1. Buxbaum JC (1728) Plantarum minus cognitarum. Centuria II. Complectens plantas circa Byzantium et in oriente observatas. Petropoli
2. Buxbaum JC (1732) Observationes circa quasdam plantas Ingricas. Comment Acad Sc Petropolit III, pp 270–273
3. Chen J, Blume HP, Beyer L (2000) Weathering of rocks induced by lichen colonization—a review. Catena 39:121–146
4. Elenkin AA (1922) On the new species of jelly lichen Leptogium Issatschenkoi mihi in Central Botanical Garden and new section Pseudomallotium mihi in this genus. Bot Mater Inst Cryptog Plants Central Bot Garden RSFSR 1(5):65–69 (in Russian)
5. Georgi JG (1790) Versuch einer Beschreibung der russisch kaiserlichen Residenzstadt St. Petersburg und der Merkwurdigkeiten der Gegend. St. Petersburg