And I have seen a number of different mosses while out hiking that could be peeled off the dead tree in a sort of thick mat, so if it was laid in the sun to dry it could very easily act like a brick of peat - just a bit fluffier.
I read about this plant yesterday in an article about the world’s oldest living things. I also would like to know what the heck is underneath that mass of tiny leaves. I saw one picture of a man standing on top of one, so it must be pretty thick under there.
It should probably be noted that, regardless of how it LOOKS externally, yareta is not a moss. It’s an angiosperm, a flowering plant, and is actually in the same family as carrots, fennel and Queen Anne’s Lace.