LICHALP

Mycomicrothelia pachnea (Körb.) D. Hawksw.

Syn.: Microthelia pachnea Körb.

Non- or doubtfully lichenised.

Substrate: bark

Altitudinal distribution: montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies)

Note: doubtfully lichenised with trentepohlioid algae, thalline patches whitish, from which the scattered ascomata arise, ascomata (to 0.3 mm in diam.) immersed in the periderm, with only the ostiolar region exposed, involucrellum dimidiate, dark reddish-brown, consisting of a mixture of host cells and hyphae, exciple of intricate, hyaline to brownish hyphae, interascal filaments numerous, anastomosing and persistent, asci 8-spored, fissitunicate, and dark brown, 1-septate ascospores (16-18 × 7-8 µm) with unequal cells and a thin, distinctly verruculose perispore; on bark of Abies (records from deciduous trees are doubtful); there are only some scattered records from the Eastern Alps, but the species might have been largely overlooked.