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Page number:196 
Remarks (public):Boletus terrestris was originally included in Byssocorticium but later segregated because of the poroid hymenophore, non-blue basidiome and the clampless basidial bases. Phylogenetically is classified in the Russulaceae close to the stipitate and pileate poroid genus Albatrellus (Bruns et al. 1998, Larsson 2007b). 
Description type:Non-original description 
Description:Byssoporia terrestris (DC.) M.J. Larsen & Zak, Can. J. Bot. 56: 1123 (1978)
Bas.: Boletus terrestris DC., in de Candolle & Lamarck, Fl. franç., Edn 3 (Paris) 5/6: 39, 1815.
Basidiome annual, soft, resupinate with yellow rhizomorphic margins, pore surface yellow to orange, brownish when old or touched, hymenophore poroid with angular to irregular pores, 2-3 per mm, subiculum cottony, very thin, pale yellow. Hyphal system monomitic, subhymenial hyphae with simple septa, thin-walled or with distinct walls, smooth or encrusted, 2.5-4.5 ?m wide, subicular hyphae with few scattered clamps. Cystidia and cystidiols absent. Basidia clavate, 15-25 x 5-6 ?m, guttulate, with 4-sterigmata, and with a simple septum at the base. Basidiospores ellipsoid to globose, 4-5 x 3-4(-4.5) ?m, smooth, thick-walled, hyaline, IKI-.
Distribution in Europe: Austria, Poland, Estonia, Germany, Croatia, Macedonia, United Kingdom, Slovenia, Portugal, Italy, Denmark, Sweden, Norway, Finland, and Spain. Present in many European countries, but with a sporadic distribution. Very rare species in Italy, recorded only from Emilia-Romagna and Toscana Regions.
Substrata: on the ground in a Castanea forest and on mosses.
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