Tonics are defined in the dictionary as agents that restore or increase body tone, and which have invigorating, refreshing, or restorative influences. Cap is hard, brittle, and deeply cracked. Chaga growing on yellow birch. Cap is pale brown with darker brown streaks and an inrolled margin. Pore surface is white and smooth when young, becoming brownish with age.
Spore print is white.
Birch polypore growing on decaying white birch trunk. Older speciman of birch polypore. Top of cap is hard, thick, and crusty, gray to grayish black or brown. Pore surface is white, staining brown. Brown spore color.