The upper
thallus surface of
Parmotrema erectociliatum is whitish gray to ivory and can have a shiny or dull appearance, with some irregular cracking. The upper surface is covered in
soredia, which are powdery structures that contain fungal spores. The
soralia (structures that produce the soredia), are located at the margins of the and can be linear or crescent-shaped. The lobes are broad, small to moderate-sized, 2–7 mm wide, and rotund in shape. The edges of the lobes are defined by a conspicuous black rim and have long, stout, and slender that are black, mostly straight, and typically 0.5–1 mm long. The lower surface of the lichen has a narrow, blackened area that is 0.5–1 mm wide, with short, stout, and black
rhizines.
Apothecia and , which are reproductive structures, were not observed in this species. The contains
atranorin, while the medulla has
salazinic acid. The expected results of standard chemical
spot tests in the cortex are P+ (yellow),K+ (yellow), KC−, C−, UV−; and in the medulla P+ (deep yellow), K+ (yellow soon turning dark red), KC−, C−, UV−. ==See also==