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Chris Parrish can probably better suggest on-line resources, but I would recommend the British Lichen Society as a starting place. They have a good page of links, for example.
I don’t know what literature is available in Europe, but Lichens of North America by Ernie Brodo will cover all the same groups that are present in Europe, if not all the species. I would make learning the genera your initial goal, if you are truly interested in learning. Brodo’s book is excellent for that purpose.
You can also get a very brief overview of terminology, basic anatomy, and techniques right here on MO by looking at what I’ve written in the description under Lichen sp..
As I know where the place is, I will try to revisit it in a forthcoming oportunity, hoping that still exist something there (the observation was made 3 months ago). In the meantime can you recommend to me some websites where I can learn about Lichen?
Ah, it happens to us all. Still, even blurred like that, I can see dots of some sort on the lower surface, confirming that it is either Sticta or Pseudocyphellaria. Definitely not a North American species. It looks much like a Pseudocyphellaria crocata with a white medulla instead of yellow. The things to look for are:
In both cases, the underside should be covered with a coarse short dirty-white tomentum. Other things to look for that may help ID it to species are:
1) presence of granules or powdery dots or lines on the upper side
2) presence of round apothecia on the upper side
3) shape of the margin; it looks like the margin is ragged; is it covered with tiny little lobules? or are there tiny granules or finger-like structures covering the margins?
4) texture of the surface: is it ridged or smooth?; is it a solid gray or does is it mottled with dots or a network of irregular lines and splotches?
It looks like a spectacular population. I’ve seen Sticta beauvoisii, Pseudocyphellaria crocata and P. aurata form enormous populations like this before when conditions are good. All of these species reproduce vegetatively; I suspect yours must as well in order to produce such a large colony.
Created: 2010-06-14 06:14:12 PDT (-0700)
Last modified: 2010-06-14 06:14:14 PDT (-0700)
Viewed: 113 times, last viewed: 2017-06-07 17:13:37 PDT (-0700)