As you can see, the panes of glass have been stacked and so there is a lovely depth image.
I thought I would look up dyeing with lichen and have come across some interesting sites.
This one made me think I need to know more - it talks about fermenting the lichen, something I haven't heard of before. Not that I have done much research.
Another interesting blog but not the info I wanted.
More interesting info. A bit more for ideas on how to use the lichen, and that it can be stored for a while, while I make up my mind what to do with it.
Some information about dyeing with lichens in Australia.
This might be what is on the glass - but no, I think this is more like it. Or this? Or this? Oh dear, more research needed!!
I have looked up India Flint's Eco Colour but she only gives passing reference to lichen dyeing as it is not ecologically sound. The plants take too long to grow, may be rare and synthetic dyes will do the same job.
This could be the one I photographed at Rosanna recently, on the back of a seat. (By the way, that post was about the wintry weather we had - for a few, very few, days - it is very warm and springlike at the moment. We had the warmest winter on record this year.)