[3][4] This monotypic genus the contains the corticolous (bark-dwelling), squamulose lichen species Knightiellastrum eucalypti, found in Tasmania, Australia.

It was first identified from specimens collected in Tasmania, Australia, where it was found on the moist trunks of old Eucalyptus obliqua trees in mixed forests.

The original classification of Icmadophila eucalypti within this genus was based on its morphological, anatomical, ecological, and chemical features, although, as explained by Kantvilas, this placement was provisional due to unsuccessful attempts to confirm its taxonomy through DNA analysis.

The separation was strongly supported by Bayesian inference, showing Knightiellastrum eucalypti as sister to a large clade containing traditional Icmadophila species and other related genera.

This restructuring reflects significant phylogenetic distinctions warranting a new genus, confirming earlier provisional assignments based solely on non-molecular characteristics.

This designation reflects that the thallus morphology of the type species vaguely echoes that of a smaller, infertile Knightiella splachnirima.

These squamules are densely packed with crystals that shine under polarised light and dissolve in a solution of potassium hydroxide (KOH).

The upper surface of the squamules is matt, smooth, or minutely rough, featuring a pseudocortex made up of randomly oriented, short hyphae measuring 3–5 μm wide, interspersed with occasional dead algal cells.

The lichen most commonly grows on Eucalyptus obliqua, a species prevalent in many of Tasmania's wet eucalypt forest ecosystems.