The larger colony with very conspicuous joints in the centre of the image is a Cellaria sp. The smaller, more delicate tuft towards the bottom left of the image is a Crisia sp.
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith