1871 W. A. Leighton 175 Spores 8, colourless, ellipsoid, polari-bilocular.
1921 A. L. Smith 9 In the family, Physciaceæ, the cross wall of the septate spore is so thickened that the lumen of each cell is reduced to a small area at the ends; hence the term polari-bilocular.