Abstract
The distribution and ecological conditions of the occurrence of <em>Polyporus rhizophilus</em> in Poland are discussed. The species was previously known from only one locality in Dwikozy near Sandomierz. Further localities were found on the roots of <em>Stipa capillata</em> in the Skorocice reserve near Busko Zdrój and at an anthropogenic site among <em>Dactylis glomerata, Poa annua</em> and <em>P. trivialis</em> grasses in an urban park in Końskie. The latter locality is noteworthy as it is situated outside the occurrence range of xerothermic grasslands in the Wyżyna Kielecko-Sandomierska upland. This locality is isolated ecologically from the two remaining Polish localities situated in the xerothermic grasslands.
Highlights
Fungi of the genus Polyporus Fr. are saprobes or, less frequently, parasites
Polyporus rhizophilus produces single fruit-bodies that consist of a pileus and a stem
Polyporus rhizophilus usually occurs in steppe and xerothermic grasslands that develop in the continental climate
Summary
Fungi of the genus Polyporus Fr. are saprobes or, less frequently, parasites. They inhabit plants with wooded shoots (mostly species of deciduous trees, less often coniferous trees), causing white rot of wood and, exceptionally, of grasses. A total of 59 widespread species, of which a large number are species typical of tropical areas, are known worldwide (Domański et al 1967; Domański 1984; Kirk et al 2008). The genus is represented in Poland by 11 species, the majority of which are widespread in the country (Wojewoda 2003). Four species: P. brumalis, P. ciliatus, P. squamosus and P. varius, are common, while other species are rare. Polyporus rhizophilus is one of the rarest species, with interesting ecology and geographical distribution (Łuszczyński, Łuszczyńska 2009)
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