Family: Naetrocymbaceae Naetrocymbe punctiformis (Arthopyrenia punctiformis) Growth type crustose 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. Chemical reactions negative Similar: Arthopyrenia analepta. Larger perithecia 0.3-0.6mm long

Microscope photograph



Naetrocymbe punctiformis (Arthopyrenia punctiformis). April 2012