Caloboletus radicans

Caloboletus radicans, also known as the rooting bolete or whitish bolete, is a large ectomycorrhizal fungus found in Europe under broad-leaved trees, fruiting during the summer and autumn months. It has a pale buff or greyish-white cap, yellow pores and a stout stipe, and stains intensely blue when handled or cut. Bitter and inedible, it can cause severe vomiting and diarrhoea if eaten. Until 2014 it was placed in genus Boletus, but has since been transferred to the new genus Caloboletus based on molecular phylogenetic data.

Caloboletus radicans
Scientific classification
Kingdom:
Fungi
Division:
Basidiomycota
Class:
Agaricomycetes
Order:
Boletales
Family:
Boletaceae
Genus:
Caloboletus
Species:
C.radicans
Binomial name
Caloboletus radicans
(Pers.) Vizzini (2014)
Synonyms[1]
  • Boletus radicans Pers. (1800)
  • Versipellis radicans (Pers.) Quél. (1886)
  • Suillus radicans (Pers.) Kuntze (1898)
  • Boletus albidus Roques (1841)
Caloboletus radicans
float
Mycological characteristics
pores on hymenium
cap is convex
hymenium is adnexed
stipe is bare
spore print is olive-brown
ecology is mycorrhizal
edibility: poisonous

Taxonomy

The fungus was first described by the pioneering South African-born mycologist Christian Hendrik Persoon in 1801, who placed it in genus Boletus. Its specific epithet is derived from the Latin radic- 'root', referring to its rooting stipe. The name Boletus albidus is a later synonym.[2] In 2014, the bolete was transferred to the new genus Caloboletus by Italian mycologist Alfredo Vizzini, based on phylogenetic data.[3]

It is often known by the common name of whitish bolete.[4]

Description

The cap diameter ranges from 7.5 to 30 cm (3.0 to 11.8 in) across, and is usually dirty white, greyish-white, ivory white or buff, downy at first, but often finely cracking at the centre as the cap expands. The stipe is 5–8 cm (2–3¼ in) tall by 3–4 cm (1¼–1⅔ in) wide, usually swollen or barrel-shaped when young, but soon becoming elongated and more or less fusiform, with a tapering base usually rooting into the substrate. The apex is typically bright lemon yellow, but fading below. There is a light straw-coloured reticulation at the upper part of the stipe, though in rare occasions this may be indistinct. The flesh is pale yellow, somewhat paler whitish to straw-coloured in the cap, instantly turning dark blue when cut. The pores are lemon yellow, small and rounded, bruising blue when touched or injured. The spore print is olivaceous walnut-brown.[2][5][6][7]

Microscopically, it has ellipsoid to fusiform spores measuring 11.5–14 × 4–5.5 μm. The hyphal structure of the cap is a trichodermium of interwoven septate hyphae, often finely incrusted.[8][9][6][10]

Distribution and habitat

Fruiting during warm spells in the summer and early autumn, Caloboletus radicans is ecologically versatile. It forms ectomycorrhizal associations with a wide range of broad-leaved trees, including oaks (Quercus), beech (Fagus), hornbeam (Carpinus), chestnut (Castanea) and lime (Tilia).[9][11] It grows on both calcareous (chalk) and acidic soils in southern England (where it is common) and across much of Europe.[2][6]

Edibility

The mushroom is inedible due to its intense bitterness.[2] A 2012 study on mushroom poisoning in Switzerland by Katharina M. Schenk-Jaeger and colleagues, found Caloboletus radicans to have caused severe gastrointestinal symptoms to those who had consumed it, including recurrent vomiting and bloody diarrhoea.[12]

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References
  1. "GSD Species Synonymy: Caloboletus radicans (Pers.) Vizzini". Species Fungorum. CAB International. Retrieved 2015-06-23.
  2. Phillips R (2006). Mushrooms. London: Pan MacMillan. p. 278. ISBN 0-330-44237-6.
  3. Vizzini A. (10 June 2014). "Nomenclatural novelties" (PDF). Index Fungorum (146): 1–2. ISSN 2049-2375.
  4. Lamaison, Jean-Louis; Polese, Jean-Marie (2005). The Great Encyclopedia of Mushrooms. Könemann. p. 33. ISBN 3-8331-1239-5.
  5. Courtecuisse R, Duhem B (1995). Mushrooms & Toadstools of Britain & Europe. London, UK: Harper-Collins.
  6. Muñoz JA. (2005). Fungi Europaei 2: Boletus s.l. Italy: Edizioni Candusso. ISBN 978-88-901057-6-0.
  7. Bon M. (1987).The Mushrooms and Toadstools of Britain and North Western Europe.
  8. Breitenbach J, Kränzlin F (1991). Pilze der Schweiz 3(1). Röhrlinge und Blätterpilze (in German). Luzern, Switzerland: Verlag Mykologia. ISBN 978-3-85604-030-7.
  9. Galli R. (2007). I Boleti. Atlante pratico-monographico per la determinazione dei boleti (in Italian) (3rd ed.). Milano, Italy: Dalla Natura.
  10. Watling R, Hills AE (2005). "Boletes and their allies (revised and enlarged edition)". In Henderson DM, Orton PD, Watling R (eds.). British Fungus Flora. Agarics and boleti. 1. Edinburgh, Scotland: Royal Botanic Garden.
  11. Loizides M, Bellanger JM, Assyov B, Moreau PA, Richard F (2019). "Present status and future of boletoid fungi (Boletaceae) on the island of Cyprus: cryptic and threatened diversity unraveled by 10-year study". Fungal Ecology. 41 (13): 65–81.
  12. Schenk-Jaeger KM, Rauber-Lüthy C, Bodmer M, Kupferschmidt H, Kullak-Ublick GA, Ceschi A (2012). "Mushroom poisoning: a study on circumstances of exposure and patterns of toxicity". European Journal of Internal Medicine. 23 (4): e85–e91. doi:10.1016/j.ejim.2012.03.014. PMID 22560399.
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