Hypocenomyce scalaris

Hypocenomyce scalaris, a lichen, on decorticated roots of an overturned tamarack (Larix laricina).

"Thallus green to green-brown, more greyish when dry, consisting of overlapping scales with ascending, sorediate tips; apothecia rare, black, discs pruinose. Widespread and locally common on acid-barked trees, fences and sheltered, siliceous rocks." (http://www.lichens.lastdragon.org/Hypocenomyce_scalaris.html)