Catathelasma evanescens

Catathelasma evanescens is a species of fungus in the family Tricholomataceae, and the type species of the genus Catathelasma. The species was described by Ruth Ellen Harrison Lovejoy in 1910.[1]

Catathelasma evanescens
Scientific classification
Kingdom:
Fungi
Division:
Basidiomycota
Class:
Agaricomycetes
Order:
Agaricales
Family:
Tricholomataceae
Genus:
Catathelasma
Species:
C. evanescens
Binomial name
Catathelasma evanescens
Lovejoy
Catathelasma evanescens
float
Mycological characteristics
gills on hymenium
cap is convex
hymenium is decurrent
stipe has a ring and volva
spore print is white
ecology is mycorrhizal
edibility: unknown

Description and Distribution

The genus includes the commoner C. imperiale and C. ventricosum, but the type species, C. evanescens, seems extremely rare. In 1914 it was only known from the location of the initial find, which is at an altitude of 3500 m. in the Medicine Bow Mountains of Wyoming.[2] It is distinguished from the other species because the gills are fairly distant ("subdistant") and because it has a large persistent volva around the base of the stipe.[3]

The species name may refer to the evanescent ring.

The following summary is taken from Mrs. Lovejoy's original description.[1]

  • Cap: 13 cm, broadly convex, white (but cream in the center).
  • Gills: White, very decurrent, "subdistant", with short and long ones mixed.
  • Stem: White, thick (4 cm.) but very short (1 cm.), with bulbous base, delicate evanescent ring, and large white persistent volva.
  • Spores: smooth, white, elliptical to fusiform, 14 - 17.5 × 3 - 5 µm.

References
  1. Lovejoy RH. (1910). "Some New saprophytic fungi of the middle Rocky Mountain region". Botanical Gazette, Crawfordsville. 50 (3): 383–85. The text can be found in the Internet Archive.
  2. The species is mentioned under Armillaria in William Murrill (1914). "Family 7. Agaricaceae". North American Flora. 10 (1): 37–38. The entry is on-line in the Biodiversity Heritage Library.
  3. Kuo, M. (2006, October). Catathelasma. See the MushroomExpert.Com Web site: http://www.mushroomexpert.com/catathelasma.html.


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