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

Polyporus tuberaster Jacq.
Canadian tuckahoe
Polyporaceae

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

Introduction to the Macrofungi

© Michael Beug  Email the photographer   (Photo ID #53105)

E-Flora BC Static Map
Distribution of Polyporus tuberaster
Click here to view the full interactive map and legend
Details about map content are available here
Click on the map dots to view record details.

Species Information

Summary:
yellowish brown cap with darker scales, white to pale tan decurrent pores, central to lateral stem with black base, arising from rubbery to rock hard blackish sclerotium that incorporates debris and dirt; sold in European markets, and if well watered will produce fruiting bodies for eating (Lincoff); according to Paul Kroeger (pers. comm.) the sclerotium has been mistaken for old pemmican; Gilbertson(1) show specimens on a map from CA and AZ, but give distribution as "Western United States south to Arizona in the aspen zone and Southern Canada, widespread in the northern boreal zone", in Canada this fungus occurs in the aspen parkland belt of the prairies, (Schalkwijk-Barendsen who illustrates it from AB, and mentions its occurrence in Netherlands, Italy, and Switzerland), known from BC in at least 3 locations, and from AB, SK, WA, OR, CA, and AZ, in western North America, (according to J. Ginns, pers. comm.), Asia (Breitenbach)
Cap:
up to 15cm across, 0.5-1.5cm thick, simple when on wood, often more compound when on the ground, circular to semicircular or even fan-shaped in compound fruitbodies, depressed in center, fleshy when fresh; whitish, ochraceous to pale yellowish brown; "covered with small tan to dark brown scales with a broad base and especially towards margin, split and fibrillose, in pale specimens the scales are pale and thus not especially distinct", when old becoming more bald from center as scales partly wear away, partly are glued to surface; margin thin and mostly finely ciliate [fringed with fine hairs] or torn, (Gilbertson), 4-15cm, convex to flat with depressed or umbilicate center, "margin often indented or lobed"; tan to brown or ocher, darker when old; dry, developing darker brown fibrils or fibrillose scales often radially arranged, (Arora)
Flesh:
up to 1cm thick, "fleshy-tough when fresh, drying rigid and brittle"; white, (Gilbertson), thin, rigid when dry; pallid, (Arora)
Pores:
1-2mm long and 0.5-1mm wide, decurrent, "often lacerate to dentate, angular, often somewhat radially elongated"; white to pale tan; tube layer up to 0.5cm thick, colored as pores, (Gilbertson), 1-3 per mm, usually decurrent; white to pale tan; tube layer 0.1-0.3cm thick, (Arora)
Stem:
0.5-6cm x 0.5-1.5cm, central to lateral, straight or curved at base; white to ochraceous except "at base with white hairs under which there is a thin black cuticle which may extend a short distance above the tomentum"; sclerotium "normally present in the ground, round to oval or irregular, heavy, up to 30 lbs, but normally far less than that, fleshy and tough when fresh, shrinking considerably on drying and becoming hard and brittle, surface ochraceous to dark dirty brown, densely mixed with sand, stones and roots, often in considerable quantities so it looks like ground material has been penetrated by mycelial strands and white spots of hyphae", (Gilbertson), 2.5-10(20)cm x 1-2.5(4)cm, "more or less equal, central or off-center", solid, tough; brown or cap-colored; arising from a large brown to black underground sclerotium that is rubbery when fresh but rock hard when dry, exterior of sclerotium "rough and irregular", "interior often marbled with blackish-brown and paler areas and usually full of dirt and debris", (Arora), sclerotium gristly and rubbery, with a black and gray pattern, (Schalkwijk-Barendsen)
Odor:
anise (Schalkwijk-Barendsen), resembling cheese (Lincoff), fungoid (Breitenbach)
Taste:
resembling cheese (Lincoff), mild (Breitenbach)
Microscopic:
spores 10-16 x 4-7 microns, cylindric to oblong elliptic, inamyloid, colorless; basidia 4-spored, 25-40 x 6-10 microns, clavate, with basal clamp; cystidia absent; hyphae dimitic, generative hyphae 3-9 microns wide, with clamp connections; hairs at base of stem and the scales mostly of wide generative hyphae; "binding hyphae of the Bovista type with tapering sidebranches, thick-walled to solid, sparingly branched, up to 12 microns in the main stem"; "sclerotium mainly with binding hyphae, in parts very finely branched and very thin, in most parts sparingly branched, thick-walled and variable in diameter, 3-10 microns wide, in some cases with apical swellings", (Gilbertson), spores 10-16 x 3.5-6 microns, cylindric, smooth, (Arora)
Spore Deposit:
white (Arora)

Habitat / Range

annual, on hardwoods or on the ground from a large blackish sclerotium (even on wood, there is often a connection through wood to underground sclerotium), causing a white rot of hardwoods, (Gilbertson), spring, late summer, fall, (Bacon)

Taxonomic and Nomenclatural Links

Additional Range and Status Information Links

Edibility

edible, "but tough unless young, fresh and thoroughly cooked", sclerotium inedible because full of dirt, (Arora)

Additional Photo Sources

Related Databases

Species References

Gilbertson(1), Arora(1)*, Lincoff(1)*, Schalkwijk-Barendsen(1)*, Breitenbach(2)*, Bacon(1)*, Buczacki(1)*

References for the fungi

General References