Irish lichens

Arthopyrenia punctiformis

Order: Incertae sedis       Family: Arthopyreniaceae

Species: Arthopyrenia punctiformis

Growth type crustose
Photos: On Horse-chestnut twig. Ardsallagh, Co. Waterford, Ireland

The inconspicuous, non-lichenised thallus has small, +/- circular, clustered or scattered perithecia. Pycnidia are absent. Spores are initially colourless, 1-septate, 16-20(-22) x 4.5-5 Ám. Microscope photograph below.

Common as an early coloniser on smooth twigs and small branches of young trees and shrubs.

Arthopyrenia punctiformis

Microscope photograph
Arthopyrenia punctiformis
Arthopyrenia punctiformis. April 2012

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