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Pluteus petasatus (Fries) Gillet
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Pluteus petasatus
© Copyright Malcolm Storey 2011-2118 · 3
Pluteus petasatus

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Pluteus petasatus
© Copyright Malcolm Storey 2011-2118 · 3
Pluteus petasatus
Pluteus petasatus
© Copyright Malcolm Storey 2011-2118 · 3
Pluteus petasatus

Pluteus petasatus
© Copyright Malcolm Storey 2011-2118 · 3
Pluteus petasatus
Pluteus petasatus
© Copyright Malcolm Storey 2011-2118 · 3
Pluteus petasatus

Pluteus petasatus
© Copyright Malcolm Storey 2011-2118 · 3
Pluteus petasatus
Pluteus petasatus
© Copyright Malcolm Storey 2011-2118 · 3
Pluteus petasatus

Pluteus petasatus
© Copyright Malcolm Storey 2011-2118 · 3
Pluteus petasatus
Pluteus petasatus
© Copyright Malcolm Storey 2011-2118 · 3
Pluteus petasatus

Pluteus petasatus
© Copyright Malcolm Storey 2011-2118 · 3
Pluteus petasatus
Pluteus petasatus
© Copyright Malcolm Storey 2011-2118 · 3
Pluteus petasatus

Pluteus petasatus
© Copyright Malcolm Storey 2011-2118 · 3
Pluteus petasatus
Pluteus petasatus
© Copyright Malcolm Storey 2011-2118 · 3
Pluteus petasatus

Pluteus petasatus
© Copyright Malcolm Storey 2011-2118 · 3
Pluteus petasatus
Pluteus petasatus
© Copyright Malcolm Storey 2011-2118 · 3
Pluteus petasatus

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FamilyScientific name @ source (records)
Fagaceae  Quercus sp @ BPI (1)
_  Substrate @ BPI (1)

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California Fungi—Pluteus petasatus Pluteus petasatus
(Photo: © Fred Stevens)

Pluteus petasatus (Fries) Gillet
Hyménomycètes de France: 142. 1838.

Common Name: none

  • Pileus

    Cap 5-13.5 cm broad, convex to convex-umbonate, expanding to nearly plane, at maturity the disc sometimes depressed or raised; margin in youth, incurved, then decurved, finally plane; surface sticky when moist, otherwise dry, glabrous when young, often shiny, cream-colored with pale innate, brown fibrils concentrated at the disc, the latter occasionally becoming fibrillose to squamulose; in dry weather the cap sometimes squamulose overall; context white, unchanging, soft, up 1.5 cm thick, thin near margin; odor and taste of radish.

  • Lamellae

    Gills free, crowded, broad, pallid, becoming cream to pinkish, finally salmon pink; not marginate; lamellulae up to four-seried.

  • Stipe

    Stipe 5-9 cm long, 1-1.5 cm thick, straight, the apex and base often enlarged, fleshy, solid at maturity; surface longitudinally striate at the apex, white, elsewhere smooth to slightly wrinkled, in age brownish fibrils sometimes developing at the base; partial veil absent.

  • Spores

    Spores 5.5-7 x 4-5 µm, broadly ellipsoid to ovoid, smooth, with granular contents; spore print salmon-pink.

  • Habitat

    Clustered, less commonly solitary, on rotting chips, woody debris or logs; fruiting in late summer in watered areas or after the fall rains.

  • Edibility

    Edible Edible.

  • Comments

    This infrequent Pluteus is unusual in its clustered fruiting habit. Also characteristic is a relatively smooth, sometimes shiny cap that is pallid at the margin and brownish at the disc. A related, more common species is Pluteus cervinus . It is distinguished by an entirely brown cap. Volvariella speciosa is a distant cousin similar in stature, cap, and spore color, which may also fruit in wood chips. It is easily told from Pluteus petasatus by the presence of a volva. Another look-alike occasionally found in wood chips is Agaricus californicus . It has a similar colored, though not nearly as shiny cap, and can be differentiated by a partial veil and at maturity, free chocolate-colored gills.

  • References

    Arora, D. (1986). Mushrooms Demystified. Ten Speed Press: Berkeley, CA. 959 p.
    Banerjee, P. & Sundberg, W.J. (1995). The Genus Pluteus Section Pluteus (Pluteaceae, Agaricales) in the Midwestern United States. Mycotaxon 53: 189-246.
    Bas, C., Kyper, T.W., Noordeloos, M.E. & Vellinga, E.C. (1990). Flora Agaricina Neerlandica -- Critical monographs on the families of agarics and boleti occuring in the Netherlands. Volume 2. Pluteaceae, Tricholomataceae. A. A. Balkema: Rotterdam, Netherlands. 137 p.
    Breitenbach, J. & Kränzlin, F. (1995). Fungi of Switzerland. Volume 4: Agarics (2nd Part). Entolomataceae, Pluteaceae, Amanitaceae, Agaricaceae, Coprinaceae, Strophariaceae. Verlag Mykologia: Luzern, Switzerland. 368 p.
    Desjardin, D.E., Wood, M.G. & Stevens, F.A. (2015). California Mushrooms: The Comprehensive Identification Guide. Timber Press: Portland, OR. 560 p.
    Orton, P.D. (1986). British Fungus Flora: Agarics and Boleti. Vol 4. Pluteaceae: Pluteus & Volvariella . Royal Botanic Garden: Edinburgh, Scotland. 99 p.
    Siegel, N. & Schwarz, C. (2016). Mushrooms of the Redwood Coast. Ten Speed Press: Berkeley, CA. 601 p.
    Singer, R. (1956). Contributions Towards a Monograph of the Genus Pluteus . Trans. Br. Mycol. Soc. 39(2): 145-232.

  • Other Descriptions and Photos Main Photo
    • Arora (1986): p. 255 (D & P)
    • Bas et al. (1990): P. 37 (D & I)
    • Bessette et al. : p. 62 (D & CP)
    • Orton: p. 24 (D), fig. 46 (I)
    • Phillips: p. 138 (CP), p. 139 (D)

    (D=Description; I=Illustration; P=Photo; CP=Color Photo)

The Fungi of California
Copyright © 1999-2020 Michael Wood & Fred Stevens
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