Details about map content are available here Click on the map dots to view record details.
Species Information
Summary: Features include a straw to dark brown circular fruitbody with a ciliate margin, large radially elongated hexagonal pores that are cream to buff, central stem, and growth on hardwoods. The radially aligned, hexagonal, relatively large pores, centrally depressed cap, central stem, and thin, tough fruitbodies distinguish Polyporus brumalis (see SIMILAR) and this species from other polypores, (Ginns). The online Species Fungorum, accessed September 3, 2018, gives the current name as Lentinus arcularius (Batsch) Zmitr., International Journal of Medicinal Mushrooms (Redding) 12(1): 88 (2010). MycoBank, accessed the same day, gives that name as a synonym of Polyporus arcularius Batsch: Fr.
Polyporus arcularius has been found in BC, WA, OR, ID, MB, ON, AL, AZ, CO, CT, DE, FL, GA, IA, IL, IN, KS, KY, LA, MD, MI, MN, MO, MS, MT, NC, NE, NJ, NM, NY, OH, OK, PA, SC, SD, TN, TX, VA, WI, and WV, and it occurs circumglobally, (Gilbertson).
Cap: up to 2.5cm across and 0.3cm thick, circular; straw-colored to dark brown, not zoned; bald, smooth to rugose [wrinkled]; margin acute, sterile underneath, ciliate [fringed with fine hairs], (Gilbertson), 1-8cm, round, convex becoming depressed or umbilicate; golden brown to dark brown; dry, usually minutely scaly; margin often ciliate, (Arora), sometimes rather indented laterally (Breitenbach)
Flesh: less than 0.1cm thick, tough; whitish to buff, not zoned, (Gilbertson), thin, tough; white, (Arora)
Pores: 1-2 per mm, hexagonal, radially aligned, with thin walls that become torn; cream to buff; dull, rough; tube layer up to 0.2cm, colored as flesh and continuous with it, (Gilbertson), 1-2 per mm, angular or hexagonal, sometimes decurrent; white or yellowish; tubes shallow, (Arora)
Stem: up to 3.5cm x 0.4cm, central, colored as cap; bald, (Gilbertson), 2-6cm x 0.2-0.4cm, "usually central or slightly off-center, more or less equal"; dark brown to yellowish brown; "smooth or minutely scaly, the base sometimes hairy", (Arora)
Microscopic: spores 7-9 x 2.5-3 microns, cylindric, straight or slightly curved, smooth, inamyloid, colorless; basidia 4-spored, 25-35 x 5-6 microns, clavate, with basal clamp; cystidia none; hyphal system dimitic, generative hyphae in context 2.5-5 microns wide, colorless in KOH, "thin-walled, often branched, with abundant clamps", skeletal hyphae in context 2-11 microns wide, thick-walled, nonseptate, with occasional branching; hyphae of cap surface 1-1.5 microns wide, thin-walled, with clamp connections; hyphae of trama similar, (Gilbertson), spores 7-11 x 2-3 microns, cylindric, smooth, (Arora)
Spore Deposit: white (Arora)
Habitat / Range
annual, single on dead hardwood, also on juniper and Douglas-fir decking, associated with a white rot of dead hardwoods, rarely on conifer wood, (Gilbertson), single or in small groups on dead hardwoods (Arora), on "dead branches and sticks in woodland or on the ground growing from buried wood", (Lincoff(1)), fruiting in summer and fall (Miller)
Similar Species
Neofavolus alveolaris usually differs in being laterally stemmed or with stem that is not well formed, and in having larger spores, (Gilbertson). N. alveolaris also has radially elongated pores but the stem is typically lateral or not well formed, the cap is a reddish yellow to pale brick red, and the spores are 11-14 microns long, (Ginns). Polyporus brumalis "also has more or less radially elongated, diamond-shaped pores, but they are much smaller than those of P. arcularius" as well as less radially elongated, and cap is darker, (Gilbertson). P. brumalis has a much darker cap, smaller and less radially elongated pores (angular but less strikingly hexagonal), and smaller spores, (Ginns).
.jpg)