Basionym Name:Pyrenula cinerella var. quadriloculata Fink, Minn. bot. Stud. 2(2): 276 (1899)
Homotypic synonyms:Microthelia micula var. quadriloculata (Fink) Zahlbr., Cat. Lich. Univers. 1: 263 (1921)Pyrenula cinerella subsp. quadriloculata (Fink) Fink, Contr. U.S. natnl. Herb. 14(1): 239 (1910)