Summary:
Features include 1) flat growth on wood (or may be bent back to form shelving caps that are cinnamon brown and tomentose in narrow often slightly grooved zones), 2) a pore surface that is a shade of brown with round to maze-like pores, 3) flesh that is often duplex: white becoming cinnamon toward substrate or cap, or with a thin black line next to substrate or cap base, 4) relatively large cylindric spores, and 5) other microscopic characters. The online Species Fungorum, accessed November 16, 2020, listed the current name as Neoantrodia variiformis, but MycoBank, accessed the same day, listed the current name as Antrodia variiformis. The description is derived from Gilbertson(1).
Antrodia variiformis has been found in BC, WA, OR, ID, AB, ON, PQ, NB, NF, NS, YT, AK, CO, ME, MI, MN, MT, NH, NY, TN, UT, VT, and WY, and is found circumglobally in boreal forests (Europe, Asia), as well as being introduced in pine plantations in East Africa, (Gilbertson).
Cap:
growing flat to effused-reflexed [with part shelving into a cap], individual caps rarely more than 1cm wide, mostly as elongated narrow caps along the upper part of pore surface, separable, tough and flexible when fresh, harder when dry; upper cap surface cinnamon brown, more grayish when old; upper cap surface finely tomentose in narrow, often slightly sulcate (grooved) zones, when old becoming bald with some scattered tufts of agglutinated hyphae
Flesh:
"often duplex, the lower part white gradually becoming cinnamon towards the substrate or the pileus, old and well developed fruitbodies then often have a thin black zone next to the substrate or at the base of the pileus"
Pores:
"round to angular in horizontal parts of fruiting body, 1-2 per mm, more commonly irregular, sinuous to daedaleoid, especially on sloping substrates and 1-2 mm wide with sinuous walls, dissepiments whitish to cream with a wood-colored trama", "wood-colored when fresh and actively growing, with age and drying becoming pale cinnamon to isabelline or tobacco brown"
Microscopic:
spores 8-12 x 3-4.5 microns, cylindric, "often slightly arcuate close to the apiculus", inamyloid, colorless; basidia 25-35 x 6-8 microns, clavate; cystidia none, but colorless "slightly ventricose cystidioles may occur scattered among the basidia, 28-42 x 4-6.5 microns"; hyphal system dimitic or trimitic, generative hyphae with clamp connections, in context 2-5 microns and mostly slightly thick-walled, in trama and subhymenium 2-4 microns, thin-walled, and frequently branched, skeletal hyphae 2-6 microns, thick-walled to solid, straight, occasionally dichotomously branched, there may also be a third type of hyphae at the base of the context more frequently branched and more narrow, "which may be interpreted as binding hyphae or as the ends of more arboriform skeletal hyphae"
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