with sufficient deadwood. Prefers shaded, moist locations.
Reproduction
Sexual reproduction via ascospores produced in eight-spored, cylindrical-clavate asci.
Protection & threats
Status not on standard scale
Main threats
Intensive forestry where deadwood is consistently removed; large-scale drainage of forest sites.
Conservation measures
Promotion of deadwood concepts in forestry; leaving fallen deciduous wood in forests and parks.