It was a very nice surprise, finding a previously observed Graphis form with very characteristic lirellae, that I remember from 6-7 years ago, when I made the field work that gave rise to my paper annoucing seven new Graphis species existent in Europe (reference below).
It was found very close to the place of the observation of Graphis elegans just uploaded, a place where I'm used to find Graphis specimens, but never this one. It clearly resend me to another Graphis sepcies previously observed, G. handelii, and reported at the time as new to Europe (and thus to Portugal). The question is that both species share the same chemistry (norstictic acid) and, thus, can be confused in the field, though the form of lirellae are completely different (in this respect, the following link should be seen:https://www.fungi.org.uk/viewtopic.php?t=2854).

Reference:
Zacarias Lepista and André Aptroot: Seven species of Graphis from Portugal reported new to Europe, The Lichenologist 48(4): 259–267 (2016).

See also: https://mushroomobserver.org/271997