[2] It is characterized by its unique beaked pycnidia (asexual fruiting bodies) that are predominantly developed along the margins of living leaves.

He collected the type specimen in a montane forest in the Owen Stanley Range (Northern Province) at an altitude between 2,100 and 2,400 m (6,900 and 7,900 ft).

[2] This lichen species typically grows along the margins and scars of living leaves, forming irregularly shaped patches that are whitish to pale bluish in colour.

[2] A key distinguishing feature of Byssoloma spinulosum is the presence of beaked pycnidia, which are predominantly developed along the margins of leaves.

However, the position of the pycnidia along the leaf margins, as well as differences in apothecial size and the color of the hypothecium, set it apart from closely related species such as Byssoloma humboldtianum.