Physcia tenella (Scop.) DC var. tenella
Physcia tenella subsp. marina (A. Nyl.) D Hawksw. pp.
Very similar to Physcia adscendens but differing by the lobe edges which are not hood-like folded, with lip-shaped (labriform) cream soredia and sometimes less numerous marginal cilia. Apothecia are more frquent (but still rare), 1-2 mm diam., disc blackish, brown-blackish, pruinose. Common on nutrient-rich substrata, including tree barks, even in cities due to its pollution tolerant properties. N.B. Physcia tenella s. l. is often very difficult to distinguish from Physcia adscendens and, considering the existence of intermediate morphs, is considered as the same species by different authors. Physcia tenella var. marina taxon is considered as a subsp., a variety or a different morph according to the authors. It grows on rocks and walls near the seashore. This taxon has a rosette-like thallus smaller than the canonical type, is darker grey when dry and its marginal cilia are darker grey-brown.*