In the United States, it has been recorded on the bark-dwelling lichens Megalaria pulverea and Pertusaria carneopallida, while in France, it was found growing on Caloplaca cerina.

The lichen was found growing on the trunk of a red alder (Alnus rubra), specifically on Pertusaria carneopallida and accompanied by Phlyctis speirea.

[2] Sclerococcum toensbergii forms superficial, slightly convex structures known as sporodochia, which are blackish and can be rounded, elongated, or irregular in shape.

These sporodochia range from 100 to 300 μm in diameter and can sometimes merge together, often becoming poorly defined as mature conidia (asexual spores) spread around the conidiogenous (spore-producing) area.

The vegetative hyphae of this fungus are pale to medium brown and are embedded within the host lichen's thallus, measuring 2 to 5 μm in diameter.

This host grows at the base of Sorbus aucuparia (rowan) trees in areas characterized by Nardus grassland and dwarf shrub heathss with Vaccinium myrtillus (bilberry) and Calluna vulgaris (heather).

Similarly, in its Washington habitats, such as Mount St. Helens and the Olympic Peninsula, the annual precipitation is even higher, reaching 2500 mm.