Collection location: Parque de Monsanto, Lisboa, Portugal [Click for map]
Very strange form of lobes. Isidia and pycnidia present. No apothecia was found.
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This specimen looks like the lichen version of the Dead Man’s Fingers.
The pseudocyphellae are very conspicuous on those photos, but not on your specimen, but for all I know that is acceptable variation. I wanted to pass Curtis’s comment along to you anyway, in case you hadn’t considered that species. I personally had never heard of inflated Ramalina before, so match or not, it was quite a revelation to me!
Thanks, Jason, for the hint.
However, I must say that I already knew those photographs, since they are available in the site www.irishlichens.ie that I use frequently (see here). These photos are one of the reason that led me to the proposal of Ramalina for the genus of the specimen. As you can see in the above link the species is mentioned as Ramalina siliquosa and there are to types according to the K-reaction. However, in my opinion, none of them corresponds to my specimen, because of the different organization of the thallus.