Summary:
Features of Ganoderma tsugae include 1) a fairly large, fan-shaped to semicircular, reddish brown to mahogany or nearly black cap with a surface that has a varnished appearance, 2) a stem that may be absent or lateral and often vertical, the surface similar to the cap, 3) soft, spongy, light-weight flesh, that is cream to pale buff, often with thin black lines just below the cap surface, 4) round to angular pores, 5-6 per mm, the pore surface cream, 5) pale purplish brown tubes, 6) growth on conifers, and 7) microscopic characters including spores 11-12.5 x 6.5-8.5 microns. Note the discrepancy in spore sizes - those of Ginns(28) were taken from Adaskaveg and Gilbertson''s 1986 detailed study of G. tsugae. A. and O. Ceska reported a collection that in a fresh state had a bluish green cap (Mushroom Observer 333487). A blue Ganoderma was also reported on Facebook, apparently from Cortez Island in British Columbia by Kari Chase McNabb.

Microscopic:
spores 11.0-12.5 x 6.5-8.5 microns, ovoid with a truncated apex; generative hyphae 3-5 microns wide with clamp connections, skeletal hyphae 3.0-8.5 microns wide, walls colorless, binding hyphae 2-4 microns wide, dendritic, walls colorless, (Ginns), spores 13-15 x 7.5-8.5 microns, elliptic with truncate apex, pale brown in KOH, inamyloid, "wall two layered with interwall pillars between the layers, outer wall with pronounced depressions and appearing rough"; basidia 4-spored, 23-28 x 11-14 microns, "broadly clavate to pyriform", with a basal clamp connection; cystidia "and other sterile hymenial elements" absent; context generative hyphae 3-5 microns wide, thin-walled, colorless, with clamp connections, rarely branched, context skeletal hyphae 3-8.5 microns wide, thick-walled, colorless, without clamp connections, with rare branching, context binding hyphae 2-4 microns wide, thick-walled, colorless, much branched, branches often tapering; tramal hyphae similar, (Gilbertson)

Spore Deposit:
rusty brown (Gilbertson)

Notes:
Ganoderma tsugae is known from BC (Ginns(28)), NS, ON, QC, AZ, CA, GA, IN, LA, MA, ME, MI, MN, NC, NH, NJ, NY, OH, PA, TN, TX, VA, VT, WI, and WV (Gilbertson). There are online records at the Consortium of Pacific Northwest Herbaria from Washington, Oregon, Idaho, and Alaska but without enough information to know if Ganoderma oregonense was being represented by the collector as a synonym of Ganoderma tsugae - additional herbarium notes on some of these collections are not online.