Pyrenula occidentalis 9.jpg

Creative Commons Licence

Pyrenula occidentalis, section of perithecial apex (Powell 834) mounted in K, showing the K+ purple-red reaction of pigment in the outer layer.

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