Does have annual interruptions.
If this is an incorrect ID, please holler! I have been using an online dichotomous key for the clubmosses and relatives, and we seem to have enough around this area to be a little confusing! Also, the photo is sideways. ;)
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.