Tricholoma terreum

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Tricholoma terreum
Tricholoma terreum 20061105wa.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Tricholomataceae
Genus: Tricholoma
Species:
T. terreum
Binomial name
Tricholoma terreum
(Schaeff.) P.Kumm. (1871)
Synonyms
  • Agaricus terreumSchaeff. (1774)
  • Tricholoma myomyces(Pers.) J.E.Lange
Tricholoma terreum
Information icon.svg
Gills icon.png Gills on hymenium
Convex cap icon.svgFlat cap icon.svg Cap is convex or flat
Adnexed gills icon2.svg Hymenium is adnexed
Bare stipe icon.svg Stipe is bare
Transparent spore print icon.svg
Transparent spore print icon.svg
Spore print is white to cream
Mycorrhizal fungus.svgEcology is mycorrhizal
Mycomorphbox Edible.pngEdibility is edible

Tricholoma terreum, commonly known as the grey knight or dirty tricholoma, is a grey-capped mushroom of the large genus Tricholoma . It is found in coniferous woodlands in Europe, and has also been encountered under introduced pine trees in Australia and New Zealand. It is regarded as edible. A 2014 article speculated that it may be poisonous, [1] but Sitta et al. in 2016 published in the same journal a counter article demonstrating the unfounded nature of such speculation. [2]

Contents

Taxonomy

The fungus was originally described as Agaricus terreus by Jacob Christian Schäffer in 1762, and as Agaricus myomyces by mycologist Christian Hendrik Persoon in 1794. It was given its current binomial name by German Paul Kummer in 1871. It is commonly known as the grey knight [3] from its discoloured gills. [4]

Almost all modern sources consider Tricholoma myomyces to be a synonym of T. terreum, [5] [6] [7] but there are some exceptions. [8] Bon mentions that T. myomyces has been defined for lowland mushrooms with white gills and a fleecy cap and Courtecuisse separates it on the same basis. [9] [10] Moser distinguished T. myomyces on the basis that the gills should go yellow. [11]

Description

The cap is 4–7 centimetres (1+122+34 inches) wide and evenly covered in fine grey scales. Convex with a slight boss, it is broadly conical in shape. The whitish stipe is 3–8 centimetres (1+143+14 inches) high and 1.5 centimetres (12 inch) wide and has no ring. There is no ring or volva. The whitish flesh is thin, easily broken, and has a pleasant mild (not mealy) smell and taste. The widely spaced and uneven gills are free (unattached to the stipe). The spore print is white, the oval spores 6–7  μm long by 3.5–4.4 μm wide. [3] [4]

It could be confused with the larger (and poisonous) T. pardinum has a mealy smell and cap scales; the edible T. orirubens has fine dark scales and pinkish gills. [12]

Distribution and habitat

Tricholoma terreum is found in Europe, where fruiting bodies appear under conifers, particularly pine and spruce, from late summer to late autumn. [3] They may also arise in parks near these trees, and grow in fairy rings. [4] They are generally in quite densely populated groups though not bunched. It has been recorded growing under exotic Pinus radiata plantations in Australia. [13] [14]

Edibility

With a mild taste, the species used to be regarded as a good edible. It is seen in markets in France, along with Clitocybe nebularis and Tricholoma portentosum . [4] However, some authorities recommend that inexperienced pickers avoid all grey tricholomas. [15] Recent chemical tests show that this species may contain toxins which can cause rhabdomyolysis. [1] However, from more recent investigations it has emerged that only an abnormal quantity of Tricholoma mushrooms may trigger the rhabdomyolysis and normal consumption of about 200g of mushroom is safe unless there is an individual reaction. [16] A 2024 study also tested for and concluded that toxin levels were negligible enough for T. terreum for it to be considered an edible mushroom. [17]

See also

Related Research Articles

<i>Inosperma erubescens</i> Species of fungus

Inosperma erubescens, and also commonly known as the deadly fibrecap, brick-red tear mushroom or red-staining Inocybe, is a poisonous basidiomycete fungus, one of many in the original genus Inocybe and one of the few known to have caused death. It is found growing in small groups on leaf litter in association with beech. All mushroom guidebooks as well as mushroom hunters advise that the entire Inocybaceae should be avoided for consumption. The fruit bodies appear in spring and summer; the bell-shaped caps are generally pale pinkish in colour with red stains, which can also be seen on the stipe and gills.

