Differs from L. pulvinatum (see _observatiom 160725) by having cylindrical isidia at the tips of lobes, which are flattened in that species.
Let me take this observation to make some considerations about my more recent observations. Starting from observation 160116 and counting this one, I posted twenty observations from the same place with the same number of different species, each of them devoted to a species belonging to the so-called “Lobarion community”. Summarizing:
4 species of Lobaria: L. amplissima, L. macaronesica, L. pulmonaria, L. scrobiculata;
3 species of Leptogium: L. cyanescens, L. lichenoides, L. pulvinatum;
3 species of Sticta: S. limbata, S. fuliginosa, S. sylvatica;
2 species of Degelia: D. atlantica, D. cyanoloma;
2 species of Nephroma: N. laevigatum, N. parile;
and the species: Acorcordia gemmata, Menegazzia terebrata, Normandina pulchella, Pannaria conoplea, Peltigera collina, Pseudocyphellaria aurata.
Even if a few of them are not correctly identified, If some time ago someone told that this would be possible, probably I would call him insane. Moreover, this was my first trip to the place that, certainly, have much more to offer. Let hope that!
I have many more observations of most of the species already posted and of some other species that, though not belonging to the “Lobarion community”, are also interesting. I will post some of them in the near future.
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Your reasoning goes along nicely with James Lendemer’s idea that habitat fragmentation is a critical factor for lichen diversity. Not pollution, for example. While pollution will kill lichens for sure, mere absence of pollution will not always result in great diversity. So the trick is to explain exceptional diversity such as this site has to offer. And that may as you say have to do with being undisturbed (except for ground level) for so long. Thanks for sharing your thoughts.
Yes, I can speculate. As I have said before Portugal is a small country but have a high diversity of climate niches combined with some unexploited zones by man (that is, if some agriculture happens there it is only subsistence farming and not large-scale agriculture).
Of course all is governed by the Atlantic and Mediterranian influences, but some of those places remain with the same trees and rocks for large decades, which is particularly convenient for the development of many of lichen species. In the case of this particular place, now it is a public park that suffered at the ground level some recent intervention, but not on the trees. This is the reason for, as an example, not to find there any Peltigera sp., when was expectable to find some; But if you go arround some meters from the interventioned zone you will find some, as I did last time I was there, but then you can suffer the consequences in your body…
Other locations, like Matinha de Queluz (only some kilometers from the main city Lisbon), Mata da Margaraça (at the center of the country, where I was only once) and many small parts of Parque de Monsanto (at the border of Lisbon), Sintra (20 km from Lisbon), Serra de Montejunto (western middle country) , Serra de São Mamede (eastern middle country, border with Spain), and so on, didn´t suffer changes of any kind for decades.
This is I think the (main?) part of the explanation for the corticolous lichens and some of the saxicolous lichens as well. The rest I will try to find out.
You truly must know the lichen flora of Portugal better than anyone. And it’s great that you’re getting to know all the really rich places. Can you speculate about why places such as this are so much better than others? I have long been jealous of the gorgeous Collema, Leptogium, Degelia, Caloplaca that you post regularly on MO. I’d feel very fortunate to find even one specimen as nice as any of those beauties. I hope you realize how fortunate you are!
Created: 2014-03-05 15:08:29 PST (-0800)
Last modified: 2014-03-05 15:14:05 PST (-0800)
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