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Page number:1123 
Remarks (internal):We have considered extra-North-American names that are apparently facultative synonyms of B. terrestris. We assume from our experience with the species and its varieties in western North America that the `strains' exhibiting different characteristics from the varieties presented here, will, in all probability, be additional distinct varieties with similar degrees of specialization. It is not surprising, even in light of this specialization, to find B. terrestris var. sartoryi in two widely separated geographical areas, as many other fungus species (mycorrhizal symbionts or nonsymbiotic wood inhabitants) have circumglobal distributions. What is noteworthy of var. sartoryi, though, is its apparent confinement to the Pacific Northwest in North America as are vars. lilacinorosea and aurantiaca. In contrast, however, var. sublutea ranges from the Pacific Northwest south to central Mexico, while var. parksii apparently occurs throughout the forested areas of North America.
A limited number of European collections representative of B. terrestris have been examined, including the nomenclatural types of P. mycorrhiza, P. mollicula, and P. sartoryi. The type of P. terrestris fa. corticiformis Bourd. & Galz. was not available for examination. Only P. sartoryi can be equated with forms that occur in North America. We would also emphasize that the type of Poria sartoryi does not contain mycorrhizal structures; therefore, comparisons of respective mycorrhizae could not be made.
Poria mycorrhiza and P. mollicula probably represent additional distinct varieties, as do some individual collections that we have examined from Sweden and Switzerland.
 
Description type:Non-original description 
Description:Byssoporia terrestris (DC. per Fries) Larsen et Zak, comb. nov. (basionym: Polyporus terrestris DC. per Fries, Syst. Mycol. 1: 383. 1821.)
? Poria terrestris (DC. per Fries) Sacc., Syll. Fung. 6: 332. 1888.
? Byssocorticium terrestre (DC. per Fries) Bond. et Sing., Ann. Mycol. 39: 48. 1941.
= Poria mollicula Bourd., Lloyd Lib. Mus. Mycol. Writ. 4: 543. 1916. (BPI).
= Poria parksii Murr., Mycologia, 13; 175. 1921. (NY, BPI).
= Poria sartoryi Bourd. et L. Maire, Assoc. Fr. Av. Sci. p. 619. 1921 (not seen but cited as such in Bull. Soc. Mycol. Fr. 41: 216. 1925.) (PC).
? Byssocorticium sartoryi (Bourd. et Maire) Bond. et Sing., Ann. Mycol. 39; 48. 1941.
? Poria terrestris subsp. sartoryi (Bourd. et Maire) Bourd. et Galz., Hym. Fr., p. 655. 1928.
= Poria mycorrhiza Killerm., Hedwigia, 67: 129. 1927 (S).
Basidiocarps annual, effused for several centimetres, up to 3 mm thick, separable from the substrate; pore surface at first white to cream, becoming dull cream with orange, rose, pink, blue-green, blue, purple, and yellow areas, finally dull brown in some instances; tubes up to 3 mm long, pores sub-angular, round, or daedaloid, 2-3/mm, dissepiments becoming thin to lacerate; margin concolorous with, to paler than, the pore surface; rhizomorphs visible to the naked eye, concolorous with, to paler than, the pore surface, up to 0.3 mm diameter; fluorescing various colors under 3660 A (1 A = 0.1 nm).
Hyphal system monomitic. Subicular hyphae 2-3(-4.5) µm diameter, sparsely to densely encrusted with granules, septate, clamp connections infrequent, sometimes inflated at the septa; rhizomorphs with core or central hyphae 2.5-11 µm diameter, with or without clamp connections; surface hyphae thin to thick walled, with or without encrustation, l.5-3 µm diameter, straight, curly, spirallike, or staghornlike in appearance; tramal hyphae similar and continuous with the context, 2-4.5 µm diameter, thin walled, septate, clamp connections absent; basidia transversely septate at the base, clamps absent, 15-25 x 5-6 µm, four sterigmate, clavate; basidiospores hyaline, smooth, 4-5 x 3-3.5 µm, broadly ellipsoid to subglobose, less frequently globose, with wall thickening apparent, obliquely apiculate, acyanophilous, negative in Melzer's reagent.
 
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