Graphis plumierae
Graphis plumierae is a species of script lichen in the family Graphidaceae. It was described as new to science in 1915 by Finnish mycologist Edvard Vainio. The type was collected in Gourbeyre, Guadeloupe. In 2016, G. plumierae was reported from an oak forest in the Sintra Mountains, Portugal, which was also a new occurrence for Europe. It has also been documented from the Miranda region of Pantanal, Brazil.
Description
Graphis plumierae has labia that are white-pruinose. The lirellae, 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 is only laterally, not completely encircling the structure. The hymenium 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 dividing them into segments. They measure between 26.5 and 43.3 micrometres in length and between 6.4 and 7.9 μm in width. The length-to-width ratio of these spores falls between 4.1 and 6.1 times as long as wide.