Water Cup Fungus
Adelphella babingtonii
The Water Cup Fungus is a small, aquatic ascomycete from the family Pezizaceae. It produces brown, cup- to bowl-shaped fruiting bodies that grow directly on submerged hardwood in clean flowing or standing waters. The species is quite rare and difficult to find due to its specific ecological niche and water quality requirements. It plays an important role in the decomposition of organic matter in aquatic systems.
Details
Identification
Small, cushion- to cup-shaped fruiting bodies (apothecia), light brown to dark olive-brown color, gelatinous consistency, grows on submerged wood.
Diet
Saprotrophic; feeds by decomposing lignin and cellulose from dead, submerged wood.
Overwintering
Resting stages in the substrate or mycelium within submerged wood.
Ecology
Ecological role
Important primary decomposer of woody debris in aquatic ecosystems; promotes nutrient cycling.
Natural predators
Aquatic insect larvae, snails.
Competitor species
Other aquatic fungi and bacterial biofilms on woody debris.
Ecosystem service
Decomposition of organic matter and provision of nutrients for the aquatic food web.
Threats
Water pollution, eutrophication, removal of woody debris from streams (river maintenance).
Scientific profile
Profile
Distinguishing features
Characterized by its semi-aquatic occurrence on wet wood, gelatinous consistency, and microscopically by large, ellipsoid, smooth spores (approx. 18-22 x 11-14 µm) containing two large oil drops, and amyloid asci. The genus Adelphella is distinguished from Pachyella by the absence of paraphyses with apical pigment crusts.
Habitat
Specialized habitats such as stream banks, alder carrs, wet ditches, and alluvial forests. The fungus often grows directly at the water line on branches lying in the water.
Reproduction
Sexual reproduction via ascospores. Spores are actively discharged from the asci into the boundary layer above the water.
Protection & threats
Status not on standard scale
Main threats
River engineering, removal of deadwood from streams (stream maintenance), drainage of carr forests, and general lowering of the groundwater table.
Conservation measures
Preservation and promotion of deadwood in water bodies, protection of alluvial and carr forests, restoration of straightened stream courses to re-establish natural flooding dynamics.