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Galerina

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Galerina
Galerina marginata
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Hymenogastraceae
Genus: Galerina
Earle (1909)
Type species
Galerina vittiformis
(Fr.) Singer (1950)
Subgenera

Galerina Kühner
Naucoriopsis Kühner
Tubariopsis Kühner

Synonyms[1]
  • Galerula P.Karst. (1879)
  • Pholidotopsis Earle (1909)
  • Velomycena Pilát (1953)

Galerina is a genus of small brown-spore saprobic mushroom-bearing fungi, with over 300 species found throughout the world from the far north to remote Macquarie Island in the Southern Ocean.[2][3] The genus is most noted for some extremely poisonous species which are occasionally confused with hallucinogenic species of Psilocybe. Galerina mushrooms are typically small and hygrophanous, with a slender and brittle stem. They are often found growing on wood, and when on the ground have a preference for mossy habitats.

Galerina means helmet-like.[4]

Taxonomic definition

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The genus Galerina is defined as small mushrooms of mycenoid stature, that is, roughly similar in form to Mycena species: a small conical to bell-shaped cap, and gills attached to a long and slender cartilaginous stem. Species have a pileipellis that is a cutis, and ornamented spores that are brown in deposit, where the spore ornamentation comes from an extra spore covering.

Description

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Galerina patagonica at Marriott Falls Track, Tasmania, Australia

Galerina fruiting bodies are typically small, undistinguished mushrooms with a typical "little brown mushroom" morphology and a yellow-brown, light brown to cinnamon-brown spore print. The pileus is typically glabrous and often hygrophanous, and a cortina-type veil is present in young specimens of roughly half of recognized species, though it sometimes disappears as the mushroom ages in many of these species.[citation needed] Microscopically, they are highly variable as well, though most species have spores that are ornamented, lack a germ pore, and have a plage. Many species also have characteristic tibiiform cystidia. However, there are many exceptions, and many species of Galerina lack one or more of these microscopic characteristics. Ecologically, all Galerina are saprobic, growing in habitats like rotting wood or in moss.[2]

The spores of Galerina feature an ornamentation that comes from the outer layer of the spore breaking up on maturity to produce either warts, wrinkles or "ears", flaps of material loosened from where the spore was attached to the basidia. This outer layer of the spore often is not complete, but has a clear patch in many species just above the attachment, this clear patch is called a plage. This plage is not evident in all species, and the spore covering does not always breakup in all species, making it sometimes difficult to correctly determine a mushroom of this genus.

The specific features that define the genus require a microscope to confirm. In the wild it can be difficult to determine a Galerina from a number of similar genera, such as Pholiota, Tubaria, Conocybe, Pholiotina, Agrocybe, Gymnopilus, Phaeogalera and Psilocybe. For the most part, Galerinas will be found associated with moss, and this can separate out the genus in nature fairly well. But this identification is more difficult in the section Naucoriopsis, which does not associate with moss, and is a decomposer of wood.

Phaeogalera is a genus that was segregated from Galerina by Robert Kühner.[5]

Phylogenetics

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The genus Galerina has recently been found to be polyphyletic,[2] consisting of at least three unrelated clades, although not all species were studied and for most currently recognized species is uncertain still in which they belong. Each of these clades corresponds to a subgenus of Galerina, as outlined by Kühner.[5] The great diversity of micromorphology found in Galerina is probably due to the polyphyly of the genus.

Selected species

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Main article: List of Galerina species

Galerina vittiformis is the type species of the genus Galerina. This species is common[where?] in beds of damp moss (along with many other species of Galerina). There are a number of variations of this species that have been named over the years: var. vittiformis f. vittiformis is a 2-spored species; var. vittiformis f. tetrasporis is a 4-spored form; var. pachyspora has been collected on Macquarie Island.[3]

Galerina patagonica has a Gondwanan distribution.[6] Galerina hypnorum is a widespread species.

Galerina graminea can survive in moss-free grass, unlike many Galerina mushrooms. It was known for many years as 'Galerina laevis', proposed by Christiaan Hendrik Persoon.

Several Galerina species are listed by the US Forest Service as "species of special concern" in the Northwest Forest Plan.[7] These species are considered indicator species for old growth coniferous forest in the Pacific Northwest: Galerina atkinsonia,[8] Galerina cerina,[9] Galerina heterocystis,[9] Galerina sphagnicola,[9] and Galerina vittiformis.[10]

Toxicity of some species

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Many (though not all) Galerina contain alpha-amanitin and other amatoxins.[11]

Galerina marginata (also known as "autumn skullcap", "deadly galerina", etc.) is a poisonous species[12] found throughout the temperate regions of the world, in habitats as diverse as forests and urban parklands, wherever rotting wood is found. In 2001, DNA studies found that Galerina autumnalis and five other species of Galerina with similar morphologies were, in fact, synonyms of Galerina marginata.[13]

Galerina sulciceps, is a lethal species found in Indonesia and responsible for deaths there. One study found it more toxic than Amanita phalloides.[14]

Galerina steglichii is very rare, bruises blue and contains the hallucinogen psilocybin.[15][16]

Identification

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The extreme toxicity of some Galerina species means that recognition of Galerina is of great importance to mushroom hunters who are seeking hallucinogenic Psilocybe mushrooms. Species like Galerina marginata may bear a superficial resemblance to Psilocybe cyanescens and other Psilocybe species, and has often been found growing amongst and around Psilocybe cyanescens and other Psilocybe species, making identification all the more confusing to the uninitiated. Galerina can be distinguished from psilocybin Psilocybe by the following characteristics:

