Photo 1: mass of coralloid protonema bearing shoots with dwarf leaves and antheridia; photo 2: protonema and antheridia; photo 3: habitat, seasonally dry pond bed; photo 4: dark olive-green protonema mat on drying mud, with Riccia sorocarpa; photos 5 and 6: rhizoidal tubers on the protonema.
Either sanguineus or velutinus