Thin-spored Cudoniella
Cudoniella tenuispora
The thin-spored Cudoniella is a small sac fungus from the Helotiaceae family, primarily found in very moist habitats. It produces tiny, whitish to pale yellowish fruiting bodies characterized by a top-shaped or disc-like form on a short stalk. The species prefers to colonize decaying wood, fallen branches, or leaves located in the splash zone of streams or in bogs. Due to its small size and specific habitat requirements, it is frequently overlooked.
Details
Identification
Tiny, stalked fruiting bodies (1-5 mm); cap surface flat or slightly convex, whitish to creamy yellow; microscopically characterized by narrow, elongated spores.
Diet
Saprobic lifestyle; the fungus feeds by decomposing complex organic compounds such as cellulose in moist wood.
Overwintering
Persistence as mycelium within the substrate (dead wood or organic material).
Ecology
Ecological role
Important primary decomposer in aquatic transition zones; contributes to the nutrient cycle by making organic material available to microorganisms.
Natural predators
Micro-organisms of the soil and wood fauna such as mites and springtails.
Competitor species
Other saprobic fungi of the order Helotiales and aquatic bacteria.
Ecosystem service
Matter transformation and humus formation in wetlands.
Threats
Loss of wetland habitats, drainage measures in forests, and removal of dead wood from riparian zones.
Scientific profile
Profile
Distinguishing features
Characterized by extremely narrow and long ascospores (approx. 15–22 x 1.5–2.5 µm), which gave the species its name. Compared to the more common Cudoniella clavus, the spores are significantly narrower. The fruiting body shape often resembles a molar tooth.
Habitat
Moist deciduous forests, alder carrs, stream banks, and swampy sites with abundant deadwood.
Reproduction
Sexual reproduction via ascospores formed in eight-spored asci. Spore release often occurs in visible clouds upon maturity.
Protection & threats
Status not on standard scale
Main threats
Drainage of wetlands, forestry removal of deadwood from streams, stream channelization.
Conservation measures
Preservation of alder carrs, leaving deadwood in watercourses, protection of spring areas and natural stream beds.