Agaricus deardorffensis

Agaricus deardorffensis

Pileus
Cap 7-19 cm broad, cylindrical to convex, expanding to nearly plane in age; surface dry, ground color pallid to white, covered with fine, appressed greyish-brown scales, concentrated at the disc; flesh white, thick, slowly becoming vinaceous when injured; odor strongly of phenol; yellowing in KOH.

Lamellae
Gills free, close, at first whitish, then pink, finally blackish-brown.

Stipe
Stipe 8-15 cm long, 2-3.5 cm thick, equal to slightly enlarged at base; surface white, smooth above and below the ring; veil membranous, thick, white, upper and lower surface smooth, forming a medially positioned, persistent ring; stipe base typically yellowing when bruised and smelling of phenol.

Spores
Spores 4-6.0 x 3.5-4.5 µm, smooth, elliptical; spore print blackish-brown.
Agaricus deardorffensis  Agaricus deardorffensis,Fall,Geotagged,United States

Appearance

Pileus
Cap 7-19 cm broad, cylindrical to convex, expanding to nearly plane in age; surface dry, ground color pallid to white, covered with fine, appressed greyish-brown scales, concentrated at the disc; flesh white, thick, slowly becoming vinaceous when injured; odor strongly of phenol; yellowing in KOH.

Lamellae
Gills free, close, at first whitish, then pink, finally blackish-brown.

Stipe
Stipe 8-15 cm long, 2-3.5 cm thick, equal to slightly enlarged at base; surface white, smooth above and below the ring; veil membranous, thick, white, upper and lower surface smooth, forming a medially positioned, persistent ring; stipe base typically yellowing when bruised and smelling of phenol.

Spores
Spores 4-6.0 x 3.5-4.5 µm, smooth, elliptical; spore print blackish-brown.
Agaricus deardorffensis  Agaricus deardorffensis,Fall,Geotagged,United States

Naming

Agaricus placomyces
Agaricus meleagris
Agaricus praeclaresquamosus

Habitat

Solitary, in small groups, or cespitose clusters on disturbed ground under conifers; fruiting from early to mid-winter.

References:

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http://www.mykoweb.com/CAF/species/Agaricus_deardorffensis.html
Taxonomy
KingdomFungi
DivisionBasidiomycota
ClassAgaricomycetes
OrderAgaricales
FamilyAgaricaceae
GenusAgaricus
SpeciesAgaricus deardorffensis