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Page number:290 
Remarks (public):Normally this is an easy species to recognize because of the yellowish to rusty color and the lamellate hymenophore. G. abietinum has much coarser and more distinct wavy lamellae and normally a more irregular hymenophore with scattered lamellae grading into poroid parts, or with some zones lamellate while others are poroid. Furthermore, basidiocarps of the latter species are softer and smoother on the surface, evenly brown when young, paling with age. G. sepiarium is a major factor in the decay of dead coniferous wood and formation of brown rot residues. 
Description type:Non-original description 
Description:Gloeophyllum sepiarium (Wulf.:Fr.) Karst. - Finl. Hattsv. 2:80, 1879. - Daedalea sepiaria Fr., Syst. Mycol. 1:333, 1821. - Agaricus sepiarius Wulf. Pl. rar. Carinth. in Jacq. Coll. 1:347. 1786.
Basidiocarps annual to perennial, pileate, broadly sessile. dimidiate or rosette shaped, often imbricate in clusters from a common base, or fused laterally to compound basidiocarps, up to 7 cm wide. 12 cm long and 6-8 mm thick at the base of the pileus, tough and flexible, margin sharp and slightly wavy; upper surface at first bright yellowish brown, then darker reddish brown and finally grayish to black, when young and along the margin finely tomentose, in age the hyphae agglutinate and the surface becomes tufted, hirsute to hispid or scrupose with coarse protuberances, finally more or less smooth in zones mixed with narrow, more persistent hispid bands, narrowly to broadly zonate reflecting different stages of growth and thus, the zones from the margin to base in old specimens are often differently colored; hymenophore lamellate with anastomosing, dense lamellae, 15-20 per cm behind the margin, more rarely mixed with poroid areas with rounded to irregular. sinuous, radially elongated pores, about 1-2 per mm. edges of lamellae light golden brown in active growth, later umber brown, side surface of lamellae ochraceous to pale brown, usually distinctly lighter than the context and trama, lamellae up to 7 mm deep; context dark brown, denser next to the lamellae than towards the upper surface, up to 5 mm thick. black in KOH.
Hyphal system trimitic; generative hyphae thin to thick walled, hyaline. with clamps. 2.5-4 µm in diam; skeletal hyphae dominating in the basidiocarp, especially in the upper context and trama, golden brown, straight, thick-walled, nonseptate, up to 6 µm in diam; binding hyphae few, tortuous and with relatively short branches, seen only in older parts of the context. pale golden brown, up to 4.5 µm in diam at the base.
Cystidia abundant in the hymenium. subulate to obtuse, thin to thick-walled in age. some extremely elongated, not or only slightly projecting, 25-95 x 3-7 µm, usually smooth, more rarely with a small crown of crystals.
Basidia narrowly clavate, 18-40 x 4.5-7 µm, some elongated to 110 µm, 4-sterigmate, with a basal clamp.
Basidiospores cylindrical, hyaline, smooth. negative in Melzer's reagent. 8-11(-12) x 3-5 µm.
Type of rot. Causes a brown rot of dead conifers, rarely hardwoods.
Cultural characteristics. See Nobles 1948. 1965; David 1968; Stalpers 1978. Sexuality. Heterothallic and bipolar (Nobles 1965).
Substrata. Most common on dead conifers, especially Picea but also known from Abies, Cupressus, Juniperus, Larix, Picea, Pinus, in North America also on Pseudotsuga, Taxodium and Tsuga, in Europe more rarely on angiosperms, but found on Alnus, Betula, Fagus, Populus, Prunus, Quercus, Salix and Scrims. It often occurs on exposed places like the top of stumps and partly fallen logs, etc. It is a highly heat-tolerant species and thus a serious decaying agent in wooden roofs and window sills.
Distribution. Widespread in the whole of Europe and known north to Porsanger, Norway at 70°N and seemingly present wherever there are coniferous or mixed forests. Circumboreal through Russia to North America and common everywhere.
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