Rhytisma acerinum, fully hydrated ascomata with upper wall pushed away to reveal the hymenium. From overwintered leaf of Acer pseudoplatanus, Surrey, England.
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith