Agaricus albolutescens

Agaricus albolutescens
A trio of Agaricus albolutescens
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Agaricaceae
Genus: Agaricus
Species:
A. albolutescens
Binomial name
Agaricus albolutescens
Zeller (1938)
Agaricus albolutescens
View the Mycomorphbox template that generates the following list
Gills on hymenium
Cap is convex or flat
Hymenium is free
Stipe has a ring
Spore print is brown
Ecology is saprotrophic
Edibility is edible

Agaricus albolutescens, commonly known as the amber-staining agaricus,[1] is a moderate-sized, stocky-statured mushroom with a pleasant odor; it bruises slowly but persistently yellow.[2]

Taxonomy

The holotype of Agaricus albolutescens was collected at Agate Beach, Oregon, by Gertrude S. Burlingham on November 21, 1937.[3]

Albolutescens is botanical Latin for yellowish white.

Description

Pileus

The cap is 6–12 centimetres (2+1⁄2–4+1⁄2 inches) broad, and convex; it becomes planoconvex to planodepressed. The margin is incurved, then decurved, overlapping the gills. Occasionally, it is wavy and appendiculate from veil fragments. The surface is dry and white; when bruised, it turns tawny-brown. The context varies from 1.5 to 2 cm (1⁄2 to 3⁄4 in) thick; it is firm and turns pale-peach when cut. When the flesh is dry, odor and taste is musty.[4]

Lamellae

The gills are free, close, and, at first, pallid, though they then turn a pale pinkish-tan. As it ages, A. albsolutescens is dark chocolate-brown in color. The lamellulae are in five to six series.[5]

Stipe

The stipe is 2–7 cm (1–3 in) long, 1.5–3 cm thick, and more or less equal except for a bulbous base. In addition, it has a narrow, cottony central core. The surface of the apex is palled and finely striate, while the lower stipe can vary from glabrous to sparsely covered with whitish fibrils, occasionally sheathed with cottony-floccose veil remnants. Like the cap, it yellows. The partial veil is layered. The surface underneath can be cottony or fibrillose. Sometimes, it fragments, leaving scattered cottony patches over a membranous-tomentose basement layer. The annulus is superior, thin, and initially erect, then pendulous.[6]

Spores

Spores are 6.0–7.5 x 4.0–5.0 μm, elliptical, and inequilateral in profile. In addition, they are smooth, moderately thick-walled, and have an inconspicuous hilar appendage. Their germ pore is absent.[7]

Similar species

The way it bruises distinguishes the species from other members of Agaricus, such as A. xanthodermus, a mildly toxic species which has a phenolic or medicinal odor and bruises fleetingly yellow. A. albolutescens tends to discolor tawny-brown, rather than simply yellow, and the gills are chocolate-brown and free.[8][7]

A. silvicola is very similar but has a less dramatic bruising reaction, more yellowish than tawny, a normal rather than stocky stature, and slightly smaller spores. A. albolutescens and A. silvicola represent a single polymorphic species or a species complex.[9][10]

References

  1. ^ Arora, David (1986). Mushrooms demystified: a comprehensive guide to the fleshy fungi (Second ed.). Berkeley: Ten Speed Press. ISBN 978-0-89815-169-5.
  2. ^ Haard, Richard; Karen Haard (1975). Poisonous & hallucinogenic mushrooms. p. 57. ISBN 9780889300057.
  3. ^ http://www.librifungorum.org/Image.asp?Nav=yes&FirstPage=214700&LastPage=215412&NextPage=215174]
  4. ^ Kerrigan, Richard W. (1986). The Agaricales (Gilled Fungi) of California. 6. Agaricaceae. Mad River Press: Eureka, California. p. 62
  5. ^ Arora, p. 315
  6. ^ Arora, p. 331
  7. ^ a b Wood, Michael; Fred Stevens (1998). "Agaricus albolutescens". Archived from the original on 2009-07-10. Retrieved 2009-07-07.
  8. ^ Arora, p. 336
  9. ^ Arora, p. 335
  10. ^ Zeller, S.M. (1938). New or Noteworthy Agarics from the Pacific Coast States. Mycologia 30: 468-474.

Sources

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