Scientific name: Leucoagaricus americanus (Peck)
Vellinga
Derivation of name: americanus means "American" or
perhaps "New World."
Synonyms: Agaricus americanus Peck; Lepiota
americana (Peck) Sacc.; Leucocoprinus americanus
(Peck)
Redhead
Common name(s): Reddening Lepiota
Phylum: Basidiomycota
Order: Agaricales
Family: Agaricaceae
Occurrence on wood substrate: Saprobic;
several or
gregarious on stumps, sawdust, tree removal sites, wood
chips and lawns and meadows; July to October.
Dimensions: Caps 3-15 cm wide and stipes 7-14
cm long and 0.5-2.5 cm thick.
Cap: Dry; smooth at first but becoming scaly with reddish
to reddish-brown scales, center remaining smooth; whitish
between scales
but reddening with age and/or drying,
staining reddish with
handling.
Gills: Free; white, bruising yellow-orange; reddish to
reddish-brown with age.
Spore print:White.
Stipe: White, becoming reddish to reddish brown with age;
bruising yellowish when young, then slowly reddish;
bowling pin or spindle-shaped.
Veil: Present, sometimes movable, sometimes evanescent.
Edibility: Although edible, it is not recommended for
novices due to
similarities to poisonous Amanita species
and Chlorophyllum molybdites.
Comments: A combination of distinctive traits
characterize this mushroom: the unusual stalk shape, the
yellow to orange staining of fresh specimens, and
its
tendency to age or dry reddish overall.
More information at MushroomExpert.com:
Figure 1. Leucoagaricus americanus growing at the site
where a tree was removed. Photo © Gary Emberger.
Figure 2. These specimens of Leucoagaricus americanus
are growing on a stump, another typical habitat.
Photo © Gary Emberger.
Figure 3.
A closer view of the specimens in Figure 2.
Photo © Gary Emberger.
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Figure 4. The ring can fall off which can lead to
confusion when trying to identify this mushroom.
Photo © Gary Emberger.
Figure 5. This specimen shows the ring and the spindle-
shaped (or the shape of a stretched out bowling pin)
stalk. Photo © Gary Emberger.
Figure 6. The cap is scaly but the center usually remains
smooth. Photo © Gary Emberger.
Figure 7. When young, all parts of the mushroom bruise
yellowish to orange and then finally, reddish.
Photo © Gary Emberger.
Figure 8. Specimens of Leucoagaricus americanus collected
from an area of landscape mulch. Note the spindle-shaped
stalk, bruising, and the ring (veil) beginning to detach from the
stipe. Photo © Leanne Heckman.
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