A common spot for them to rest.
No interactions present.
so haven't filled this in in many of my observations.
Should this section of the Thames be Marine or Freshwater? Same for the Docklands waterways?
A lichen ménage à trois - http://science.sciencemag.org/content/353/6297/337
Some say it's time to throw the textbook understanding of lichens out the window.
"Now there will be more chaos, more confusion in lichenology ,...."
The answer is I understand rather complicated. At the LNHS's 150th year conference there was a presentation on this which, if I remember correctly, basically says that based partially on analysis aquatic flora as you move downstream along the Thames it essentially becomes a marine environment.
I think by the time you are on East London Docklands marine would be appropriate. Further west it is ambiguous.
I wasn't happy with the total Freshwater option but assume there must be a mix - the tide movements are amazing to watch. We are able to observe a "garbage trap" which changes direction with the tides.
Lat/Lng: 51.5016, -0.0279
OS grid ref: TQ369799
On the Thames, in direct line with Cuba Street.