Selaginella and Desfontainia, are what kind of item?
Selaginella Selaginella is the sole genus of primitive vascular plants in the family Selaginellaceae, the spikemosses or lesser clubmosses.
Rhodothamniella Rhodothamniella floridula is a small red seaweed detectable more easily with the feet than with the eyes. It thrives only where sand and rock occur together: anchored to the rock, it accumulates sand to form a slightly soft irregular carpet a centimetre or so in thickness. Although the surface is a dull red colour, in cross section the appearance is of a miniature sand dune with no visible algal component. Unable to stand significant desiccation, it prefers locations from the mid-shore downwards.