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Page number:162 
Remarks (public):The species is undoubtedly related to A. semisupina. but is separated by a consistently resupinate basidiocarp and larger spores. 
Description type:Non-original description 
Description:Antrodiella romellii (Donk) Niemelä - Karstenia 22:11. 1982. - Poria romellii Donk. Persoonia 5:84. 1967.
Basidiocarps resupinate, annual. coriaceous, in small to confluent patches. up to 4 nun thick, dense and hard when dry and semitranslucent in section as if partly soaked in an almost hyaline, resinous substance; pore surface cream to light buff or pale straw-coloured when dry, pores angular. usually 6-8 per mm. but some larger ones may be evident during drying; context whitc, up to 1 mm thick: tube layer concolorous, up to 2 mm thick:.
Hyphal system di-trimitic: generative hyphae thin-walled. with clamps. 2-3 µm in diam: skeletal hyphae hyaline, thick-walled. nonseptate, 2-4 µm in diam, some slightly more branched: more frequently branched hyphae of even thickness are also present. 1.5-3 µm wide, they may be interpreted as binding hyphae.
Cystidia not present, hyphal pegs may occur.
Basidia clavate, 4-sterigmate, 9-15 x 3-5 µm. with a basal clamp.
Basidiospores oblong-ellipsoid to short cylindrical, hyaline, smooth. thin-walled,
negative in Melzer's reagent. 3.5-4 x 2-2.5 µm.
Type of rot. White sap rot, primarily on Salix sp. but also known from other hosts. Cultural characteristics. Unknown.
Sexuality. Unknown.
Substrata. On dead hardwoods, such as Betula, Carpinus, Castanea, Corylus, Fagus, Ilex. Quercus, Salix, Populus. In North America commonly on conifers. Distribution. Circumboreal and widespread in Europe except for the Iberian peninsula and Great Britain. North to Finnmark at 70° N in Norway.
 
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