Verrucaria obfuscans1.jpg

Creative Commons Licence

Verrucaria obfuscans, seen as a dark brown crust dominating the lower part of this iron-stained, limestone windowsill, Great Milton church, Oxfordshire.

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