Peziza violacea

Peziza violacea, commonly known as the violet fairy cup or the violet cup fungus,[1] is a species of fungus in the genus Peziza of the family Pezizaceae. As both it common names and specific epithet suggest, the cup-shaped fruiting bodies are violet colored on the interior surface. P. violacea is typically found growing on burnt soil.

Peziza violacea
Scientific classification
Kingdom:
Fungi
Division:
Ascomycota
Class:
Pezizomycetes
Order:
Pezizales
Family:
Pezizaceae
Genus:
Peziza
Species:
P. violacea
Binomial name
Peziza violacea
Pers. (1794)

Description

Fruiting bodies are initially almost spherical, then cup-shaped, then expanding to being somewhat flattened in age. They do not have a stem (or at most a short, narrowed version), and may be up to 3 centimetres (1.2 in) wide by 1–1.5 cm tall, although they are often much smaller.[2] The inner spore-bearing surface of the cup, the hymenium, is pale violet to reddish violet in color, often centrally depressed and slightly wrinkled. The flesh is thin (0.5–2.0 mm thick)[3] and pale purple. The exterior surface is paler than the interior, somewhat grayish, and may be pruinose near the margins—having a very fine whitish powder on the surface. The odor and taste are not distinctive.

Microscopic characteristics

The spores are elliptical, smooth, hyaline, without any oil droplets (eguttulate), with dimensions of 16–17 × 8–10 µm.[2] The asci are roughly cylindrical, 8-spored 200–250 × 12–15 µm.[4] The paraphyses are club-shaped, filled with violet granules, and have curved tips; they are up to 8 µm wide.[4]

Edibility

Like many others in the genus Pezizales, the edibility is unknown for this small and insubstantial species.[3]

Habitat and distribution

Peziza violacea is widespread on burned soil and charred wood.[2] It typically grows scattered or in groups. It is found in North America and Europe,[4] and Iceland.[5]

Similar species

The closely related Peziza praetervisa is also violet-colored and prefers growing on burned ground. In general, Peziza praetervisa is more purple- rather than violet-colored like P. violacea. However, fruiting body color can vary depending on humidity and other factors, so they are more reliably distinguished microscopically—P. praetervisa has rough, not smooth spores with two polar oil drops. P. proteana also prefers burned ground, but is paler in color, being white or pinkish.[1]

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gollark: Of course, the index will be destroyed when I move this off my development computer onto the TRUE server.
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gollark: user interface™

See also

References
  1. Arora D. (1986). Mushrooms Demystified: a Comprehensive Guide to the Fleshy Fungi. Berkeley, Calif: Ten Speed Press. pp. 824. ISBN 0-89815-169-4.
  2. Tylutki EE. (1979). Mushrooms of Idaho and the Pacific Northwest. Moscow: University Press of Idaho. p. 96. ISBN 0-89301-062-6.
  3. "California Fungi: Peziza violacea". Retrieved 2009-02-13.
  4. Seaver FJ. (1917). Photographs and descriptions of cup-fungi: V. Peziza proteana and Peziza violacea". Mycologia 9(1): 1–3.
  5. Pfister DH, Eyjolfsdottir GG. (2007). "New records of cup-fungi from Iceland with comments on some previously species". Nordic Journal of Botany 25(1–2): 104–112.
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