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Umbilicaria cylindrica
Foliose lichen. The thallus is attached at central point, and is divided into multiple lobes.The colour is grey to brownish-grey above, lacking isidia. The lower surface is pale brown, with variable complement of often flattened, pale rhizinomorphs (non-attaching rhizines). The margins are lobular with variable development of fringing, grey-brown cilia. Apothecia are black, somewhat raised, discs with multiply infolded margins (gyrose).
Common on exposed rocks and boulders. Spotted on a siliceous rock at 1500 meters high in a pine tree (Pinus sylvestris) forest at Sierra de Guadarrama.
Camera Model: NIKON D300. Exposure Time: 1/60 sec.; f/32; ISO Speed Rating: 400. Focal Length: 90.0 mm. Flash fired
Spotted on Jul 29, 2012
Submitted on Sep 11, 2012
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