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Protoparmelia oleagina, growing on weathered lignum. P. oleagina is often sterile and is then rather indistinctive and is sometimes passed over as an algal crust. With experience the gnarled, granular isidiate thallus with a waxy or greasy texture and a dull olive green colour is generally recognisable on sight.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith