Growing in the entrance area of a partially collapsed lava tube
This appears to be a Lycopodium or clubmoss, growing among other mosses and lichens on a sunny boulder at about 6000' on the slope of Mt. Townsend. The lanky stems were pointed down.
Lycopodiopsida is a class of plants often loosely grouped as the fern allies. Traditionally the group included not only the clubmosses and firmosses, but also the spikemosses (Selaginella and relatives) and the quillworts (Isoetes and relatives). However, the latter are now usually separated off into a separate class, Isoetopsida.