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Family: PhysalacriaceaeGenus: Armillaria
Anamorph: not known.
Teleomorph: Basidiomata agaricoid, fruiting singly or in small clusters in wet ground, apparently not forming rhizomorphs. Cap 3-6 cm diam. (to 10 cm diam. in European collections), initially domed with a downwards curved margin, becoming flat and sometimes developing a central depression and wavy margin. Cap flesh relatively thin, particularly towards the striate margin where it may become translucent when wet, without a distinctive odour, hygrophanous (i.e. becoming significantly darker when wet and paler on drying); yellowish brown, possibly with rosy tints, and darker brown at the centre where the texture becomes slightly more scaly or at least fibrillose. Gills cream coloured or developing pinkish tints, sometimes slightly decurrent (arching downwards at the point of attachment). Stem 6-10 x 0.6-1.3 cm, cylindrical or laterally compressed, without a ring and only slightly thickened at the base, similar in colour to that of the cap, coated with minute scales or fibrils. Spore print white or creamy. Basidiospores 6.7-9.5 x 5.5-6.5 μm, subglobose to ellipsoidal, not amyloid.