Parmotrema bangii (Vainio) Hale, 1974
Parmotrema bangii is characterized by the sorediose pustules and the granular soredia originated from the cortex disintegration, together with the presence of stictic acid (medulla K+ yellow, P+ slowly orange). Parmotrema perlatum is a similar sorediate species, also with stictic acid, but in this species the soralia are linear and marginal, never forming pustules. Parmotrema madylinae Fletcher has pustules, but instead of stictic acid, it has protocetraric acid (medulla K–) and shorter ascospores, 23–25 × 14–15 μm, episporium 2 μm (Hale 1986).
Unfortunately, we were unable to find pycnidia in our specimen. However, it must be noted that Krog & Swinscow (1981) reported the conidia as being bacillar to filiform, 8–10 mm long, so different from that described by Vainio (1909).
[Spielmann & Marcelli 2008]