Knudsen, K. 2011: A preliminary study of Pleopsidium stenosporum (Stizenb. ex Hasse) K. Knudsen. - Opuscula Philolichenum 9: 77-83. [RLL List # 223 / Rec.# 32898] Abstract: Lecanora stenospora is revised and transferred to Pleopsidium. It is known from California and Washington in western North America. The thallus morphology of the species is intermediate between P. discurrens from Tibet and P. flavum which also occurs in North America. It occurs on limestone, mafic greenstone, and probably other slightly calcareous metamorphic rocks. No collections were seen on granite, a common substrate of P. flavum.