<i>Calocybe gambosa</i> Species of fungus

Calocybe gambosa, commonly known as St. George's mushroom, is an edible mushroom that grows mainly in fields, grass verges and roadsides. Deriving its common name from when it first appears in the UK, namely on St George's Day. It appears in March in Italy, a warmer country where it is also a popular mushroom to eat, and is known there as prugnolo. It is also popular in Northern Spain and Southern France, in the Basque Country region and its surroundings where it appears in April. In these regions it is usually eaten sautéed with egg or with bacon.

<i>Entoloma sinuatum</i> Species of poisonous fungus in the family Entolomataceae found across Europe and North America

Entoloma sinuatum is a poisonous mushroom found across Europe and North America. Some guidebooks refer to it by its older scientific names of Entoloma lividum or Rhodophyllus sinuatus. The largest mushroom of the genus of pink-spored fungi known as Entoloma, it is also the type species. Appearing in late summer and autumn, fruit bodies are found in deciduous woodlands on clay or chalky soils, or nearby parklands, sometimes in the form of fairy rings. Solid in shape, they resemble members of the genus Tricholoma. The ivory to light grey-brown cap is up to 20 cm (7.9 in) across with a margin that is rolled inward. The sinuate gills are pale and often yellowish, becoming pink as the spores develop. The thick whitish stem has no ring.

<i>Tricholoma equestre</i> Species of fungus

Tricholoma equestre or Tricholoma flavovirens, commonly known as the man on horseback or yellow knight is a widely eaten but arguably toxic fungus of the genus Tricholoma that forms ectomycorrhiza with pine trees.

<i>Tricholoma argyraceum</i> Species of fungus

Tricholoma argyraceum is a grey-capped mushroom of the large genus Tricholoma. It has been often confused with the similar-looking Tricholoma scalpturatum.

<i>Tricholoma sulphureum</i> Species of fungus

Tricholoma sulphureum, also known as the stinker, sulphur knight or gas agaric, is an inedible or mildly poisonous mushroom found in woodlands in Europe. It has a distinctive bright yellow colour and an unusual smell likened to coal gas. It occurs in deciduous woodlands in Europe from spring to autumn.

<i>Agaricus arvensis</i> Species of fungus

Agaricus arvensis, commonly known as the horse mushroom, is a mushroom-forming fungus of the genus Agaricus.

<i>Tricholoma pardinum</i> Species of agaric fungus endemic to North America, Europe, and parts of Asia

Tricholoma pardinum, commonly known as spotted tricholoma, tiger tricholoma, tigertop, leopard knight, or dirty trich, is a gilled mushroom widely distributed across North America, Europe, and parts of Asia. It is generally found in beech woodland in summer and autumn. Two subspecies have been described from southern Europe. First officially described by Christiaan Hendrik Persoon in 1801, T. pardinum has had a confusing taxonomic history that extends over two centuries. In 1762, German naturalist Jacob Christian Schäffer described the species Agaricus tigrinus with an illustration corresponding to what is thought to be T. pardinum, and consequently, the name Tricholoma tigrinum has been used erroneously in some European field guides.

<i>Clitocybe nebularis</i> Species of fungus

Clitocybe nebularis or Lepista nebularis, commonly known as the clouded agaric, cloudy clitocybe, or cloud funnel, is an abundant gilled fungus which appears both in conifer-dominated forests and broad-leaved woodland in Europe and North America. Appearing in Britain from mid to late autumn, it is edible, but may cause gastrointestinal issues.

<i>Amanita echinocephala</i> Species of fungus

Amanita echinocephala is a large, whitish or ivory-coloured mushroom with a characteristic spiny, or warty-looking cap. A. solitaria is a synonym and opinions are divided as to which name takes precedence. It lives on chalky soils with beech trees, and appears earlier than most mushrooms of similar size in southern England. It frequently occurs singly or in small groups, resulting in it being referred to as the solitary amanita or, more specifically, European solitary lepidella. It is very drought-tolerant.

