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Page number:36 
Description type:Non-original description 
Description:Amaurodon viridis (Alb. & Schwein.: Fr.) J. Schröt. in Cohn
Lectotype: Pennsylvania, Bethlehem, on angiospermous wood, L. D. Schweinitz (PH).
Basidiocarps resupinate, separable from the substratum, mostly arachnoid or pelliculose, continuous. Hymenophore bluish when fresh, yellow-green when dry, near Citrine, Herbage Green or Dark Herbage Green (near 5.OGY 6/4, 2.5GY 6/6 or 10.0 Y 6/6) when dry, hydnoid with some parts smooth, concolorous with subiculum. Sterile margin indeterminate.
Hyphal cords present only in subiculum, monomitic, up to 25 µm diam, yellowish in 3% KOH, individual hyphae clamped, 2-3 µm diam, hyaline in 3% KOH, thin-walled. Subicular hyphae clamped, 2-4 µm diam, thin-walled, without encrustation, hyaline or violet in 3% KOH. Hymenophoral trama present, teeth with sterile apex, tramal hyphae cystidia like, clamped, 3.5-7 µm diam, thin-walled, hyaline in 3% KOH. Subhymenial hyphae clamped, 2-4 µm diam, thin-walled, hyaline or violet in 3% KOH. Cystidia absent.
Basidia 25-38 µm long, 6-8 µm diam at apex, clamped at base, utriform, not stalked, often sinuous, without transverse septa, hyaline or violet in 3% KOH, hyaline in distilled water, 4 sterigmata.
Basidiospores 4.5-6 µm long in lateral and frontal face, slightly globose or ellipsoid frontal and slightly globose lateral face, verruculose, mostly violet in 3% KOH but this colour can fade under the cover glass, hyaline or yellowish in distilled water.
Remarks: A. viridis is a rare species but probably the most common of the genus and is widely distributed in the Northern and Southern Hemispheres. The ornamentation of the hymenophore is very variable from almost smooth to strongly hydnoid.
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