Disciotis venosa

Disciotis venosa, commonly known as the bleach cup, veiny cup fungus, or the cup morel is a species of fungus in the family Morchellaceae. Fruiting in April and May, they are often difficult to locate because of their nondescript brown color. Found in North America and Europe, they appear to favor banks and slopes and sheltered sites. Although D. venosa is considered edible, it may resemble several other species of brown cup fungi of unknown edibility.

Disciotis venosa
Scientific classification
Kingdom:
Fungi
Division:
Ascomycota
Class:
Pezizomycetes
Order:
Pezizales
Family:
Morchellaceae
Genus:
Disciotis
Species:
D. venosa
Binomial name
Disciotis venosa
(Pers.) Boud. (1893)
Synonyms[1]
  • Peziza venosa Pers. (1801)
  • Discina venosa (Pers.) Fr. (1822)
  • Discina venosa var. rabenhorstii Sacc. (1889)
  • Disciotis venosa f. radicans Perco (1994)

Taxonomy

The fungus was first described as Peziza venosa by Christian Hendrik Persoon in 1801, from collections made near Klagenfurt, Austria.[2] Jean Louis Émile Boudier transferred it to Disciotis in 1893.[3]

Bruno Perco described the form Disciotis venosa f. radicans from collections made in Italy.[4]

The specific epithet venosa, meaning "veined", refers to the veins on the inner cup surface. Common names for the species include bleach cup,[5] veiny cup fungus,[6] and cup morel.[7]

Description
Young, cup-shaped fruit bodies

Fruit bodies produced by this fungus are cup- or disc-shaped, up to 20 cm (8 in) wide. The interior surface of the cup, the hymenium, is dark brown. It tends to become folded into vein-like markings, hence the specific epithet venosa;[8] these markings, however, may be absent in young individuals.[9] The exterior surface is a whitish color, covered with pustules.[8] There is a short stipe that anchors the cup to the ground.[10] Although young fruiting bodies are cup-shaped, when they are 7 to 8 cm (2.8 to 3.1 in) in diameter, the apothecia split and flatten down to lie in the soil. They are very brittle. The fruit bodies have been estimated to have a lifespan of up to 12 weeks.[8] The flesh of the fungus has a bleach-like odor when it is broken.[10]

Microscopic characteristics

The spore are elliptical and smooth, with dimensions of 21–24 by 12–14 µm. The asci (spore-bearing cells), are 370–400 by 18–20 µm, while the paraphyses are stout and club-shaped, with tips that are up to 12 µm wide.[6]

Edibility

Disciotis venosa is edible, and choice,[6] although one author notes that only collectors who have the equipment to check its microscopic characters should consider consuming the species, as it may be confused with several other brown cup fungi.[11]

Similar species

Species that may resemble Disciotis venosa include the "thick cup", species Discina perlata (also edible), as well as several species of Peziza. Peziza species generally have thinner flesh than D. venosa, and will turn a dark blue color if a drop of iodine solution is placed on it.[7] Additionally, the tips of asci in Peziza species will stain blue with iodine, a feature that can be observed with a light microscope.[10] Another lookalike, Discina ancilis, has an inner cup surface that is folded, wrinkled, or sometimes smooth, rather than veined. The outer cup surface has small tufts of hairs arranged in clumps.[12]

Habitat and distribution

This fungus is typically found growing on the ground among mossy or needle-covered soil among conifers; they are often difficult to notice because their brown color typically blends into the background. They have been noted to prefer to grow on banks or slopes rather than flat areas.[8] This species is also referred to as a "snowbank mushroom" because fruit bodies typically appear around the edges of melting snowbanks.[13] In Europe, the fungus typically fruits from March to May.[10]

Disciotis venosa is found in North America[11] and Europe (including Bulgaria,[14] Sweden,[15] Spain,[16] and Wales[8]). It also occurs in Turkey, where it is considered critically endangered.[17]

References
  1. "Species synonymy: Disciotis venosa (Pers.) Arnould, Bull. Soc. mycol. Fr. 9: 111 (1893)". Species Fungorum. CAB International. Retrieved 2014-01-03.
  2. Persoon CH. (1801). Synopsis methodica fungorum (in Latin). Göttingen, Sweden. p. 638.
  3. "Rapport sur les excursions faites par la Société Mycologique de France pendant la session de 1893". Bulletin de la Société Mycologique de France (in French). 9 (2): 111. 1893.
  4. Perco B. (1994). "Contributo alla conoscenza del genere Disciotis. Primo ritrovamento della nuova forma Disciotis venosa (Pers.: Fr.) Boud. fo. radicans fo. nov". Rivista di Micologia (in Italian). 37 (1): 53–58.
  5. Roberts P, Evans S (2011). The Book of Fungi. Chicago, Illinois: University of Chicago Press. p. 562. ISBN 978-0-226-72117-0.
  6. Tylutki EE. (1979). Mushrooms of Idaho and the Pacific Northwest. Moscow, Idaho: University Press of Idaho. p. 35. ISBN 0-89301-062-6.
  7. McKnight VB, McKnight KH (1987). A Field Guide to Mushrooms, North America. Boston: Houghton Mifflin. p. 37. ISBN 0-395-91090-0.
  8. Brown RP. (1980). "Observations of Sarcoscypha coccinea and Disciotis venosa in North Wales during 1978–1979". Bulletin of the British Mycological Society. 14 (2): 130–135. doi:10.1016/S0007-1528(80)80008-3.
  9. Seaver FJ. (1917). "Photographs and descriptions of cup-fungi—V. Discina venosa". Mycologia. 9 (2): 53–54. doi:10.2307/3753343. JSTOR 3753343.
  10. Kibby G. (2000). "Fungal portraits. No. 4: Disciotis venosa". Field Mycology. 1 (3): 111–112. doi:10.1016/S1468-1641(10)60057-6.
  11. Weber NS, Smith AH (1980). The Mushroom Hunter's Field Guide. Ann Arbor, Michigan: University of Michigan Press. pp. 36–37. ISBN 0-472-85610-3.
  12. Beug MW, Bessette AE, Bessette AR (2014). Ascomycete Fungi of North America: A Mushroom Reference Guide. Austin, Texas: University of Texas Press. p. 141. ISBN 978-0-292-75452-2.
  13. Arora D. (1986). Mushrooms Demystified: A Comprehensive Guide to the Fleshy Fungi. Berkeley, California: Ten Speed Press. p. 46. ISBN 0-89815-169-4.
  14. Dimitrova E. (2011). "Disciotis venosa". Red Data Book of the Republic of Bulgaria. Volume 1. Plants and Fungi. Digital edition. Joint edition of the Bulgarian Academy of Sciences & Ministry of Environment and Water. Retrieved 2015-11-22.
  15. Ryman S. (1978). "Swedish Pezizales of spring and early summer". Svensk Botanisk Tidskrift. 72 (4): 327–340.
  16. Losantos AP, Carretero JC (1981). "Mycologic notes on Navarra Spain 1. New provincial and peninsular records". Anales del Jardin Botanico de Madrid (in Spanish). 38 (1): 19–24.
  17. Çinar H, Sermenli HB, Işiloğlu M (2014). "Some critically endangered species From Turkey" (PDF). Fungal Conservation (4): 26–28.
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