Cap: 1-5 cm broad. Conic at first, expanding withage to convex and eventually plane with an obtuse umbo. Margin incurvedwhen young, soon straightening. Surface adorned with radial fibrils,more floccose towards the disc. Colour sordid buff to sordid ochraceousbrown, often with greenish tinges.
Gills: Attachment adnate tonearly free, crowded, pale grayish brown to clay brown with greenishtones or bruising greenish where injured.
Stem: 22-50 mm long by 3-7 mmthick. Equal to swelling at the base, solid, whitish to pallid atfirst, becoming bluish green from the base upwards. Surface pruinosenear the apex and longitudinally fibrillose below. Partial veilcortinate, soon disappearing. Flesh whitish, soon bruising bluishgreen, or naturally bluish green near the base. Odor disagreeable;soapy smelling.
Microscopic features: Sporesclay brown in deposit, smooth, ellipsoid, inequilateral, 7.5-10 by 4-5microns. Basidia 4-spored. Pleurocystidia 31-71 by 12-24 microns,narrow to broadly fusiform, subclavate, with clear to yellowish tingedwalls. Cheilocystidia scattered, and, when present, similar topleurocystidia.
Habit, habitat and distribution:Widely distributed across the temperate regions of the world. Reportedfrom central Europe and western North America. Found in sandy soils(including dunes), and underneath Populus (poplars) and Salix (willows) from June through October.
Image source: Inocybe aeruginascens wikipedia article
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