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Tylopilus porphyrosporus (Fr. and Hök) A. H. Sm. and Thiers
Life   Fungi   Basidiomycota   Boletaceae   Tylopilus

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California Fungi—Porphyrellus porphyrosporus Porphyrellus porphyrosporus
(Photo: © Michael Wood)

Porphyrellus porphyrosporus (Fr. & Hök) E.-J. Gilbert
Les Livres du Mycologue Tome I-IV, Tom. III: Les Bolets: 99. 1931.

Common Name: none

Synonyms: Tylopilus pseudoscaber (Secretan) Smith & Thiers, Tylopilus porphyrosporus (Fr. & Hök) A.H. Sm. & Thiers

Basionym: Boletus porphyrosporus Fr. & Hök

  • Pileus

    Cap 7-12 cm broad, convex, expanding to plano-convex; margin decurved becoming nearly plane at maturity; surface dark-brown, dull, matted tomentose, in age blackish-brown, sometimes patchy-areolate; context 1.0-1.5 cm thick, soft, whitish, unchanging or slowly pinkish-tan to pale blue; odor and taste "fungal".

  • Hymenophore

    Pores 1-2 per mm when young, approximately 1 per mm at maturity, angular, at first dingy light-brown, medium-brown in age, sometimes bluing where bruised; tubes, up to 1.5 cm long, concolorous with the pores, depressed at the stipe.

  • Stipe

    Stipe 7-15 cm long, 1.5-3.0 cm thick, solid, equal to tapering to an enlarged base; surface fibrillose-striate, the fibrils blackish-brown over a pallid ground color, usually reticulate at the apex, darker where handled, sometimes pinkish where bruised, then blackish-brown; context fleshy, white, the upper portion when cut, slowly greyish, then blackish-grey, the base when cut turning pinkish-tan, then dark-grey; exterior of stipe base whitish, often well rooted in the substrate; partial veil absent.

  • Spores

    Spores 14.5-17.0 x 6.0-7.5 µm, smooth, thick-walled, ellipsoid to subfusoid, 1-3 guttulate, hilar appendage inconspicuous; spore print reddish-brown.

  • Habitat

    Solitary to scattered under conifers, especially Sitka spruce ( Picea sitchensis ); fairly common from Mendocino Co. north along the California coast; fruiting from late fall to mid-winter. Less common south of Mendocino, usually associated with pines.

  • Edibility

    Experience is limited, but it is probably edible.

  • Comments

    Porphyrellus porphyrosporus is one of California's more distinctive boletes with a dark-brown to almost blackish color. It is also the Tylopilus -like species most likely to be encountered, at least along California's north coast. Tylopilus indecisus is similar, but is lighter-colored and has a conspicuously reticulate stipe. An unusual aspect of Porphyrellus porphyrosporus is the color changes it exhibits when cut or bruised. These typically are slow to develop and usually involve an initial change from cream to pale pink, then greyish-black, or in some cases, at first pale blue, then greyish-black. This species often stains wax paper collecting bags blue.

    There is considerable question about the correct name for our California species. This may be a species complex. A multi-gene analysis of western specimens is currently being done to determine if we have one species or more than one. This will determine if any match the European Porphyrellus porphyrosporus . A possible name from Oregon for our species is Boletus olivaceobrunneus , which would need to be transfered to the genus Porphyrellus.

  • References

    Bessette, A.E., Roody, W.C. & Bessette, A.R. (2000). North American Boletes: A Color Guide to the Fleshy Pored Mushrooms. Syracuse University Press: Syracuse, NY. 400 p.
    Breitenbach, J. & Kränzlin, F. (1991). Fungi of Switzerland. Volume 3: Boletes and Agarics (1st Part). Strobilomycetaceae, Boletaceae, Paxillaceae, Gomphidiaceae, Hygrophoraceae, Tricholomataceae, Polyporaceae (lamellate). Verlag Mykologia: Luzern, Switzerland. 361 p.
    Desjardin, D.E., Wood, M.G. & Stevens, F.A. (2015). California Mushrooms: The Comprehensive Identification Guide. Timber Press: Portland, OR. 560 p.
    Hansen, L. & Knudsen, H. (1992). Nordic Macromycetes. Volume 2. Polyporales, Boletales, Agaricales, Russulales. Nordsvamp: Copenhagen, Denmark. 474 p.
    Knudsen, H. & Vesterholt, J. ed. (2008). Funga Nordica: Agaricoid, boletoid and cyphelloid genera. Nordsvamp: Copenhagen, Denmark. 965 p.
    Knudsen, H. & Vesterholt, J. ed. (2012). Funga Nordica: Agaricoid, boletoid, clavarioid, cyphelloid and gastroid genera. Vol. 1. Nordsvamp: Copenhagen, Denmark. 511 p.
    Smith, A.H. & Thiers, H.D. (1968). Notes on Boletes—I 1. the Generic Position of Boletus subglabripes and Boletus chromapes 2. a Comparison of Four Species of Tylopilus . Mycologia 60(4): 943-954.
    Smith, A.H. & Thiers, H.D. (1971). The Boletes of Michigan. University of Michigan Press: Ann Arbor, MI. 426 p.
    Thiers, H.D. (1975). California Mushrooms—A Field Guide to the Boletes. Hafner Press: New York, NY. 261 p.
    Watling, R. (1970). British Fungus Flora: Agarics and Boleti. Vol 1. Boletaceae, Gomphidiaceae, Paxillaceae. HMSO: Edinburgh, Scotland. 124 p.
    Watling, R. & Hills, A.E. (2005). British Fungus Flora: Agarics and Boleti. Vol 1. Boletes and their Allies. Royal Botanic Garden: Edinburgh. 173 p.
    Wolfe Jr., C.B. (1979). Austroletus and Tylopilus subgenus Porphyrellus , with Emphasis on North American Taxa. J. Cramer: Vaduz. 148 p.
    Zeller, S.M. (1935). Some Miscellaneous Fungi of the Pacific Northwest. Mycologia 27(5): 449-466.

  • Other Descriptions and Photos Main Photo

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

The Fungi of California
Copyright © 1999-2019 Michael Wood & Fred Stevens
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Following modified from Taiwan Biodiversity National Information Network
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Kingdom Fungi  
 Phylum Basidiomycota  
 Class Basidiomycetes  
 Order Boletales  
 Family Boletaceae  
 Genus Tylopilus  
  Tylopilus porphyrosporus    A.H. Smith & Thiers 
Provider: Chou, Wen-Neng 
hierarchy tree    download xml    download txt    Chinese Page    
Synonyms: Boletus porphyrosporus Krombholziella pseudoscaber Phaeoporus porphyrosporus Porphyrellus porphyrosporus Porphyrellus pseudoscaber   details
Citation: Chen, C.M. et al: 特有生物中心, 台灣野生菇菌(I) p.148, 1994
Name Code: 142007
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