Usnea silesiaca  

Thallus often ± robust, erect, shrubby to pendulous, 6-12 cm long, richly and irregularly branched. Branches rounded, tapered, never constricted at the point of attachment, surface pale green, matt. Papillae and fibrils few, except that main branches are often ± coarsely papillate towards the holdfast. Basal part of thallus black and here and above with numerous annular cracks. Soralia even, ± flat to slightly tuberculate, raised and then concave, large, conspicuous, punctate to transversely elliptical to irregularly rounded, remaining discrete, moderately dense to dense but rarely becoming confluent. Isidiomorphs irregularly present, generally absent on mature soralia. Medulla compact, narrow, cortex thick.

Anamorph: not known.

Teleomorph: not known.

Chemistry: medulla K+ yellow→red, Pd+ yellow-red (salazinic acid).