 "Vermilainia robusta" is classified in the subgenus "Vermilacinia" in which it is easily recognized by its relatively small number basal tubular branches, generally 5–10 in number, often inflated and connected to a basal holdfast.Deflated forms can be difficult to distinguish from other related species, but generally recognized by the simple branches that are relatively broad to their short length, not more than 4 cm long, up to 6 mm in diameter.Lichen substances are typical of the subgenus