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

Alpova diplophloeus (Zeller & C.W. Dodge) Trappe & A.H. Sm.
red gravel

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

Introduction to the Macrofungi

© Michael Beug  Email the photographer   (Photo ID #17992)

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Distribution of Alpova diplophloeus
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Alpova diplophloeus group

Species Information

distinguished by nearly spherical to ovoid fruitbody, with cinnamon-colored surface when mature, deep reddish orange or deep reddish brown bruising reaction, spore mass that is reddish brown at maturity and consists of small gel-filled chambers and pallid veins, and underground growth with preference for alder; there are distinctive microscopic characters as well, including spores that are amyloid when young and inamyloid when mature, 6-spored to 8-spored basidia, and a distinctive peridial layer with clamp connections, dermatocystidia present and often conspicuous; abundant along Pacific Coast from CA to AK, also known from moist habitats in Rocky Mountains, MI, NT, NF, (Smith(4)), collections examined from BC, WA, OR, NF, NWT, AK, CA, CO, MI, UT, WY, (Trappe(11)), abundant in the Pacific Northwest, found from BC south to northern CA and east to the east coast, also in Europe, (Trappe(13)), frequent on foray lists for BC and collections from BC at Pacific Forestry Centre and University of British Columbia
Outer Surface:
0.6-3(4.5)cm across, typically almost spherical to ovoid; light yellowish pink when young, darkening to reddish brown or brown when old, "where bruised soon changing to deep reddish orange or deep reddish brown"; "rhizomorphs absent to sparse, fine, appre
no columella, (Smith(30))
Chemical Reactions:
FeSO4 on sections of dried material dark green on both spore mass and peridium; "KOH giving a reddish pigment diffusing from the peridium into the mounting medium but the peridium itself soon rusty brown in sections", (Smith(30))
sticky-gelatinous; "chamber contents pale yellow to olive when young, soon discoloring to reddish brown or orange brown when exposed, near maturity brownish orange to reddish brown", (Smith(4)), "composed of small chambers separated by pale yellow or whit
fruity at maturity (Trappe(11), Smith(4)), usually fruity at maturity (Arora)
spores 4-5.5(6) x (1.8)2.2-2.8 microns, elliptic to oblong, (Smith(4)), spores 4.5-5.5 x 2.3-2.8 microns, elliptic, oblong, or in some cases allantoid in one view, or with slightly lateral protrusion causing the spore to be slightly angular, colorless in KOH singly but in masses pinkish buff, amyloid when young but inamyloid (yellow brown) when mature, basal scar inconspicuous; basidia 6-spored to 8-spored, 10-16 x 4-5 microns; tramal plates of interwoven colorless nongelatinous hyphae 2-6 microns wide; peridium a trichodermium of hyphae with rusty-fulvous walls mostly thickened somewhat, the cells in the layer up to 25 microns wide and about isodiametric to elongated, the layer appearing cellular as a result, at the outer surface the hyphal ends more or less projecting or the tips crooked and coiled around each other, septate, the cells many odd shapes and smooth-walled; clamp connections present on colored hyphae of peridium; all tissues inamyloid, (Smith(30)), spores elongate, smooth, thin-walled, colorless to pale brownish, (Trudell), spores 4-6 x 1.5-3 microns (Arora)

Habitat / Range

under alder; June through December, (Smith(4)), widely scattered to gregarious in humus or soil (usually buried) under or near alder, (Arora), mycorrhizal with Alnus (Trappe(13))

Synonyms and Alternate Names

Alpova cinnamomeus C.W. Dodge
Rhizopogon diplophloeus Zeller & C.W. Dodge
Rhizopogon parvisporus Bowerman

Taxonomic and Nomenclatural Links

Additional Range and Status Information Links

Additional Photo Sources

Related Databases

Species References

Smith(30) (as Rhizopogon diplophloeus), Trappe(11), Trappe(13), Smith(4), Trudell(4)*, Arora(1)*, Trappe, M.(1)*, Trappe, M.(3)*

References for the fungi

General References