Rhodora 45: 435 (1943).

Type locality: USA, Massachusetts, Plymouth Co., Wareham, 1924, C. A. Robbins in Sandstede: Cladon. Exs. 1391 (US - holotype; FH, H, TUR-V, UPS - isotypes).

Chemistry: Pseudonorrangiformic acid (Huneck & Yoshimura 1996: 153).