Rubinoboletus Pilát & Dermek
The only European member of this genus is easily recognized due to the combination of carmine or pinkish red tubes and pores and broadly ellipsoid spores.
Rubinoboletus rubinus (W.G. Sm.) Pilát & Dermek
Description
Cap up to 8 cm, at first hemispherical then expanding to convex or almost flat, brick-coloured, reddish brown to yellowish brown. Stipe cylindrical or ventricose, usually tapering towards the base, pinkish, covered with very fine pink to carmine granules. Flesh yellowish, more or less pinkish under the cuticle, vivid yellow in the stipe base, unchanging when exposed to air. Tubes carmine or pinkish red, unchanging when exposed to air. Pores carmine or pinkish red, unchanging when bruised. Smell not distinctive. Taste not distinctive. Spores 5.5–8.5 × 4–5.5 μm.
Habitat. Deciduous forests, mycorrhizal mostly with oaks (Quercus), but also published recently with hornbeam (Carpinus) in Hungary (L. Kaposvári, in litt.).
Distribution. Widespread in Europe and reaching Armenia on the east, but fairly rare throughout.
Similarity. Rubinoboletus rubinus is similar and might be confused with Chalciporus amarellus. The later however has different cap colour, ellipsoid spores and grows under conifers.
Photographs
Fruitbodies of Rubinoboletus rubinus. (photo G. Kibby)
Fruitbody of Rubinoboletus rubinus in situ. Note the cap colour which may slightly resemble that of Chalciporus amarellus. (photo L. Kaposvári)
Fruitbody of Rubinoboletus rubinus. Note the stout appearance (photo L. Kaposváry)
Fruitbody of Rubinoboletus rubinus with unusual slender appearance. (photo O. Marsico)
Detail of the cap cuticle of Rubinoboletus rubinus. (photo O. Marsico)
Detail of the upper part of the stipe and the hyenophore of Rubinoboletus rubinus. (photo O. Marsico)
Detail of the pores of Rubinoboletus rubinus. (photo O. Marsico)
The painting accompanying the original description of Boletus rubinus as appered in Smith (1868). Figures numbers replaced with contemporary font for reading convenience.
Cystidium of Rubinoboletus rubinus. (photo O. Marsico)
Basidiospores of Rubinoboletus rubinus with broadly ovoid shape. (photo O. Marsico)
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.
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.
Halama, M. & Szypula, J. 2010. The first locality of Chalciporus rubinus (Boletales, Basidiomycota) in Poland. – Acta Mycologica 45: 57–65. (available online)
Klofac, W. 2006. Die Gattung Chalciporus, ein weltweiter Überblick. – Österreichische Zeitschrift für Pilzkunde 15: 31–65. (available online, 12.9 MB PDF)
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.
Pilát A. & Dermek A. 1969. Rubinoboletus, genus novum Boletacearum. – Česká Mykologie 23: 81–82.
Pilát, A. & Dermek, A. 1974. Hríbovité huby. Československé hríbovité a sliziakovité huby (Boletaceae – Gomphidiaceae). Veda, Bratislava.
Smith, W.G. 1868. New or rare hymenomycetous fungi of the British flora. – Journal of Botany, British and foreign 6: 33–36+Tab. 75. (available online)
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.