  • Spore print color: blackish-brown to lilac-brown in Psilocybe, light brown to rusty brown in Galerina. Spore color can be seen by taking a spore print or by looking for evidence of spore drop on the stipe or on surrounding mushrooms.
  • Staining reaction: Psilocybin Psilocybe fruiting bodies stain blue to varying degrees when bruised, while Galerina do not. The strength of this reaction varies with the amount of psilocin present in the tissues of the mushroom.[17] Fruiting bodies with little psilocin (such as Psilocybe semilanceata, with high psilocybin and low psilocin content) will stain weakly if at all, while sporocarps with a high psilocin content will stain strongly blue. Only one rare Galerina has blue-staining tissue, though in some cases the flesh will blacken when handled, and this may be misinterpreted as a bluing reaction.[18]

Although these rules are specific to the separation of Galerina from certain Psilocybe, since mixed patches of Psilocybe and Galerina can occur, it is essential to be sure of the identity of each sporocarp collected.

Galerina also present some risk of confusion with several species of small edible mushrooms, notably Kuehneromyces mutabilis[19] and candy caps (L. camphoratus and allies).[20][21]

References

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  1. ^ "Galerina Earle 1909". MycoBank. International Mycological Association. Retrieved 2011-12-24.
  2. ^ a b c Gulden GØ, Stensrud K, Shalchian-Tabrizi K, Kauserud H (2005). "Galerina Earle: A polyphyletic genus in the consortium of dark-spored agarics" (PDF). Mycologia. 97 (4): 823–837. doi:10.3852/mycologia.97.4.823. PMID 16457352.
  3. ^ a b Wood AE (2001). "Studies in the genus Galerina (Agaricales) in Australia". Australian Systematic Botany. 14 (4): 615–676. doi:10.1071/SB99016.
  4. ^ Mushrooms of West Virginia and the Central Appalachians by William C. Roody
  5. ^ a b Kühner R. (1972). "Agaricales de la zone alpine: Genres Galera Earle et Phaeogalera gen. nov". Bulletin Trimestriel de la Société Mycologique de France. 88: 41–153.
  6. ^ Laursen GA, Horak E, Taylor DL (2005). "Galerina patagonica Singer from Gondwanian mainland AU and NZ, their subantarctic islands, and Patagonia". Proceedings of the Annual Meeting of the Mycological Society of Japan. 49: 149.
  7. ^ Castellano MA, Cázares E, Fondrick B, Dreisbach T (2003). "Part 1". Handbook to additional fungal species of special concern in the Northwest Forest Plan (General Technical Report PNW-GTR-572) (PDF). Portland, OR: USDA, Forest Service, Pacific Northwest Research Station. p. 144 p. (Hereafter referred to as "Castellano, et al. 2003.")
  8. ^ Castellano, et al. 2003. Part 4.
  9. ^ a b c Castellano, et al. 2003. Part 5.
  10. ^ Castellano, et al. 2003. Part 6.
  11. ^ Enjalbert F, Cassanas G, Rapior S, Renault C, Chaumont JP (2004). "Amatoxins in wood-rotting Galerina marginata" (PDF). Mycologia. 96 (4): 720–729. doi:10.2307/3762106. JSTOR 3762106. PMID 21148893. Archived from the original (PDF) on 2011-07-18.
  12. ^ Enjalbert F, Cassanas G, Rapior S, Renault C, Chaumont J-P (2004). "Amatoxins in wood-rotting Galerina marginata". Mycologia. 96 (4): 720–729. doi:10.2307/3762106. JSTOR 3762106. PMID 21148893.
  13. ^ Gulden G, Dunham S, Stockman J (2001). "DNA studies in the Galerina marginata complex". Mycological Research. 105 (4): 432–440. doi:10.1017/S0953756201003707.
  14. ^ Klán J. (1993). "Prehled hub obsahujících amanitiny a faloidiny [A review of mushrooms containing amanitins and phalloidines]". Časopis Lékařů Českých. 132 (15): 449–451.
  15. ^ Gartz J. (1995). "Cultivation and analysis of Psilocybe species and an investigation of Galerina steglichi". Annali Museo Civico di Rovereto. 10: 297–306. Archived from the original on 2013-07-26. Retrieved 2007-01-10.
  16. ^ Besl H. (1993). "Galerina steglichii spec. nov, ein halluzinogener Haeubling". Zeitschrift für Mykologie. 59: 215–218.
  17. ^ Stamets P. (1996). Psilocybin Mushrooms of the World: An Identification Guide. Berkeley, California: Ten Speed Press. p. 53. ISBN 978-0-89815-839-7.
  18. ^ Kuo M. (2004). "Galerina marginata ("Galerina autumnalis")". MushroomExpert.com.
  19. ^ Enjalbert F, Cassacas G, Rapior S, Renault C, Chaumont J-P (2004). "Amatoxins in wood-rotting Galerina marginata". Mycologia. 96 (4): 720–9. doi:10.2307/3762106. JSTOR 3762106. PMID 21148893.
  20. ^ Campbell D. (2004). "The candy cap complex" (PDF). Mycena News. 55 (3): 3–4. Retrieved 2015-06-07. (scroll down)
  21. ^ Kuo M. (2007). "Lactarius camphoratus". MushroomExpert.com. Retrieved 2009-02-16.

Further reading

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