(Hust.) Aboal in Aboal, Alvarez-Cobelas, Cambra and Ector 2003
Psammothdium pennsylvanicum has a higher density of areola within a stria (35-40 in 10 μm).
Psammothidium subatomoides has a higher stria density.
Potapova 2012
(Hust.) Bukht. and Round 1996