Galiella rufa

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Galiella rufa
Galiella rufa 87995.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Pezizomycetes
Order: Pezizales
Family: Sarcosomataceae
Genus: Galiella
Species:
G. rufa
Binomial name
Galiella rufa
(Schwein.) Nannf. & Korf (1957)
Synonyms [1]
  • Bulgaria rufaSchwein. (1832)
  • Gloeocalyx rufa(Schwein.) Sacc. (1913)

Galiella rufa, commonly known as the rubber cup, the rufous rubber cup, or the hairy rubber cup, is a species of fungus in the family Sarcosomataceae. It produces cup-shaped fruit bodies with the texture of tough, gelatinous rubber, with a rough, blackish-brown, felt-like outer surface and a smooth reddish-brown inner surface.

Contents

Found throughout eastern and Midwest North America as well as in Malaysia, the fruit bodies typically grow in clusters on branches and exposed portions of buried wood. Although generally considered inedible by North American mushroom field guides, the species is commonly consumed in Malaysia. It also produces several natural products.

Taxonomy

The species was originally named Bulgaria rufa in 1832 by Lewis David de Schweinitz, based on material collected from Bethlehem, Pennsylvania. [2] In 1913, Pier Andrea Saccardo transferred it to the genus Gloeocalyx as defined by George Edward Massee in 1901 (a genus now synonymous with Plectania ) [3] due to its hyaline (translucent) spores. [4] Richard Korf made it the type species of his newly created Galiella in 1957, a genus that encompasses bulgarioid species (those with a morphology similar to those in Bulgaria ) with spores that feature surface warts that are made of callose-pectic substances that stain with methyl blue dye. [5]

In 1906, Charles Horton Peck described the variety magna from material collected in North Elba, New York. Peck explained that the variety differed from the typical species in several ways: var. magna grew among fallen leaves under balsam fir trees, or among mosses on the ground, not on buried wood; it lacked a stem, and was instead broad and rounded underneath; its hymenium was more yellow-brown then the nominate variety; and, its spore were slightly longer. [6]

The specific epithet rufa means "rusty" or reddish-brown", and refers to the color of the hymenium. [7] The species is commonly named the "rubber cup", [8] the "rufous rubber cup", [9] or the "hairy rubber cup". [7] In Sabah, it is known as mata rusa (deer eyes), and in Sarawak, mata kerbau (buffalo eyes). [10]

Description

The interior flesh is translucent and gelatinous. Galiella rufa 147747.jpg
The interior flesh is translucent and gelatinous.

The fruit bodies of G. rufa are initially closed and roughly spherical to top-shaped, and resemble minute puffballs. They later open in the shape of a shallow cup, and reach diameters of 15–35 mm (1⁄2–1+1⁄2 in) wide. [11] The cup margin is curved inwards and irregularly toothed; the teeth are a lighter color than the hymenium. [9] The interior surface of the cup, which bears the spore-bearing surface (the hymenium) is reddish-brown to orange-brown. The exterior surface is blackish-brown, and covered with hairs that measure 7–8  μm long that give it a felt-like or hairy texture. [12] The flesh of the fruit body lacks any distinctive taste or odor, [7] and is grayish, translucent, gelatinous and rubbery. [11] The fungus sometimes has a short stem that is up to 10 mm (3⁄8 in) long by 5 mm (1⁄4 in) wide, but it may be missing in some specimens. [11] Dried fruit bodies become leathery and wrinkled. [12]

The spores are thin-walled, elliptical with narrowed ends, and covered with fine warts; they have dimensions of 10–22 by 8–10 μm. Both the spores and the asci (spore-bearing cells) are nonamyloid. [11] The asci are narrow and typically 275–300 μm long. [13] The paraphyses (sterile cells interspersed among the asci in the hymenium) are slender threadlike. [12] Ultrastructural studies have demonstrated that the development of the spore wall in G. rufa is similar to the genus Discina (in the family Helvellaceae) and to the other Sarcosomataceae, especially Plectania nannfeldtii ; both of these species have fine secondary wall spore ornaments. [14]

