| Re: Dibbinsdale Lichen
Number 1 is difficult as we really need to have a sharper view of the surface features. As I said in another post, lichen photography is not easy, with the slightest camera movement enough enough to obscure critical details.
Deer Stalker's suggestion of Flavoparmelia caperata is certainly possible. It doesn't look quite right, colour looks a bit wrong, but the species is horribly variable.
Number 2 is Physcia tenella. The characteristic marginal cilia are visible in the photograph and the thallus tips are upturned and sorediate (producing asexual reproductive granules).
P. tenella is a species that has become much more common in recent years as a result of nitrogen deposition, primarily from vehicle exhausts. In my own area it now dominates many urban tree trunks.
I am still learning (slowly) my crustose genera and tend to duck white patches on rocks. However, from the large, convex apothecia, I think number 3/4 is a Porpidia species and from the very thin, greyish thallus, I would suggest P. macrocarpa as a hypothesis. The black prothallus possessed by this species is just visible in the left of the photograph.
Porpidia species are difficult though, and I may be wrong about the genus anyway.
Alan Silverside  |