B. radicans

Boletus L.

Recent molecular studies have shown that Boletus in its current circumscription is likely an artificial grouping and it is possible that it will be split at some point into smaller genera. Note that Boletus impolitus and Boletus depilatus for practical reasons are retained here, although there is strong evidence that they are closely related to Xerocomus subtomentosus and its allies.

Fruitbody large to medium sized, boletoid, without veil and ring. Stipe solid, with surface usually covered with granules or network. Flesh variously coloured, changing or not when exposed to air. Tubes easily separable from each other, not tearing apart. Pores usually small and rounded.

Boletus radicans Pers. : Fr.

Description
Cap up to 20 cm, at first hemispherical, later convex to flat-convex, dry, smooth, sometimes cracked, ivory, greyish, ochraceous grey or ochraceous, blueing or not when bruised. Stipe cylindrical, club-shaped or swollen at the base, often rooting, lemon yellow to yellow, sometimes discolouring to yellowish white, with or without reddish or rusty band, at least in the upper part with white to yellow network. Flesh in young fruitbodies lemon yellow, later yellowish, sometimes pinkish in the stipe base, blueing when exposed to air. Tubes lemon yellow, later pale yellow with olivaceous tint, blueing when injured. Pores concolorous with the tubes, blueing when bruised. Smell not distinctive. Taste bitter. Spores 10–15 × 4–6 μm, ratio 2–3.1. Pileipellis trichodermium of interwoven septate hyphae of finely incrusted cylindrical cells. Chemical reactions: hyphae of the flesh in the stipe base inamyloid with Melzer’s solution.

Habitat. Broadleaf forests, mycorrhizal with oaks (Quercus), beech (Fagus), hornbeam (Carpinus) or lime (Tilia).

Distribution. Widespread throughout Europe, though rare in north.

Note. Boletus sanguineipes is very similar and is distinguished on the account of its reddish stipe (Panzera 1997). By my oppinion it is an occasionally found unusual form of Boletus radicans.

Photographs

Important literature

Alessio, C.L. 1985. Boletus Dill. ex L. (sensu lato). – In: Fungi Europaei. Vol. 2. Pp. 1–705. Libreria editrice Biella Giovanna, Saronno.

Breitenbach J. & Kränzlin F. 1991. Pilze der Schweiz. Bd. 3(1). Röhrlinge und Blätterpilze. Verlag Mykologia, Luzern.

Engel, H., Krieglsteiner, G., Dermek, A. & Watling, R. 1983. Dickröhrlinge. Die Gattung Boletus in Europa. Verlag Heinz Engel, Weidhausen b. Coburg.

Estadès, A. & Lannoy, G. 2004. Les bolets européens. – Bulletin Mycologique et Botanique Dauphiné-Savoie 44(3): 3–79.

Galli, R. 1998. I Boleti. Atlante pratico-monographico per la determinazione dei boleti. Edinatura, Milano.

Knudsen, H. & Vesterholt, J. [eds.]. 2008. Funga Nordica. Nordsvamp, Kopenhagen.

Lannoy, G. & Estadès, A. 2001. Les Bolets. Flore mycologique d’Europe. Documents Mycologiques Mémoire Hors série no. 6. Pp. 1–163. Association d’Écologie et de Mycologie, Lille.

Muñoz, J.A. 2005. Boletus s. l. – In: Fungi Europaei. Vol. 1. Pp. 1–951. Edizioni Candusso, Alassio.

Panzera, G. 1997. Boletus sanguineipes, species nova della sezione Calopodes. – Rivista di Micologia 40: 303–309.

Pilát, A. & Dermek, A. 1974. Hríbovité huby. Československé hríbovité a sliziakovité huby (Boletaceae – Gomphidiaceae). Veda, Bratislava.

Singer, R. 1967. Die Röhrlinge. II. Die Boletoideae und Strobilomycetaceae. – In: Die Pilze Mitteleuropas. Vol. 6. Pp. 1–151. Julius Klinkhardt Verlag, Bad Heilbrunn.

Šutara, J., Mikšík, M. & Janda, V. 2009. Hřibovité houby. Čeled’ Boletaceae a rody Gyrodon, Gyroporus, Boletinus a Suillus. Academia, Praha.

Watling, R. 1970. Boletaceae, Gomphidiaceae, Paxillaceae. – In: Henderson, D.M., Orton, P.D. & Watling, R. [eds]. British fungus flora. Agarics and Boleti. Vol. 1. Royal Botanic Garden, Edinburgh.

Watling, R. & Hills, A.E. 2005. Boletes and their allies (revised and enlarged edition). – In: Henderson, D.M., Orton, P.D. & Watling, R. [eds]. British Fungus Flora. Agarics and boleti. Vol. 1. Royal Botanic Garden, Edinburgh.