Parmotrema eciliatum (Nyl.) Hale, 1974
Parmotrema eciliatum is distinguished by the ciliate lobes, presence of stictic acid (medulla K+ yellow, P+ orange), apothecia imperforate, and the absence of vegetative propagules.
Parmotrema aldabrense (C.W. Dodge) Hale, reported to Africa, sometimes presents stictic acid as an accessory substance to the norstictic acid (Medulla K+ yellow → red), his main substance. However, it has perforate apothecia, maculae distinct, ascospores 13–18 × 5–7 μm (Hale 1965) and filiform conidia, 12–15 μm long (Swinscow & Krog 1988). Parmotrema preperforatum (W.L. Culb.) Hale, known in the United States, also has norstictic acid and stictic acid, together with perforate apothecia (Culberson 1973), but this is the only information we were able to find about this species, so that we don’t know more differences between P. aldabrense and P. preperforatum, except that one is recorded to Africa and the other to North America. Finally, P. blanchetianum (Müll. Arg.) Kalb, has similar morphology, but produces protocetraric acid instead stictic acid.
In the course of the present work we noted that P. eciliatum could also be distinguished by the cilia, usually furcated or irregularly branched.
[Spielmann & Marcelli 2009]