<e1>Hebeloma radicosoides</e1> sp. nov., an agaric belonging to the chemoecological group ammonia fungi

<e1>Hebeloma radicosoides</e1> sp. nov. is described, illustrated and characterised. It superficially resembles <e1>H. radicosum</e1> in having a long-rooting stipe with a well-formed, membranous annulus and in having preference for animal wastes as its resources. Its pileus is yellower than that of <e1>H. radicosum</e1>, and it fruits after addition of urea to soil, whereas <e1>H. radicosum</e1> does not. It also fruits on various animal wastes whereas <e1>H. radicosum</e1> specifically fruits on mole or mouse middens. Unlike <e1>H. radicosum</e1>, <e1>H. radicosoides</e1> has no distinct odour. <e1>Hebeloma radicosoides</e1> also resembles <e1>Hebeloma luchuense</e1> and <e1>H. spoliatum</e1> in having a long-rooting stipe and in fruiting on urea-treated soil, but differs from them by having a yellowish scaly pileus and distinct, membranous annulus.