Boletus satanas

Boletus satanas Conservation status Rare / British Red Data List Scientific classification Kingdom: Fungi Division: Basidiomycota Class: Agaricomycetes Order: Boletales Family: Boletaceae Genus: Boletus Species: B. satanas Binomial name Boletus satanas Lenz Boletus satanas Mycological characteristics pores on hymenium cap is convex hymenium is adnate stipe is bare spore print is olive ecology is mycorrhizal edibility: poisonous

Boletus satanas, commonly known as the Devil's bolete or Satan's mushroom, is a basidiomycete fungus of the bolete family. Found on chalky soil in mixed woodlands in the southern, warmer regions of Europe and North America, it is generally regarded as a poisonous mushroom, with predominantly gastrointestinal symptoms of nausea and vomiting occurring if eaten raw. However, reports of poisoning are rare due to its odd appearance and at times putrid smell minimising casual experimentation. There are reports of its traditional consumption in the former Czechoslovakia, Italy and San Francisco Bay Area after thorough cooking.

The squat, brightly coloured fruiting bodies are large and imposing, with a pale dull-coloured velvety cap up to 30 cm (12 in) wide, blood red pores and bulbous red-patterned stalk. The flesh turns blue when cut or bruised. There is a smell of carrion, more noticeable with age. It is the largest bolete growing in Europe.

Taxonomy

Boletus satanas was described by German mycologist Harald Othmar Lenz in 1831, who gave it its sinister name, σατανᾶς satanas 'of Satan', derived from Hebrew via Ancient Greek,^[1] after he felt ill from its "emanations" while describing it. He also knew of several reports of diarrhoea and sickness from those who had eaten it.^[2] American mycologist Harry D. Thiers concluded that material from North America matches the species description, although some authorities have questioned this.^[3]

Both it and Boletus luridus are known as ayimantari 'bear mushroom' in Eastern Turkey.^[4]

Description

The compact cap can be up to 30 cm (12 in) in diameter. At first it is hemispheric with an inrolled margin, later flattening in the shape of a pad, and in older specimens it is bent irregularly. When young, the pileus is greyish white, when older it tends more to a greenish ochre or leather colour.

View of stipe and pore surface

The surface of the cap is finely tomentose, becomes smooth later and often slightly sticky in wet weather. It does not peel. The free to slightly adnate tubes are up to 3 mm (⅛ in) long. At first they are pale yellow or greenish yellow before soon reddening and are already entirely purplish red or carmine before full maturity. The spore print is olive green and spores are spindle-shaped and 10-16 μm long when viewed under a microscope.^[5] The stipe is 5–12 cm (2–4¾ in) long and is often very bulbous (4–10 cm/1½–4 inches); usually it is wider than it is long and when young it is even almost spherical. It has a yellow background covered with a hexagonal close-meshed net that starts bright red and turns dark blood-red and which sometimes reaches to the yellowish base layer.^[5]

The flesh is whitish, though may be yellow to pale ochre when young. It slowly turns a faded blue colour when broken or bruised, although the stem bruises red. The smell is weak when the mushroom is young, but becomes putrid in older specimens, reminiscent of carrion. Young specimens reportedly have a pleasant nutty taste.^[5]

Similar species

The Devil's bolete can be confused with other boletes such as:

• B. erythropus
• B. calopus
• B. luridus
• B. rhodoxanthus
• B. legaliae (= B. splendidus)
• B. torosus

Distribution and habitat

The Devil's bolete is found in the entire temperate zone, but in Europe it definitely occurs more in southern regions. It is only found in the south of England.^[1] It is rare in Scandinavia, occurring only on a few islands in the Baltic Sea where the conditions are perfect, with highly calcareous (chalky) soil.^[1] It has been recorded in the Black Sea and eastern Anatolia regions of Turkey.^[4][6] Also, it has been recorded from Iran.^[7] It has been recorded from coastal areas of California, with a possible record from the southeastern US, and could feasibly occur in the Pacific Northwest.^[8] It grows in hardwood forests, mainly under beech (Fagus) in Europe, and oak (Quercus) in North America. It appears in summer and the beginning of the autumn in the southernmost areas. It is rather rare in the north, as it grows only in hot and sunny periods. It fruits in autumn.^[8]