<i>Tricholoma saponaceum</i> Species of fungus

Tricholoma saponaceum, also known as the soap-scented toadstool, soapy tricholoma, soapy knight or soap tricholoma is an inedible mushroom found in woodlands in Europe and North America.

<i>Lepiota clypeolaria</i> Species of fungus

Lepiota clypeolaria, commonly known as the shield dapperling or the shaggy-stalked Lepiota, is a common mushroom in the genus Lepiota. It is widely distributed in northern temperate zones, where it grows in deciduous and coniferous forest. Fruit bodies have a brownish cap, a shaggy stipe with a collapsed, sheathing ring or ring zone, and spindle-shaped spores.

<i>Tricholoma columbetta</i> Species of fungus

Tricholoma columbetta, commonly known as dove-coloured tricholoma, is an edible mushroom of the large genus Tricholoma. It is found in Europe, where it is eaten in France.

<i>Tricholoma tigrinum</i> Species of fungus

Tricholoma tigrinum is a gilled mushroom. First described under the name Agaricus tigrinus by Jacob Christian Schäffer in 1774, the species was transferred to the genus Tricholoma in 1871 by Paul Kummer.

<i>Tricholoma myomyces</i> Species of fungus

Tricholoma myomyces is a mushroom of the agaric genus Tricholoma, usually considered to be a synonym of Tricholoma terreum. The species was first described scientifically by Christian Hendrik Persoon in 1794 as Agaricus myomyces, and later transferred to the genus Tricholoma by Danish mycologist Jakob Emanuel Lange in 1933. It is found in Europe and northern North America.

<i>Tricholoma atrosquamosum</i> Species of fungus

Tricholoma atrosquamosum, commonly known as dark-scaled knight, is an edible gilled mushroom native to Europe. The grey-capped fruit bodies are generally found singly or in small groups in deciduous woodland on chalk-based soils.

<i>Tricholoma vaccinum</i> Fungus of the agaric genus Tricholoma

Tricholoma vaccinum, commonly known as the russet scaly tricholoma, the scaly knight, or the fuzztop, is a fungus of the agaric genus Tricholoma. It produces medium-sized fruit bodies (mushrooms) that have a distinctive hairy reddish-brown cap with a shaggy margin when young. The cap, which can reach a diameter of up to 6.5 cm (2.6 in) wide, breaks up into flattened scales in maturity. It has cream-buff to pinkish gills with brown spots. Its fibrous, hollow stipe is white above and reddish brown below, and measures 4 to 7.5 cm long. Although young fruit bodies have a partial veil, it does not leave a ring on the stipe.

<i>Cortinarius camphoratus</i> Species of fungus

Cortinarius camphoratus, commonly known as the goatcheese webcap, is an agaric fungus in the family Cortinariaceae. The fungus is found in Europe and North America, where its fruit bodies (mushrooms) grow on the ground in a mycorrhizal association with spruce and firs in coniferous forests. Mushrooms are characterized by pale blue lilac colors when young, and a strong distinctive odor. Sources disagree as to the edibility of the mushroom, but they are generally not recommended for eating.

<i>Lepiota cristata</i> Species of fungus

Lepiota cristata, commonly known as the stinking dapperling, brown-eyed parasol, or the stinking parasol, is an agaric and possibly poisonous mushroom in the family Agaricaceae. A common and widespread species—one of the most widespread fungi in the genus Lepiota—it has been reported from Europe, northern Asia, North America, and New Zealand. It fruits on the ground in disturbed areas, such as lawns, path and road edges, parks, and gardens. The species produces fruit bodies characterized by the flat, reddish-brown concentric scales on the caps, and an unpleasant odour resembling burnt rubber. Similar Lepiota species can sometimes be distinguished from L. cristata by differences in cap colour, stipe structure, or odour, although some species can only be reliably distinguished through the use of microscopy.

