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 Add this item to the list   818416 Original description
   
Remarks (public):— Gyroporus pseudolacteus is morphologically characterized by its large size, the long stipe in relation to the pileus diameter (1.5–2 times longer), the whitish to cream white basidiomata staining deep and persistently indigo blue when handled or bruised, and by fruiting on sandy soil under Pinus pinaster. In our phylogeny (MycoBank supplementary data) Gyroporus pseudolacteus belongs to a well-supported clade together with G. lacteus and G. cyanescens. G. lacteus, a species sister to Gyroporus pseudolacteus, has been typified recently by Vizzini et al. (2015) selecting Léveillé’s plate 9 (1–2) (in Annls Sci. Nat., Bot., 1848) as a lectotype and a collection from Italy collected on sandy soil with Pinus pinea and Quercus ilex as an epitype. G. lacteus however differs from G. pseudolacteus because of the shorter stipe in relation with the pileus diameter (same length or shorter than pileus diameter) and the pileus which at maturity is ochraceous and covered by large and irregular scales. Several studies (Vizzini et al. 2015) suggest that Gyroporus cyanescens (Bull.) Quél. should be considered a complex which appears to represent multiple cryptic species. Vizzini et al. (2015) have typified G. cyanescens selecting Bulliard’s plate 369 (in Herbier de la France 8, 1788) as a lectotype and a collection from Italy under Pinus sylvestris as an epitype. G. cyanescens differs from G. pseudolacteus because of its smaller habit, the shorter stipe in relation with the pileus diameter (same length as pileus diameter) and the presence of a typical whitish annular zone at the stipe’s apex in contact with the pileus as pointed by Muñoz (2005). Both species, G. lacteus and G. cyanescens have been studied by us and sequences of them have been deposited in GenBank. Gyroporus ammophilus (Castro & Freire) Castro & Freire and G. castaneus (Bull.) Quél. belong to a clade sister to the clade including G. pseudolacteus. G. ammophilus, is a species linked to sandy calcareous pine groves, in littoral areas, characterized by its slightly pinkish to salmon coloured context staining light blue when handled or bruised (Castro & Freire 1995; Muñoz 2005). According to our phylogeny it must be considered an autonomous species. In our phylogeny Gyroporus castaneus appears to represent several cryptic taxa, all of them with white context not blueing when handled or bruised, a character which clearly separate them from G. pseudolacteus. 
Description type:Original description 
Description:Pileus fleshy, 7–15 cm broad, at first more or less hemispherical, then becoming convex to applanate convex, rarely depressed at centre, the surface velutinous, dry, whitish to cream white, at maturity with more or less strong ochraceous tinges, often covered with sand which is difficult to wipe off; 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, exceeding. Tubes short, 5–10 mm in length, free, sometimes emarginate towards the stipe, whitish, staining strongly dark blue or blue indigo when bruised or cut; pore surface when young concolorous with the tubes, at maturity cream to pale yellowish, very small, circular to angular at maturity, 1-2 per mm. Stipe 5–19 × 2–7 cm, cylindrical to clavate, widened at the base, brittle, stuffed with a soft pith, developing several cavities or becoming hollow at maturity, whitish to white cream, becoming more or less ochraceous at maturity, often covered with sand which is difficult to wipe off; context in stem whitish, staining strongly dark blue or blue indigo when bruised or cut, this colour being retained in drying and in some herbarium specimens. Odour and taste not distinctive. Spore-print: yellowish. Spores 8–12 × 4.5–6.5 µm, av. 9.1–10.3 × 4.9–5.5, (6 collections), Qav. = 1.75–1.87 cylindrical-ellipsoid to ellipsoid in face view, some of them slightly phaseoliform to reniform-phaseoliform in side view, with strong hilar appendage, without germ-pore, hyaline to yellowish; under the SEM spores lack any ornamentation. Basidia 4-spored, 35-45 × 10-15 µm, sterigmata up to 5.5 µm long, clavate, hyaline. Cheilocystidia fusiform, 35–50 × 9–17 µm. Pleurocystidia infrequent or absent, similar to cheilocystidia. Caulocystidia cylindrical, thinner at the apex, 50–80 × 8–12 µm. Pileipellis a cutis of radially arranged hyphae, with some terminal repent terminal elements, up to 20 µm wide. Pigment yellowish-ochre, both intracellular and parietal, sometimes minutely encrusting. Clamp-connections present in all tissues. Habitat and distribution – Growing gregarious on sandy acid soil under Pinus pinaster. Uncommon in the studied area. Oct.-Nov. So far known only from Spain. 
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