Toxicity

Illustration by artist Albin Schmalfuß, 1897

The Devil's bolete is poisonous, especially when eaten raw, but also when cooked. The symptoms, which are predominantly gastrointestinal in nature, include violent vomiting, which can last up to six hours. However, English mycologist John Ramsbottom reported in 1953 that it is consumed in parts of Italy and the former Czechoslovakia.^[2] Furthermore, some in the San Francisco Bay Area report having eaten it regularly without ill effects.^[3] However, all agree it must always be cooked. Ramsbottom speculated that there may be a regional variation in the toxicity, and concedes it may not be as poisonous as widely reported.^[2] This has been echoed by some contemporary mycologists; Boletus satanas is rarely sampled casually due to its putrid smell and blue bruising.^[9]

Muscarine has been isolated from fruiting bodies, but the quantities are believed to be far too small to account for its toxic effects.^[9] More recently, the glycoprotein bolesatine has been isolated.^[10] Bolesatine is a protein synthesis inhibitor, and, when given to mice, causes hepatic blood stasis and thrombosis.^[11]

See also

Fungi portal

• List of Boletus species

References

1. ^ ^{a b c} Nilson S, Persson O (1977). Fungi of Northern Europe 1: Larger Fungi (Excluding Gill-Fungi). Penguin. p. 104. ISBN 0-14-063005-8. 
2. ^ ^{a b c} Ramsbottom J (1953). Mushrooms & Toadstools. Collins. pp. 53–54. ISBN 1870630092. 
3. ^ ^{a b} Thiers HD (1975). California Mushrooms -- A Field Guide to the Boletes. New York: Hafner Press. p. 58. ISBN 0028534107. 
4. ^ ^{a b} Demirel K, Uzun Y, Kaya A (2004). "Some Poisonous Fungi of East Anatolia" (PDF). Turk J Bot 28: 215–19. http://journals.tubitak.gov.tr/botany/issues/bot-04-28-1-2/bot-28-1-2-23-0207-2.pdf. Retrieved 2008-02-08. 
5. ^ ^{a b c} Zeitlmayr L (1976). Wild Mushrooms:An Illustrated Handbook. Garden City Press, Hertfordshire. p. 102. ISBN 0-584-10324-7. 
6. ^ Sesli E (2007). "Preliminary checklist of macromycetes of the East and Middle Black Sea Regions of Turkey" (PDF). Mycotaxon 99: 71–74. http://www.mycotaxon.com/resources/checklists/sesli-v99-checklist.pdf. Retrieved 2008-01-28. 
7. ^ Asef Shayan, M.R. (2010) (in Persian). قارچهای سمی ایران (Qarch-ha-ye Sammi-ye Iran) [Poisonous mushrooms of Iran]. Iran shenasi. p. 214. ISBN 978-964-2725-29-8. 
8. ^ ^{a b} Ammirati JA, Traquair JA, Horgen PA (1985). Poisonous Mushrooms of the Northern United States and Canada. Minneapolis: University of Minnesota Press. pp. 241–42. ISBN 0-8166-1407-5. 
9. ^ ^{a b} Benjamin, Denis R. (1995). Mushrooms: poisons and panaceas — a handbook for naturalists, mycologists and physicians. New York: WH Freeman and Company. p. 359. ISBN 0-7167-2600-9. 
10. ^ Kretz O, Creppy EE, Dirheimer G (1991). "Characterization of bolesatine, a toxic protein from the mushroom Boletus satanas Lenz and it's effects on kidney cells". Toxicology 66 (2): 213–24. doi:10.1016/0300-483X(91)90220-U. PMID 1707561. 
11. ^ Ennamany R, Bingen A, Creppy EE, Kretz O, Gut JP, Dubuisson L, Balabaud C, Sage PB, Kirn A., R.; Bingen, A.; Creppy, E.E.; Kretz, O.; Gut, J.P.; Dubuisson, L.; Balabaud, C.; Sage, P.B. et al. (1998). "Aspirin (R) and heparin prevent hepatic blood stasis and thrombosis induced by the toxic glycoprotein Bolesatine in mice". Human & Experimental Toxicology 17 (11): 620–624. doi:10.1191/096032798678908017. 

• North, Pamela (1967). Poisonous Plants and Fungi in colour. Blandford Press & Pharmacological Society of Great Britain.