Umbilicaria polyphylla, section of thallus, showing an algal layer containing green algae in the upper half, and the production of (sparse) thalloconidia at the lower surface.
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith
