 Basal branches are loosely united and frequently divided dichotomously into similar branches, the ultimate branchlets have tiny isidia-like branchlets, or true isidia, that distinguishes the species from others in the subgenus.The thallus of "Vermilacinia acicularis" has a cortex up to thick.Lichen substances are primarily of the following three terpenes that are characteristic of the subgenus "Vermilacinia"