Synonyms: Hypochnus canadensis; Hypochnus ferruginosus; Kneiffiella bombycina (heterotypic); Kneiffiella bombycina var. calcarea; Kneiffiella bombycina var. slovaca; Kneiffiella fibrosa (homotypic); Knieffiella bombycina; Tomentella bombycina (heterotypic); Tomentella ferruginosa; Tomentella fibrosa (homotypic); Tomentellina bombycina (heterotypic); Tomentellina bombycina f. saxicola; Tomentellina ferruginosa; Tomentellina ferruginosa f. saxicola; Tomentellina fibrosa (homotypic); Zygodesmus fibrosus (homotypic)