Order: Pyrenulales       Family: Pyrenulaceae Species: Pyrenula chlorospila Growth type crustose. Photos: On mature Ash trunk. Ballingeary, Cork, SW Ireland. Waxy greenish to pale brown thallus flecked with small white pseudocyphellae. Small spherical black perithecia approx 0.3mm in diameter. Spores 3-septate, (25-)28-32(-35) × (9-)11-13(-14) µm. Mosiac-forming with a black prothallus. Smooth-barked trees e.g Holly, Hazel, Beech, Ash in shady woods. K+ yellow, P+/- yellowish, UV- Similar: Pyrenula macrospora. Larger black perithecia.

     


Pyrenula chlorospila on Ash, Ballingeary area, Co.Cork. December 2008