Thanks Daphne! Motivated by Troy's remarks to look just a bit more.
In Microlichens V2 Bruce puts it this way:
Graphis scripts is a widely used name that encompasses a large range of morphological variation. Unfortunately those morphologies do not coincide well with the genetic structure of the species (Kraichak et al. 2015).
The “script” seems to vary from place to place and substrate to substrate. Sometimes the lirellae form star-like clusters [e.g. https://www.flickr.com/photos/wanderflechten/27340525279/], in other cases they are long and sinuous (similar to g. pergracilis), and in other cases there is some distinct parallelism among the lirellae. No one has broken the code in the script.)
From the abstract of Kraichak et al. 2015:
Our analyses suggest between six and seven putative species within the G. scripta complex. However, these did not correspond to the taxa that were recently distinguished based on apothecium morphology and could not be circumscribed with the morphological characters that were traditionally used in the classification of the complex. Any formal taxonomic treatment will require additional sampling and evaluation of additional traits that potentially can characterize these clades.