Usnea subscabrosa  

Thallus to 4(-6) cm tall, pale green, erect to subpendulous (then 4-10 cm in length) or scrambling (up to 25 cm), forming loose, rather irregular tufts, richly branched especially towards the ends. Main branches rather stout, inflexible, to 1 mm diam., lateral branches finer, not constricted at the base. Thallus surface pale green- to yellow-grey, not blackened at the base but sometimes with red-brown pigmentation, smooth and shining, at times with inconspicuous annulations. Soralia minute, punctiform, even and flat, numerous, mainly on terminal branches. Isidia also developing on young branches but rapidly becoming abraded. Cortex thin, 8-15% of diam., medulla compact.

Anamorph: not known.

Teleomorph: not known.

Chemistry: medulla C–, K–, KC–, Pd+ red (usnic and protocetraric acids).