Summary:
Features include 1) resupinate growth on wood, 2) a cobwebby to cottony fruitbody that is dull green to yellowish green, the surface smooth to warted or toothed, often faintly punctate, the margin irregular and almost white, and the subiculum also paler than spore-bearing area, 3) spores that are round to nearly round, verrucose to aculeolate, pale citrine to yellow in water, and usually purple in 2-3% KOH, 4) subicular hyphae that are colorless to slightly citrine (often purple in KOH), with clamp connections, 5) presence of cordons.

Microscopic:
SPORES 5-6 microns in diameter, round to nearly round, verrucose to aculeolate, pale citrine to yellow in water, usually purple in KOH; BASIDIA 4-spored, 20-35 x 5-7 microns, clavate, with clamp connection at base, sterigmata up to 5 microns long; SUBHYMENIAL HYPHAE 2.5-3.5 microns wide, colorless, thin-walled, with clamp connections; SUBICULAR HYPHAE 2.5-4 microns wide, colorless to slightly citrine (often purple in KOH), thin-walled or with some thickening apparent, with clamp connections; CORDONS 5-30 microns wide, citrine to pale brown, individual hyphae 2-3 microns wide, thin-walled, with clamp connections, (Larsen), spores of Amaurodon species staining violet to dark blue in 2-3% KOH, (Ginns(23))

Notes:
Amaurodon viridis has been found in BC, ID, AZ, CA, MO, MN, NY, PA, and VT, (Ginns(5)), and Czechoslovakia, France, Netherlands, Russia, United Kingdom, Tunisia, Australia, and New Zealand, (Larsen).

Synonyms and Alternate Names:
Caldesiella viridis (Alb. & Schwein.) Pat.
Hydnum sudans Alb. & Schwein.
Hypochnus chlorinus Massee
Odontia sudans (Alb. & Schwein.) Bres.
Sistotrema viride Alb. & Schwein.
Tomentella chlorina (Massee) G. Cunn.
Tomentella viridis (Berk.) G. Cunn.