<i>Tricholoma vernaticum</i> Species of fungus

Tricholoma vernaticum is an agaric fungus of the genus Tricholoma native to the Pacific Northwest region of the United States. The fungus was originally described in 1976 as a species of Armillaria when that genus was more inclusive; it received its current name twenty years later. The stout fruit bodies (mushrooms) have moist white to grayish caps, a membranous ring on the stipe, and an odor resembling cucumbers. Mycorrhizal with conifers, the fungus fruits in the spring or early summer, with its mushrooms appearing on the ground singly or in groups at high elevations, often at the edge of melting snowbanks. The edibility of the mushroom is unknown, but it has a strong unpleasant odor and a mealy taste.

References

  1. 1 2 Heping Xia: Fatal toxins found in 'edible' wild mushrooms, in: Chemistry World, 16 June 2014
  2. Paolo Davoli, Marco Floriani, Francesca Assisi, Karl Kob, Nicola Sitta: Comment on “Chemical and Toxicological Investigations of a Previously Unknown Poisonous European Mushroom Tricholoma terreum, in: Chemistry Europe. First published: 10 March 2016, doi:10.1002/chem.201406655
  3. 1 2 3 Phillips, Roger (2006). Mushrooms. Pan MacMillan. p. 107. ISBN   978-0-330-44237-4.
  4. 1 2 3 4 Lamaison, Jean-Louis; Polese, Jean-Marie (2005). The Great Encyclopedia of Mushrooms. Könemann. p. 89. ISBN   978-3-8331-1239-3.
  5. "Tricholoma terreum page". Species Fungorum. Royal Botanic Gardens Kew. Retrieved 2017-03-22.
  6. "Tricholoma terreum (Schaeff.) P. Kumm., 1871 Synonyms". Global Biodiversity Information Facility. GBIF. Retrieved 2017-03-22.
  7. "Tricholoma terreum (Schaeff.) P. Kumm., 1871 Synonyms". Dyntaxa (in Swedish). Swedish University of Agricultural Sciences. Retrieved 2017-03-22.
  8. Bessette AE, Bessette AR, Trudell SA, Roody WC (2013). Tricholomas of North America: A Mushroom Field Guide. Austin, Texas: University of Texas Press. p. 108.
  9. Marcel Bon (1987). The Mushrooms and Toadstools of Britain and North-Western Europe. Hodder & Stoughton. p. 154. ISBN   978-0-340-39935-4.
  10. Courtecuisse, R.; Duhem, B. (2013). Champignons de France et d'Europe (in French). Delachaux et Niestlé. p. 194. ISBN   978-2-603-02038-8. Also available in English.
  11. Meinhard Moser (1983). Keys to Agarics and Boleti. Translated by Simon Plant. London: Roger Phillips. pp. 129–130. ISBN   978-0-9508486-0-0.
  12. Haas, Hans (1969). The Young Specialist looks at Fungi. Burke. p. 144. ISBN   978-0-222-79409-3.
  13. Grey, Ed and Pat (2006). "FNCV FUNGI GROUP FORAY: LERDEGERG RIVER WALK, JACK CANN RESERVE, BLACKWOOD, 2 July 2006" (PDF). Royal Botanic Gardens Melbourne website- fungimap section. Royal Botanic Gardens Melbourne. Archived from the original (PDF) on August 29, 2008. Retrieved 2009-02-21.
  14. Keane, Philip J.; Kile GA; Podger FD (2000). Diseases and Pathogens of Eucalypts. Canberra: CSIRO Publishing. p. 84. ISBN   978-0-643-06523-9.
  15. Zeitlmayr, Linus (1976). Wild Mushrooms: An Illustrated Handbook. Garden City Press, Hertfordshire. pp. 72–73. ISBN   978-0-584-10324-3.
  16. Piotr Rzymski, Piotr Klimaszyk: Is the Yellow Knight Mushroom Edible or Not? A Systematic Review and Critical Viewpoints on the Toxicity of Tricholoma equestre, Wiley online library, first published: 25 July 2018, doi:10.1111/1541-4337.12374
  17. Clericuzio, Marco; Serra, Stefano; Vidari, Giovanni (15 April 2024). "No Evidence Was Found for the Presence of Terreolides, Terreumols or Saponaceolides H-S in the Fruiting Bodies of Tricholoma terreum (Basidiomycota, Agaricales)". Molecules (journal) . 29 (8).