Graphis plumierae has labia that are white-
pruinose. The lirellae (these are
ascomata with a long, narrow resembling dark squiggly lines), which are immersed in the substrate, have a lateral
thalline margin. The lichen contains the
secondary compounds norstictic acid,
stictic, and
salazinic acid. It
grows on bark. The reproductive structures, called , appear as thin, elongated
lineola-morph structures resembling script marks. These lirellae have smooth surfaces without striations. Their (outer protective layer) is (blackened) only laterally, not completely encircling the structure. The
hymenium (spore-producing layer) has an appearance due to tiny droplets that create a cloudy look under microscopic examination. The lirellae are sometimes branched, and their discs remain closed. The ascospores are colourless, typical of the genus. The of
G. plumierae have 7–10 cross-walls (
septa) dividing them into segments. They measure between 26.5 and 43.3
micrometres (μm) in length (with an average range of 32.5–39.9 μm) and between 6.4 and 7.9 μm in width (with an average range of 6.9–7.8 μm). The length-to-width ratio of these spores falls between 4.1 and 6.1 times as long as wide (averaging 4.3–5.6). ==See also==