Variable Cup
Peziza varia
The Variable Cup is a widespread ascomycete fungus in the family Pezizaceae. It produces cup- to bowl-shaped fruiting bodies with a brownish inner surface and a lighter, finely granular outer surface. The species is morphologically highly variable and is now often considered a species complex that includes several formerly distinct taxa such as Peziza repanda.
Details
Identification
Cup-shaped fruiting body, brittle flesh without latex, layered trama in microscopic section, spores without oil droplets.
Diet
Saprobic lifestyle; feeds by decomposing dead organic matter such as cellulose and lignin.
Spawning substrate
Decaying hardwood, wood chips, lime-rich soils, or burn sites.
Overwintering
Survival as mycelium within the substrate (wood or soil).
Ecology
Ecological role
Important primary and secondary decomposer in the forest ecosystem, contributing to humus formation.
Natural predators
Various slug species and mycophagous beetle larvae.
Competitor species
Other saprobic fungi of the genus Peziza or wood-decaying basidiomycetes.
Ecosystem service
Nutrient cycle regulation by decomposing organic waste and providing nutrients.
Threats
Large-scale removal of dead wood and soil compaction in forested areas.
Scientific profile
Profile
Distinguishing features
The most important feature is the moniliform paraphyses (bead-like segmented cells of the sterile filaments between the asci). The asci are 8-spored and amyloid at the tip (staining blue with iodine/Melzer's reagent). Spores are elliptical, smooth, hyaline, and lack oil droplets (14-16 x 8-10 µm).
Habitat
Deciduous forests, parks, gardens, storage sites for wood or bark mulch; often near human settlements (anthropogenically influenced sites).
Reproduction
Sexual reproduction via ascospores formed within sacs (asci).
Protection & threats
Status not on standard scale
Main threats
Currently not threatened; partially benefits from anthropogenic substrates like bark mulch.
Conservation measures
No specific conservation measures required; maintaining dead wood in forests supports the species.