Parmotrema clavuliferum (Räsänen) Streimann, 1986
Diagnostic description:
Parmotrema clavuliferum is distinguished by the sorediate lacinules, white variegated lower margin under the soralia, filiform conidia 7.5-12.5 μm long and the presence of salazinic (K+ yellow → blood red). In P. reticulatum the soralia are laminal to submarginal (Moon et al. 2001) and the conidia 12-16 μm (Hale & Fletcher 1990). Parmotrema pseudoreticulatum (Tavares) Hale has a nude and brown lower margin, 2–4 μm wide (Tavares 1945), while P. commensuratum produces norlobaridone and loxodin (K–, KC+ rose → reddish) and P. simulans only caperatic acid (negative reactions).
[Spielmann & Marcelli 2009]