E-Flora BC: Electronic Atlas of the Flora of British Columbia

Rhizopogon vinicolor A.H. Sm.
no common name

Species account author: Ian Gibson.
Extracted from Matchmaker: Mushrooms of the Pacific Northwest.

Introduction to the Macrofungi

© Michael Beug  Email the photographer   (Photo ID #18007)

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Distribution of Rhizopogon vinicolor
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Species Information

features include spherical to angular fruitbody with appressed-fibrillose surface that barring injury is white then yellow for a short time then vinaceous-red, but surface normally soon staining pink from injury, spore mass that is white to dingy ochraceous becoming olive to dark olive-brown and has small chambers, growth under Douglas-fir, and chemical and microscopic characters including smooth truncate spores from 4-spored and 6-spored basidia, and peridium that is dull vinaceous as revived in KOH; a molecular study of R. vinicolor, R. ochraceisporus, R. diabolicus, R. vesiculosus, and R. parvulus concluded the first three names were synonyms [falling under the name R. vinicolor], that R. parvulus was close if not identical, and that a closely related but distinct biological species designated R. vesiculosus sensu Kretzer et al included R. vesiculosus A.H. Sm. from Idaho, a paratype of R. diabolicus from Idaho, 3 paratype collections of R. vinicolor from Idaho, and a R. vinicolor collection from Oregon, (R. vesiculosus sensu Kretzer et al. differed from R. vesiculosus A.H. Sm. in having a wider range of spores lengths - (5)6-9(10) vs. 6-6.5 microns, and in being found under Douglas-fir rather than Lodgepole Pine, see SIMILAR for the differences between R. vinicolor sensu Kretzer et al. and R. vesiculosus sensu Kretzer et al.); R. vinicolor type found in ID (Smith(30)), reported to North American Truffling Society for BC and frequently for OR, reported by Luoma(1) and Fogel(8) for OR, very abundant in the Pacific Northwest, predominantly in spring, (Kretzer(1)), 2 paratypes of R. diabolicus A.H. Sm. from WA were subsumed under R. vinicolor sensu Kretzer et al., documenting the presence of R. vinicolor in Washington; found through much of the range of Douglas-fir in North America and introduced to Europe, Australia, and New Zealand on Douglas-fir seedlings on plantations, (Trappe, M.(1)), abundant in the Pacific Northwest, found from southwestern BC to northern CA, CO, (Trappe(13) who maintain separately Rhizopogon ochraceisporus A.H. Sm. as common in Washington, Oregon, and Idaho, under Pseudotsuga, and Rhizopogon diabolicus A.H. Sm. as rare in central Idaho under Pinaceae)
Outer Surface:
1-3cm across, "white then vinaceous-red"; dry, appressed fibrillose, (Smith(4)), 1-3cm across, spherical to nearly spherical, ovoid, or angular from external pressures; "white at first and soon staining pink, finally becoming vinaceous-red over all, if ba
Chemical Reactions:
KOH on surface gives purplish stain fading to vinaceous; FeSO4 on surface slightly olive-brown or no reaction, (Smith(30))
becoming dark olive-brown, (Smith(4)), chambers small and nearly filled with spores; white to dingy ochraceous becoming olive to dark olive-brown, (Smith(30)), light yellow when young, "by maturity dark cinnamon brown to dark olive and rubbery", (Trappe,
none (Smith(30)), slightly fruity (Trappe, M.(3))
mild (Trappe, M.(3))
spores (5.5)6-7(8) x 3-4(4.5) microns, 2 basal projections [truncate], subhymenium cellular; "peridium with a thin layer of interwoven fibrils", "interior hyphae reddish in KOH, in the epicutis the hyphal walls cinnamon-buff in KOH", (Smith(4)), spores (5.5)6.5-8.5(9) x 3-4(4.5) microns in English description, (5.5)6-7(8) x 3-4(4.5) microns in Latin description, elliptic to oval with truncate base, under oil immersion a slight tooth projects on each side of the scar to produce an incipient cup-like base, smooth, yellowish in Melzer's reagent and KOH, wall somewhat thickened; basidia 4-spored and 6-spored, 5-8 microns wide, clavate, readily collapsing; paraphyses 15-30 x 6-12 microns, clavate to elliptic or subcylindric, becoming thick-walled when old, lacking distinctive content; tramal plates when mature of hyphae 3-6 microns wide, colorless, interwoven, refractive-gelatinous; subhymenium cellular; peridium of appressed-interwoven hyphae 3-8(12) microns wide, the cells mostly equal in width but some enlarged, no pockets of sphaerocysts present, as revived in KOH the whole layer dull vinaceous, "pigment in masses between the hyphae (obscuring almost all detail in the layer)"; clamp connections absent; all tissues inamyloid, (Smith(30))

Habitat / Range

under conifers, especially Pseudotsuga (Douglas-fir), (Smith(4)), in groups or single in duff under Pseudotsuga, July and August, (Smith(30)), mycorrhizal host in the Pacific Northwest Pseudotsuga, (Trappe(13)), fruiting year-round (Trappe, M.(3))

Synonyms and Alternate Names

Rhizopogon diabolicus A.H. Sm.
Rhizopogon ochraceisporus A.H. Sm.

Taxonomic and Nomenclatural Links

Additional Range and Status Information Links

Additional Photo Sources

Related Databases

Species References

Smith(30), Smith(4), Kretzer(1), Luoma(1), Fogel(8), NATS(1) (Trappe, M., accessed April 6, 2005), Trappe, M.(1)*, Trappe, M.(3)*, Trappe(13)

References for the fungi

General References