Pseudevernia intensa is one of the easiest lichens in the forest to identify. It is a strongly branched grayish-white lichen with brown apothecia freq
A lichen is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic relationship. Pseudevernia intensa is one of the easiest lichens in the forest to identify. It is a strongly branched grayish-white lichen with brown apothecia frequently present. The undersurface is gray. Dark spots (pycnidia) are easily seen with magnification on the upper surface especially along the margins. There are 8 elliptic single celled spores per ascus. The cortex is pale yellow in KOH, and the medulla is red in sodium hypochlorite. The photobiont appears to be Trebouxia. P. intensa is found on tree branches at upper elevation.
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Photo credit: © Phil Degginger / Alamy / Afripics
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Keywords: composite, foliose, intensa, lichen, mutualistic, organism, photobiont, pseudevernia, relationship, trebouxia
