The lichen was first
formally described as a species new to science in 1863 by Finnish botanist
William Nylander, as a member of the genus
Graphis. The
type specimen was collected in
Nova Granada (Brazil), at an altitude of . Nylander noted some similarity with
Graphis homographiza, and also compared it to
Graphis dividens (now
Phaeographis dividens). In 2002,
Bettina Staiger proposed a transfer to genus
Thalloloma, based on a reorganisation of family Graphidaceae that stressed the importance of
ascocarps and their accessory organs as characteristics to delimit genera. A year later, Minoru Nakanishi and Hiroyuki Kashiwadani suggested that the
taxon should instead be in genus
Platythecium. ==References==