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 Add this item to the list   819875 Original description
Remarks (public):Gyroporus pseudocyanescens is morphologically characterized by its medium size, the stipe length more or less similar to pileus diameter, the yellowish basidiomata staining deep indigo blue when handled or bruised, and by fruiting on acid soil under different deciduous Quercus species. In our phylogeny (MycoBank supplementary data) Gyroporus pseudocyanescens belongs to a clade together with G. cyanescens, G. lacteus, G. pseudolacteus, G. ammophilus and G. castaneus. The closest species to G. pseudocyanescens is Gyroporus cyanescens, which should be considered a complex of cryptic species (Vizzini et al. 2015). These authors typified G. cyanescens by selecting Bulliard’s palte 369 (Bulliard 1788) as a lectotype (iconotype) and a collection from Italy under Pinus sylvestris as an epitype. Sequences of G. cyanescens have been deposited at GenBank. G. pseudocyanescens and G. cyanescens seem to be sibling species which are difficult to separate only based on morphology. Gyroporus lacteus differs from G. pseudocyanescens by its whitish pileus covered by large and irregular scales, and by fruiting in Mediterranean woods with Pinus pinea and Quercus ilex. Gyroporus pseudolacteus differs from G. pseudocyanescens by its larger size, longer stipe in relation to the pileus diameter (up to 1.5–2 times longer) and by fruiting under Pinus pinaster. Gyroporus ammophilus, a species linked to Pinus species growing in littoral areas on sandy calcareous soils (Castro & Freire 1995), differs from G. pseudocyanescens by its slightly pinkish to salmon coloured context staining light blue when handled or bruised (Muñoz, 2005). According to our molecular studies it must be considered an autonomous species. Gyroporus castaneus differs from G. pseudocyanescens by its chestnut-brown pileus and white context not blueing when handled or bruised. Gyroporus sulfureus, known only from the type material (Kalamees 1989), is considered to be a synonym of G. cyanescens (Muñoz, 2005). We have attempted to sequence several times this species (holotype) but have not succeeded, so no conclusion on the former can be drawn. 
Description type:Original description 
Description:Pileus 4–10 cm broad, at first more or less hemispherical, then becoming convex to applanate convex, sometimes depressed at centre, the surface velutinous, dry, strawish cream to yellow cream, often cracking at maturity becoming more or less brownish to brown yellowish; context in pileus whitish, staining strongly dark blue or blue indigo when bruised or cut, this colour being retained in drying and in some herbarium specimens; margin straight and regular, somewhat exceeding. Tubes short, 5–10 mm in length, free, sometimes emarginated towards the stipe, whitish; pore surface concolorous with the tubes when young, at maturity yellowish, very small, circular to angular at maturity, 1–2 per mm. Stipe 5–9 × 1.5–2.5 cm, cylindrical to clavate, brittle, developing cavities or becoming hollow at maturity, concolorous with the pileus, with a pseudoannular zone in the upper part where it is paler and smooth, becoming more or less yellowish brown at maturity; context in stem whitish, staining dark blue or blue indigo when bruised or cut, less obvious than in the pileus. Odour and taste not distinctive. Spore-print yellowish. Spores 8–11 × 4.5–6(–6.5) µm, on average 9.5 × 5.3 µm, Qav. = 1.75–1.85, cylindrical-ellipsoid to ellipsoid in face view, some of them suballantoid in side view, with strong hilar appendage, without germ-pore, hyaline to yellowish; under the SEM, spores lack any ornamentation. Basidia 4-spored, 35–43 × 10–14 µm, sterigmata up to 5.5 µm long, clavate, hyaline. Cheilocystidia difficult to observe in dried material, 35–55 × 7–10 µm fusiform, with encrustations at the apex. Pleurocystidia infrequent, similar to cheilocystidia. Caulocystidia, 50–80 × 8–12 µm, cylindrical with tapering apex. Pileipellis a cutis consisting of cylindrical septate hyphae, with obtuse apex, 50–80 × 9–15 µm, slightly yellowish and slightly encrusted. Clamp-connections present in all tissues. 
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