Agaricus arorae
| Agaricus arorae | |
|---|---|
| |
| A pair of Agaricus arorae | |
Scientific classification 
| |
| Kingdom: | Fungi |
| Division: | Basidiomycota |
| Class: | Agaricomycetes |
| Order: | Agaricales |
| Family: | Agaricaceae |
| Genus: | Agaricus |
| Species: | A. arorae
|
| Binomial name | |
| Agaricus arorae Kerrigan
| |
| Agaricus arorae | |
|---|---|
| Mycological characteristics | |
 | Gills on hymenium |
 | Cap is convex or flat |
 | Hymenium is free |
 | Stipe has a ring |
 | Spore print is brown |
 | Ecology is saprotrophic |
 | Edibility is unknown |
Agaricus arorae is a moderate-sized, forest-dwelling mushroom that exhibits certain color changes and is distinguished by its scales and stipe.
Taxonomy
[edit]Agaricus arorae was named after American mycologist and author David Arora.
Arora surmised that it was an intermediate taxon between red-staining and yellow-staining sections of Agaricus.[1]
Description
[edit]The cap is 3–7 centimetres (1+1⁄4–2+3⁄4 in) wide and convex before becoming flattening. It is white to reddish, with brownish fibrils or scales in the center and sometimes elsewhere.[1] The surface yellows with potassium hydroxide (KOH) and the flesh slowly bruises a reddish colour.[1] With a dry surface, the cap's disc can be glabrous or tomentose. The cap has an indistinct odor with a mild taste. The context can be as large as 5 mm thick, soft, and bruises irregularly a vinaceous colour where cut.[2]
The gills are free and close. They are pinkish at first then become dark brown.[1] The spores are 4–5.5 x 3–4 μm, elliptical, and smooth.[1] They are inequilateral in profile and moderately thick-walled, lacking a germ pore.
The stipe is 5–14 cm long and 0.5–2 cm thick.[1] At the base, it is slightly enlarged and becomes stuffed at maturity. The white veil is rather membranous and yields a thin ring. When cut, the cortex discolours to pinkish-orange. The stipe base changes brown to rusty-brown from handling. The margin is sometimes light brown. The apex surface is white and patchy fibrillose over a dull-buff ground color.[1]
Identification
[edit]Agaricus arorae resembles A. amicosus, A. bisporus, A. fuscofibrillosus, and A. spissicaulis.[1] It can be distinguished from some species by its conspicuous stipe and scales, if present.[3]
Distribution and habitat
[edit]Agaricus arorae was first described from Santa Cruz County, California, and since has been found in San Mateo and Alameda counties.[4][5]
See also
[edit]References
[edit]- ^ a b c d e f g h Arora, David (1986) [1979]. Mushrooms Demystified: A Comprehensive Guide to the Fleshy Fungi (2nd ed.). Berkeley, CA: Ten Speed Press. pp. 325–26. ISBN 978-0-89815-170-1.
- ^ Wood, Michael; Fred Stevens (1998). "Bovista aestivalis". Retrieved 2009-07-07.
- ^ Kerrigan, Richard W. (1986). The Agaricales (Gilled Fungi) of California. 6. Agaricaceae. Mad River Press: Eureka, CA. 62 p.
- ^ Kerrigan R (1985). "Studies in Agaricus III: New Species from California". Mycotaxon. 22: 419–434.
- ^ Studies in Agaricus III. New species from California. Mycotaxon 12: 419-434.