It grows on highly calcareous substrates such as chalk, limestone and shell sand, often in association with the moss species Trichostomum crispulum.

As the lichen ages, the central area often develops a verrucose-bullate texture—characterised by wart-like protrusions—and becomes coarsely dusted with a pale, powdery substance known as pruina.

Initially concave with a thalline exciple (a rim-like structure surrounding the apothecia), they become convex over time, with the margin appearing more or less excluded.

A potassium hydroxide (K) test turns the thallus purple, indicating the presence of the secondary metabolites (lichen products) parietin and its precursor, emodin.

Under ultraviolet light, the thallus shows a dull, pale orange colour due to the presence of fragilin and caloploicin.

It is frequently found in warm and sheltered locations that are still open to the elements, favouring sites that are close to sea level.

Gyalolechia fulgens belongs to a group of specialised lichens that thrive in highly open environments that typically feature areas of exposed soil and often include small rock outcrops.

These settings are characterised by minimal competition from larger, vascular plants, allowing these lichens the space and resources they need to grow.

[6] Gyalolechia fulgens is a prominent component of the biological soil crust lichen community of the Negev desert, and is particularly common on north-west facing slopes and interdunes.