Phytologia 28, 4: 339 (1974).

Basionym: Parmelia proboscidea var. xanthina Müll. Arg., Flora, Regensburg 67: 616 (1884).

Chemistry: Protolichesterinic acid only, protolichesterinic acid + unkn. KC+ subst. (Sipman & Wolf 1998: 21). (-)-2-Methylene-3(R)-carboxy-18(R)-hydroxynonadecanoic acid (Huneck & Yoshimura 1996: 148).