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Xerocomus illudens
Scientific classification
Domain:	Eukaryota
Kingdom:	Fungi
Division:	Basidiomycota
Class:	Agaricomycetes
Order:	Boletales
Family:	Boletaceae
Genus:	Xerocomus
Species:	X. illudens
Binomial name
	Xerocomus illudens; (Peck) Singer
Synonyms
	Boletus illudens Peck (1898)

Xerocomus illudens is a species of bolete fungus in the family Boletaceae. Described as new to science in 1898, it is found in Asia and North America, where it grows in a mycorrhizal association with oak.

Taxonomy

The species was first described scientifically by Charles Horton Peck in 1898.^[2] Rolf Singer transferred it to the genus Xerocomus in 1946.^[3] Although some mycologists prefer to maintain Xerocomus as a separate genus,^[4] taxonomic authorities usually lump Xerocomus into Boletus.^[1]^[5] However, recent studies have supported the splintering of Boletus into several genera and recognition of a core Xerocomus group using multi-loci analysis.^[6]

Description

The cap is initially convex before flattening out in maturity, and attains a diameter of 3–9 cm (1.2–3.5 in). The cap surface is dry, with a velvety to slightly hairy texture. The color in young specimens is pale brownish-yellow, changing gradually to yellow-brown or pinkish in maturity. The flesh is pale yellow, has no distinctive taste or odor, and, unlike many bolete species, does not turn blue when cut or injured. The pore surface on the underside of the cap is lemon yellow, and pores number about 1–2 per millimeter (sometimes more in older individuals). The tubes comprising the hymenophore are 0.8–1.6 cm (0.3–0.6 in) deep. The stem is 3–9 cm (1.2–3.5 in) long by 0.5–1.3 cm (0.2–0.5 in) thick, tapering somewhat near the base. It is solid (i.e., not hollow), dry, yellow, and marked by longitudinal grooves that form a partial reticulum (network-like surface).^[7]

Xerocomus illudens produces an olive to olive-brown spore print. The spores are elliptical to spindle-shaped, smooth, and measure 10–14 by 4–5 μm.^[7] Fruit bodies are edible.^[8] They can be used in mushroom dyeing, and produce colors such as beige (with yellow, green, or gray tints), or light gold, depending on the mordant used.^[9]

Habitat and distribution

Xerocomus illudens is a mycorrhizal fungus, and forms mutually beneficial associations with oak.^[10] Its fruit bodies grow singly, scattered, or in groups on the ground, in forests of oak or oak-pine. Fruiting occurs from July to October. In North America, its distribution extends from eastern Canada south to South Carolina, and west to Alabama and Minnesota.^[7] It has also been recorded in India, from Ramna Forest in the Burdwan District of West Bengal,^[11] and in the Himalayas.^[12]

References

^ ^a ^b "Boletus illudens Peck 1898". MycoBank. International Mycological Association. Retrieved 2012-10-10.
^ Peck CH. (1897). "Report of the State Botanist (1896)". Annual Report on the New York State Museum of Natural History. 50: 108.
^ Singer R. (1945). "The Boletineae of Florida with notes on extralimital species. II. The Boletaceae (Gyroporoideae)". Farlowia. 2: 293.
^ Binder M, Hibbett DS (2006). "Molecular systematics and biological diversification of Boletales". Mycologia. 98 (6): 971–81. doi:10.3852/mycologia.98.6.971. PMID 17486973.
^ Kirk PM, Cannon PF, Minter DW, Stalpers JA (2008). Dictionary of the Fungi (10th ed.). Wallingford, UK: CAB International. p. 737. ISBN 978-0851998268.
^ Nuhn ME, Binder M, Taylor AFS, Halling RE, Hibbett DS (2013). "Phylogenetic overview of the Boletineae". Fungal Biology. 117 (7–8): 479–511. doi:10.1016/j.funbio.2013.04.008. PMID 23931115.
^ ^a ^b ^c Bessette AE, Roody WC, Bessette AR (2000). North American Boletes. Syracuse, New York: Syracuse University Press. pp. 121–2. ISBN 978-0-8156-0588-1.
^ Phillips, Roger (2010). Mushrooms and Other Fungi of North America. Buffalo, NY: Firefly Books. p. 258. ISBN 978-1-55407-651-2.
^ Bessette A, Bessette AR (2001). The Rainbow Beneath my Feet: a Mushroom Dyer's Field Guide. Syracuse, New York: Syracuse University Press. p. 39. ISBN 0-8156-0680-X.
^ Kuo M. (January 2007). "Boletus illudens". MushroomExpert.com. Retrieved 2012-10-10.
^ De AB. (2006). "Two new additions to Indian Boletaceae". Journal of Natural History (India). 2 (1): 11–6. ISSN 0973-6166.
^ Sagar A, Lakhanpal TN (1991). "Fleshy fungi Of N.W. Himalayas XIV. Species of Boletus new to India". Indian Journal of Mycology and Plant Pathology. 21 (3): 262–3. ISSN 0303-4097.