Similar species

Bulgaria inquinans.png
1992-04-26 Sarcosoma globosum 31212.jpg
Wolfina aurantiopsis 74602.jpg
Selected lookalikes: (1)  Bulgaria inquinans , (2)  Sarcosoma globosum , and (3)  Wolfina aurantiopsis

The similar species Galiella amurense is found in north temperate Asia, where it grows on the rotting wood of Spruce trees; it has larger ascospores than G. rufa, typically 26–41 by 13–16 µm. [15] Bulgaria inquinans is similar in shape and size, but has a shiny black hymenium. [11] Sarcosoma globosum , found in eastern North American, is black, has a wetter interior than G. rufa, and is larger—up to 10 cm (4 in) across. [9] Wolfina aurantiopsis has a shallower, woodier fruit body with a yellowish inner surface. [7]

Dissingia and Jafnea species may be similar in color, but not in overall consistency. [16]

Distribution and habitat

Galiella rufa is found in the Midwest and eastern North America, specifically being collected in areas between New York and Minnesota, and Missouri and North Carolina. [12] The species is also found in Malaysia. [10]

It is a saprobic species, and can grow solitarily, but more usually in groups or in clusters on decaying hardwood branches and logs. The fungus fruits in late summer and autumn. [11] The fungus has been noted to fruit readily on logs used for the cultivation of the shiitake mushroom. [17] The fruit bodies are readily overlooked as they blend in with their surroundings. [18]

Uses

Although the fruit bodies are generally considered by North American field guides to be inedible, [7] [13] or of unknown edibility, [11] in parts of Malaysia it is commonly eaten, and even considered a delicacy. [10]

Bioactive compounds

Galiella rufa produces several structurally related hexaketide compounds that have attracted attention for their biological properties, e.g. pregaliellalactone and galiellalactone. [19] The compounds have anti-nematodal activity, killing the nematodes Caenorhabditis elegans and Meloidogyne incognita . [20] These compounds have been shown to inhibit the early steps of the biosynthetic pathways induced by plant hormones known as gibberellic acids, and also inhibit the germination of seeds of several plants. [21] Galiellalactone is additionally a highly selective and potent inhibitor of interleukin 6 (IL-6) signaling in HepG2 cells. IL-6 is a multifunctional cytokine which is produced by a large variety of cells and functions as a regulator of immune response, acute phase reactions, and hematopoiesis. Researchers are interested in the potential of small-molecule inhibitors (such as the ones produced by G. rufa) to interfere with the IL-6 signaling cascade that leads to the expression of genes involved in disease. [22]

