Growing on the bark of an old Quercus suber. The soredia accumulates at the margins of lobes and, in mature specimens, spread to cover the thallus centre. A peculiarity of the 1st specimen is that it is fertile (see the top of the first photo attached, mainly on the right), which is rare or very rare for the species P. enteroxantha, according to the references. The apothecia are different from what I'm used to see in other species of Physconia. I tryed to confirm this, searching the internet for images of fertile specimens of P. enteroxantha_, with few success. I was only able to see apothecia in one of the Sharnoff photosenteroxantha.html (Nº 15) and these are similar shaped to those of mine and a bit darker. There were more specimens on the same tree, one with only one apothecium (see 2nd specimen) and the others unfertile (see 3rd and 4th specimens). In younger specimens the surfaces were slightly pruinose and the strong squarrose rhizines can be seen even from above. The species P. perisidiosa, considered to be similar to P. enteroxantha_, is also rarely fertile. Again, I was only able to see a fertile specimen in Sharnoff photosperisidiosa.html (Nº 4). The apothecia can be considered similar to those of P. enteroxantha. Taken into account the color, the form and distribution of soredia, the chemical reactions and the underside of lobes I believe that these specimens belong to the species P. enteroxantha.