Suillus megaporinus
Mycologia 48(2): 302. 1956.
Common Name: none
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Pileus
Cap 2.0-7.0 cm broad, convex, plano-convex to plano-depressed in age; margin at first incurved, then decurved to uplifted, even to wavy, sometimes remaining partially attached to the stipe; surface subviscid when moist, appressed radially- fibrillose to squamulose; scales dull brown to vinaceous-brown over an ochraceous background; context up to 5.0 mm thick, rapidly tapering to the margin, buff-yellow, unchanging to slowly pinkish-vinaceous; odor aromatic, like that of Suillus pungens; taste mild.
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Hymenophore
Pores large, often compound, irregular in shape, radially arranged (boletinoid) to sublamellate, mouths dotted with brownish glands; pores at first yellowish-buff, becoming ochre-colored in age, not bluing; tube layer up to 1.5 cm thick, contorted, i.e. not vertically oriented, subdecurrent to decurrent to the stipe.
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Stipe
Stipe 1.0-2.0 cm long, 0.5-1.0 cm thick, central to eccentric, slender, short relative to cap size, narrowed towards the base, growing from a copious white mycelium; surface of apex pale dull-yellow from the descending pore layer, elsewhere whitish with brown glandular dots; partial veil fibrillose, whitish, tinged vinaceous, leaving remnants on the cap margin and stipe apex.
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Spores
Spores 7.0-10.0 x 3.5-4.0 µm, subfusoid in profile, elliptical in face-view, smooth, thin-walled, apiculus inconconspicuous, with one to several vacuoles; inamyloid; spore print not seen, "olivaceous" according to Snell and Dick.
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Habitat
Solitary to scattered under conifers, primarily Pinus contorta (lodgepole pine) along stream courses at higher elevations of the central and southern Sierra Nevada; fruiting after summer thunderstorms and in the early fall; locally common.
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Edibility
Unknown.
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Comments
Named for its unusually large pores, this Suillus is also distinctive for its gastroid appearance, i.e. pores that are labyrinthoid, not vertically arranged, as well as a short, poorly developed stipe. Suillus riparius is similar but differs in its larger size, non-gastroid pore layer, and tendency to fruit near rotting wood at lower elevations with Pinus lambertiana (sugar pine) and Pinus ponderosa (yellow pine). Also bearing a resemblance is Suillus umbonatus which shares a preference for fruiting with lodgepole pine and is also annulate, but can be distinguished by a viscid veil and non-gastroid tubes.
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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.
Desjardin, D.E., Wood, M.G. & Stevens, F.A. (2015). California Mushrooms: The Comprehensive Identification Guide. Timber Press: Portland, OR. 560 p.
Smith, A.H. & Thiers, H.D. (1964). A Contribution Toward A Monograph of North American Species of Suillus. Privately Published: Ann Arbor, MI. 116 p.
Snell, W.H. & Dick, E.A. (1956). Notes on Boletes. IX. Mycologia 48(2): 302-310. (Protologue)
Thiers, H.D. (1967). California boletes III. The genus Suillus. Madroño 19: 148-160.
Thiers, H.D. (1975). The status of the genus Suillus in the United States. Beih. Nova Hedw. 51: 247-278.
Thiers, H.D. (1975). California Mushrooms—A Field Guide to the Boletes. Hafner Press: New York, NY. 261 p. (WWW)
Thiers, H.D. (1979). The genus Suillus in the Western United States. Mycotaxon 9(1): 285-296.
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Other Descriptions and Photos
- Fred Stevens: Suillus megaporinus (CP) — closeup
- Fred Stevens: Suillus megaporinus (CP)
- Fred Stevens: Suillus megaporinus (CP)
- The Boletes of California: Suillus megaporinus (D & CP)
