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Page number:743 
Remarks (internal):This robust and striking species appears occasionally in Utah in montane forests but is not common. In North America, I. spuria is known thus far from Utah and British Columbia even though the Canadian samples were identified from sequences obtained during soil sampling (GenBank Nos. FJ554451, FJ553958) (Jacobsson and Larsson 2009). As far as we know, no basidiomata have been reported from British Columbia.
The material from Utah compares very well with the description of Jacobsson and Larsson (2009) who were the first to point out the high sequence similarity between North American and European sequences. Until these workers showed I. spuria to be an independent taxon, it had been identified as I. squamata J.E. Lange (Matheny et al. 2009). The two species closely resemble one another and are not easily separated morphologically. However, I. spuria can be separated from I. squamata by its narrower spores that tend to be predominantly phaseoliform rather than mostly ellipsoid as in I. squamata (Jacobsson and Larsson 2009). Thus far, I. squamata has not been found in Utah, and further work will be required to determine whether it occurs anywhere in North America. It should be pointed out that before the discovery of I. spuria, a fungus was reported as I. squamata from Populus tremuloides stands in Montana by Cripps (1997). Molecular data for this material probably will answer the question of whether it belongs to I. squamata or I. spuria.
 
Description type:Non-original description 
Description:Inocybe spuria Jacobsson & Larsson, Mycotaxon 109:204. 2009. Figs. 12, 13h
Pileus 30-65 mm diam, conical becoming broadly conical, sometimes with umbo, margin incurved; surface radially appressed-fibrillose, smooth, somewhat shiny when dried, disk often but not always with small scales; color uniformly light tan (2.5Y 8/6-7/6) when young becoming reddish tan (7.5YR 6/8), dark yellow brown (10YR 4/4), or yellow brown (10YR 7/6) and tending to crack when mature. Lamellae close, notched, 3-7 mm deep, pale yellow brown (5Y 9/4) when young becoming dull yellow brown (2.5Y 7/4-5Y 8/6) at maturity with whitish margins. Stipe 40-80 x 10-18 mm, equal, solid, occasionally joined at the base, longitudinally striate; white when young, becoming light brown (7.5YR 7/6-6/6) at maturity with a pallid or pale yellow brown to yellow brown (10YR 7/6-8/6) apex, sometimes with a white base.. Context white. Odor spermatic.
Basidiospores 8.0(9.7)11.5 x 4.5(5.4)6.0 µm, smooth, ellipsoid to phaseoliform. Basidia 31-38 x 9-11 µm, four- or two-sterigmate, clavate. Pleurocystidia none. Cheilocystidia 23-55 x 13-25 µm, numerous, thin-walled, varying in size, broadly clavate to elliptical. Pileipellis a dense layer of repent, golden brown hyphae that are 3-5 µm wide and either smooth or sometimes lightly encrusted. Lamellar trama subparallel, hyaline hyphae that are 4-10 µm wide, with a more compacted subhymenium of hyphae that are 2-4 µm wide. Stipitipellis at the apex of parallel hyaline hyphae covered with loosely arranged light brownish hyphae, the remainder of the stipe is similar but having a more abundant covering of loose hyphae with golden brown pigmentation. Clamps present.
Habitat and distribution: In Utah appearing in summer in montane environments with mixed Populus tremuloides and onifers.
 
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