Lecanographaceae Zwackhia prosodea (Opegrapha prosodea) Growth type crustose. Chemical results and UV negative Old woodland and parkland species found on dry, shaded bark of mature and old Yew and Oak. BLS conservation evaluation: NT NS P Eng Wa IR Thin greyish, green or olive-brown thallus with scattered or contiguous, straight or curved lirellae. Discs persistently slit-like with swollen exciple. Spores 8-14 septate, (40-)50-70(-80) x 6-8 µm with a narrow perispore. Microscope photographs below. Similar: O. viridis. Usually on younger bark, smaller knot-like apothecia

Microscope photographs



Zwackhia prosodea (Opegrapha prosodea)
Lytchett Matravers, Dorset. January 2014