Abstract
Scleroderma is a common and widespread gasteromycete genus which produces macroscopic sporocarps termed “earthballs” amongst leaf litter, grass or on bare soil in or adjacent to forested areas (Fig. 7.1). These brown, leathery, rounded structures become dry and crack at maturity, and the dry, powdery basidiospores are dispersed by the wind blowing through fissures in the upper surface of the basidiome. The ectomycorrhizal (ECM) status of many Scleroderma species is proven, but in some cases the relationship is inferred rather than established, and several also appear capable of a free-living saprotrophic existence. Scleroderma citrinum Pers. (syn. S. aurantium Viall.: Pers., S. vulgare Horn.), for example, occurs as a saprotroph on rotting wood but has also been demonstrated to form typical ECM. Richter and Bruhn (1989a) used data collected from enzyme tests to suggest the genus was wholly mycorrhizal rather than partly saprotrophic. The basidiomes are not edible and there are reports of mild toxic effects on mammals following ingestion. Basidiomes of Scleroderma have been reported as hosts for fungicolous fungi. For example, basidiomes of Xerocomus parasiticus (Fr.: Fr.) Gilb. are found occasionally growing out from basidiomes of S. citrinum, but this unique relationship has not been reported for other Scleroderma species. Moribund basidiomes of S. citrinum are frequently overgrown by Sepedonium chrysospermum (Bull.: Fr.) Link, a fungicolous species which also grows on other species as well as the related ECM genera Paxillus and Boletus (Jeffries and Young 1994).
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Jeffries, P. (1999). Scleroderma. In: Cairney, J.W.G., Chambers, S.M. (eds) Ectomycorrhizal Fungi Key Genera in Profile. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-06827-4_7
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