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 Add this item to the list   826718 Original description
Remarks (public):Fomitopsis schrenkii is characterized by variable basidiocarp form, dimitic hyphal system with clamped generative hyphae, and ellipsoid basidiospores. It occurs on gymnosperms in the southwestern U.S.A. and as far north as Utah, Colorado, and southwestern South Dakota and is sympatric with F. mounceae in Utah. It is most similar to F. mounceae with respect to macro- and micromorphology; see discussion under F. mounceae above. Fomitopsis schrenkii is associated with conifers whereas F. mounceae occurs on hardwoods as well as conifers. Slight differences in basidiospore shape and size between the two taxa and ITS sequence were observed (TABLE 2, FIG. S–3). Floudas et al. (2012) based the whole genome sequence on monosporous isolate FP–58527 ss1 which is correctly named F. schrenkii and not F. pinicola. The ITS sequence, basidiocarp features, basidiospore size, host, and distribution of FP–58527 are all consistent with F. schrenkii. In addition, the monosporous culture of FP–58527 produced clamp connections when paired with F. schrenkii JEH–141 ss1 and ss2 and JEH–142 ss4 and ss6, indicating conspecificity. The holotype of P. ponderosus is in poor condition and is sterile. The overall morphology of the specimen appears to be that of a young basidiocarp of F. schrenkii. 
Description type:Original description 
Description:Similar to F. mounceae except with slightly broader basidiospores, 5.1–7(–7.5) × 3.3–4.3(–4.7) µm, Q = 1.5–1.6(–1.7), occurring on coniferous hosts exclusively, and distributed in southwestern United States, Colorado, Utah and South Dakota. 
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