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References

  1. ↑ "Galiella rufa (Schwein.) Nannf. & Korf 1957". MycoBank. International Mycological Association. Retrieved 2011-06-25.
  2. ↑ von Schweinitz DL. (1832). "Synopsis fungorum in America boreali media degentium". Transactions of the American Philosophical Society (in Latin). 4 (2): 178. doi:10.2307/1004834. JSTOR   1004834.
  3. ↑ Kirk PM, Cannon PF, Minter DW, Stalpers JA (2008). Dictionary of the Fungi (10th ed.). Wallingford, UK: CABI. p. 284. ISBN   978-0-85199-826-8.
  4. ↑ Saccardo PA, Trotter A (1913). "Supplementum Universale, Pars IX". Sylloge Fungorum: Supplementum Universale (in Latin). 22: 726.
  5. ↑ Korf RP. (1957). "Two bulgarioid genera: Galiella and Plectania". Mycologia. 49 (1): 107–111. doi:10.2307/3755734. JSTOR   3755734.
  6. ↑ Peck CH. (1906). "Report of the State Botanist" (PDF). Bulletin of the New York State Museum. 105: 31.
  7. 1 2 3 4 5 Roody WC. (2003). Mushrooms of West Virginia and the Central Appalachians. Lexington, Kentucky: University Press of Kentucky. p. 463. ISBN   978-0-8131-9039-6.
  8. ↑ Kibby G. (1994). An Illustrated Guide to Mushrooms and Other Fungi of North America. Stamford, Connecticut: Lubrecht & Cramer Ltd. p. 178. ISBN   978-0-681-45384-5.
  9. 1 2 3 McKnight VB, McKnight KH (1987). A Field Guide to Mushrooms: North America. Peterson Field Guides. Boston, Massachusetts: Houghton Mifflin. p. 35. ISBN   978-0-395-91090-0.
  10. 1 2 3 Abdullah F, Rusea G (2009). "Documentation of inherited knowledge on wild edible fungi from Malaysia" (PDF). Blumea. 54 (1–3): 35–38. doi:10.3767/000651909X475996.
  11. 1 2 3 4 5 6 7 Miller HR, Miller OK (2006). North American Mushrooms: a Field Guide to Edible and Inedible Fungi. Guilford, Connecticut: Falcon Guide. p. 525. ISBN   978-0-7627-3109-1.
  12. 1 2 3 4 Seaver FJ. (1942). The North American Cup-Fungi (Operculates) (Supplemented ed.). Lancaster, Pennsylvania: The Lancaster Press. p. 196.
  13. 1 2 Phillips R. (2005). Mushrooms and Other Fungi of North America. Buffalo, New York: Firefly Books. p. 377. ISBN   978-1-55407-115-9.
  14. ↑ Li LT, Kimbrough JW (1996). "Spore ontogeny of Galiella rufa (Pezizales)". Canadian Journal of Botany. 74 (10): 1651–1656. doi:10.1139/b96-200.
  15. ↑ Cao J-Z, Fan L, Liu B (1992). "Notes on the genus Galiella in China". Mycologia. 84 (2): 261–263. doi:10.2307/3760260. JSTOR   3760260.
  16. ↑ Audubon (2023). Mushrooms of North America. Knopf. p. 47. ISBN   978-0-593-31998-7.
  17. ↑ Metzler V, Metzler S (1992). Texas Mushrooms: a Field Guide. Austin, Texas: University of Texas Press. p. 327. ISBN   978-0-292-75125-5.
  18. ↑ Smith AH, Weber NS (1980). The Mushroom Hunter's Field Guide. Ann Arbor, Michigan: University of Michigan Press. p. 32. ISBN   978-0-472-85610-7.
  19. ↑ Köpcke B, Weber RWS, Anke H (2002). "Galiellalactone and its biogenic precursors as chemotaxonomic markers of the Sarcosomataceae (Ascomycota)". Phytochemistry. 60 (7): 709–14. Bibcode:2002PChem..60..709K. doi:10.1016/S0031-9422(02)00193-0. PMID   12127588.
  20. ↑ Köpcke B, Johansson M, Sterner O, Anke H (2002). "Biologically active secondary metabolites from the ascomycete A111-95 - 1. Production, isolation and biological activities". Journal of Antibiotics. 55 (1): 36–40. doi: 10.7164/antibiotics.55.36 . ISSN   0021-8820. PMID   11918063.
  21. ↑ Hautzel R, Anke H (1990). "Screening of Basidiomycetes and Ascomycetes for plant-growth regulating substances – introduction of the gibberellic acid-induced de novo synthesis of hydrolytic enzymes in embryoless seeds of Triticum aestivum as test system". Zeitschrift für Naturforschung C. 45 (11–12): 1093–8. doi: 10.1515/znc-1990-11-1204 . S2CID   34998644.
  22. ↑ Weidler M, Rether J, Anka T, Erkel G (2000). "Inhibition of interleukin-6 signaling by galiellalactone". FEBS Letters. 48 (1): 1–6. doi: 10.1016/S0014-5793(00)02115-3 . PMID   4609797.
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