The apothecia are stalked and black, but of a lighter colour than the mass of spores forming the nucleus. |
This species has small tan to yellowish apothecia with greenish yellow thalline margins. |
The blue-gray, pruinose apothecia and green leprose thallus are good diagnostic features of this lichen. |
The latter species has lecanorine apothecia with black hymenial disks. |
The position of the apothecia constitutes another distinction. |
Tuck., with much stronger, darker thallus and apothecia on the whole larger. |