Polyporus tuberaster mushrooms | Mushroom types | Biobritte mushrooms
Polyporus tuberaster mushrooms
Synonyms: Polyporus decurrens Underwood; Polyporus mcmurphyi Murr.
Pileus
Fruiting body annual, cap 50 to 150 mm broad, round to semicircular in outline, convex, becoming plane, depressed to infundibuliform; margin incurved when young, sometimes upturned in age; surface buff, ochre, tawny to brown, covered with dark fibrils, and scales, the latter often with erect tips; context pallid, up to 10 mm thick, tough, hard when dry; odor and taste not determined.
Hymenophore
Pores white, cream, to pale tan, 2-3/mm, round, angular, to irregular in shape, edges entire to dentate; tube layer 1-3 mm in depth, concolorous with the pores.
Stipe
Stipe 30-70 x 15-30 (40) mm thick, solid, fleshy-tough, round, equal to enlarged at the base, cap attachment central, eccentric to occasionally lateral; surface concolorous with the cap or lighter, pores descending the apex a short distance, sometimes leaving reticulations; terrestrial fruitings attached to a belowground dark brown to blackish, irregularly shaped sclerotium.
Spores
Spores 10-16 x 4-6.5 microns, oblong-cylindrical, smooth, thin-walled, hyaline, inamyloid; spores white in deposit.
Habitat
Mostly solitary, terrestrial, occasional on downed wood of various hardwood trees such as oaks (Quercus spp.), willows (Salix spp.), and madrone (Arbutus menziesii), etc.; fruiting after fall rains along the coast; uncommon.
Edibility
EdibleYoung specimens edible if thoroughly cooked; sclerotium inedible.
Some comments
- Polyporus tuberaster is a ground-dwelling polypore (with some exceptions) that from a distance could be mistaken for a gilled mushroom.
- The cap is buff, tawny to brownish, covered with small dark scales, often with raised tips.
- A whitish, decurrent pore layer and central to eccentric stipe are also helpful field marks.
- Fruiting bodies of Polyporus tuberaster are unusual in that they develop from an underground blackish potato-like tuber called a sclerotium, thought to be a resting stage or storage structure.
Apocryphal stories aside, the blackish potato-like tubers are not edible, because of a tough texture and embedded dirt.
Polyporus tuberaster is occasionally found on downed wood. Whether a mycelial connection exists from these fruitings to a buried sclerotium is unknown.
Polyporus tuberaster can be confused with Polyporus squamosus, a similar but larger, strictly wood-dwelling species that have caps with coarser scales but these typically lack erect or tufted tips.
Additionally, sclerotium is not produced. Several members of the genus Albatrellus, another ground-dwelling polypore are also similar, but none have the combination of cap colors and scales of Polyporus tuberaster.
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