Hebeloma radicosoides sp nov., an agaric belonging to the chemoecological group ammonia fungi

Hebeloma radicosoides sp. nov. is described, illustrated and characterised. It superficially resembles H. radicosum in having a long-rooting stipe wit h a well-formed, membranous annulus and in having preference for animal was tes as its resources. Its pileus is yellower than that of H, radicosum, and it fruits after addition of urea to soil, whereas H. radicosum does not. I t also fruits on various animal wastes whereas H. radicosum specifically fr uits on mole or mouse middens. Unlike H. radicosum, H, radicosoides has no distinct odour. Hebeloma radicosoides also resembles Hebeloma luchuense and H. spoliatum in having a long-rooting stipe and in fruiting on urea-treate d soil, but differs from them by having a yellowish scary pileus and distin ct, membranous annulus.