Amaurodon aquicoeruleus (Thelephoraceae, Hymenomycetes, Basidiomycota), a new species from Australia with spores distinctly blue in water

Amaurodon aquicoeruleus sp. nov. from Australia is characterised by rough, subglobose, bright blue spores and blue subiculum hyphae when mounted in wa ter or KOH. No other species of Amaurodon with blue spores in water have be en reported. Amaurodon aquicoeruleus has a green hymenium and superficially resembles A. viridis. Amaurodon aquicoeruleus possesses thin rhizomorphs t hat are formed by runner hyphae with clamp connections and by other, simple septate hyphae. This contrasts with the consistently clamp-bearing basidia and hyphae of the trama and subiculum. Rhizomorph formation is similar to the boletoid rhizomorph type but atypical of the closely related genus Tome ntella. Discrete masses of structurally undamaged, mature basidiospores on the hymenium and at the fruit body margin of A. aquicoeruleus may be deposi ted by grazing insects.