Crinkled Snow lichen (Flavocetraria nivalis) is a medium sized bushy lichenized fungi with flat, lobes with crinkled edges. It is a pale yellow/ivory in color which in larger batches can look a bit like patches of show, which lends itself to its name. Traditionally, this lichen is used in tea to treat various illnesses but is not edible to humans. Caribou on the other hand eat it readily as part of their winter diet where the snow has been stripped thin by the blowing wind allowing easy access to this plant with a few scuffs of the hoof.
Snow Lichen is part of the Parmeliaceae family, with almost all members having a symbiotic relationship with a green algae. The Snow lichen is a fruticose lichen which means they differ from most other species because they attach to the ground only at the base of the lichen. If the color of the thallus is lighter it is usually associated with lower light levels on the lichen. With Snow covering this wonderful plant for 8 months of the year it's no wonder that this plant is an ivory white that sometimes can have a green tinge to it.
The Inuit name for Crinkled Snow Lichen is Nirnait (ᓂᕐᓇᐃᑦ) it was traditionally used in teas to cure ailments, but I am struggling to find information on which ailment. It was used by healers as a cure for eye infections. Which was made by boiling the lichen until the water turned black, then allowing it to cool and drinking the liquid.