Family: Naetrocymbaceae Naetrocymbe punctiformis (Arthopyrenia punctiformis) Growth type crustose. Chemical reactions negative Photos: On Horse-chestnut and Oak twigs. Co. Waterford, Ireland The inconspicuous, non-lichenised thallus has small, +/- circular, clustered or scattered perithecia, 0.1-0.25 mm in diameter. Spores are initially colourless, 1-septate, 16-20(-22) x 4.5-5 µm but can sometimes become yellowish-brown and 3-septate when old. Pycnidia are absent. Microscope photograph below. Common as an early coloniser on smooth twigs and small branches of young trees and shrubs, often found with Naevia punctiformis (Arthonia punctiformis) Similar: Arthopyrenia analepta. Larger perithecia 0.3-0.6mm long

Microscope photograph



Naetrocymbe punctiformis (Arthopyrenia punctiformis). April 2012