The relationship of this taxon to other taxa within the division is unknown (incertae sedis), and it has not yet been placed with certainty into any class, order, or family.

These fungi are notable for their unique reproductive structures, which resemble tiny hands or palms when viewed under a microscope.

While Psammina fungi have been found mainly in Europe, with sightings in countries such as the United Kingdom, the Netherlands, and France, at least one species has been reported in Brazil, suggesting a potentially wider distribution.

However, a closer examination of the type species, P. lobariae, revealed conidiogenesis details similar to those of Psammina bommeriae.

This led Peter Michael Earland-Bennett and David L. Hawksworth (2005) to propose that Pycnopsammina should be treated as a synonym of Psammina.

This mycelium consists of brown, branching threads (hyphae) that are slightly swollen at intervals, giving them a beaded appearance.

They resemble tiny hands or palms, with multiple arm-like projections radiating outward from a central point.

[6] When gently flattened under a microscope, a mature Psammina conidium can span from about 50 to over 160 μm in diameter, depending on the species.

The conidiogenous cells in some species are monoblastic (producing a single conidium), integrated (formed from the same hyphae as the vegetative parts), terminal, and often brown and smooth-walled.

They are often found growing on crusts of green algae and lichens that occur on the dry sides of trees and stones.

This suggests that certain Psammina species may play a role in shaping the microbial communities on tree bark and rock surfaces.