Agaricus diminutivus

Agaricus diminutivus
Scientific classification Edit this classification
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Agaricaceae
Genus: Agaricus
Species:
A. diminutivus
Binomial name
Agaricus diminutivus
Peck
Agaricus diminutivus
View the Mycomorphbox template that generates the following list
Gills on hymenium
Cap is ovate or flat
Hymenium is free
Stipe has a ring or is bare
Spore print is brown
Edibility is not recommended

Agaricus diminutivus, commonly known as the diminutive agaricus,[1] is a species of mushroom in the genus Agaricus. It is unique among its genus due to its small size,[1][2] and was first described in 1873.[3]

Description

The cap of Agaricus diminutivus is about 1-3 centimeters in diameter. It starts out round or ovoid, becoming convex or flat. It is pale, often being whitish or tannish.[2] The stipe is 2-6 centimeters long and 3-10 millimeters wide, with a ring around it that sometimes disappears.[1] The gills are free, and start out a pale pinkish tan color becoming pink and finally brown. The mushroom's flesh both bruises slightly yellow and turns yellow when potassium hydroxide (KOH) is applied.[2] The spore print is brown.[1]

While likely edible, this mushroom is not recommended as food because it can be confused with poisonous Inocybe species.[1][4] It is also very small and not very common.[2][3]

Agaricus diminutivus is actually a species complex, consisting of multiple closely related species that are difficult to distinguish from one another.[1][2]

Habitat and ecology

Agaricus diminutivus grows in forests, especially under conifers. It fruits during autumn.[2]

References

  1. ^ a b c d e f Arora, David (January 1, 1986). Mushrooms Demystified: A Comprehensive Guide to the Fleshy Fungi (2nd ed.). Berkeley, CA: Ten Speed Press. pp. 340–341. ISBN 9780898151695.
  2. ^ a b c d e f Siegel, Noah; Schwartz, Christian (September 1, 2024). Mushrooms of Cascadia: A Comprehensive Guide to Fungi of the Pacific Northwest. Humboldt County, California: Backcountry Press. p. 78. ISBN 9781941624197.
  3. ^ a b Stevens, Michael Wood & Fred. "California Fungi: Agaricus diminutivus". www.mykoweb.com. Retrieved 2025-07-15.
  4. ^ "E-Flora BC Atlas Page". linnet.geog.ubc.ca. Archived from the original on 2025-02-11. Retrieved 2025-07-15.
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