Spermogonia amphigenous, in groups, 80-90 µm diam., subepidermal, globose, whitish to yellow-brown.
Aecia hypogenous, on circular red or deep purple spots, 0.5-1.5 cm diam., in dense clusters, shortly cylindrical or cup-shaped, with a !aciniate, white, recurved margin, the spore mass white. Aeciospores 16-26 µm diam., verruculose, nearly hyaline.
Uredinia amphigenous, scattered or ± gregarious, elliptical or linear, sometimes confluent, rather large, convex, pulverulent, brown, without paraphyses. Urediniospores 25-35 µm diam., subglobose or obovoid, brownish, the contents hyaline, the wall 3-4 µm thick, verruculose, with four equatorial pores.
Telia numerous, similar but larger and thicker, very convex and compact, black. Teliospores 45-65 x 16-25 µm, ± cylindrical, rounded at both ends or with the apex somewhat attenuated, constricted at the septum, deep yellowish-brown, wall 2-3 µm thick at the sides, paler and thicker (4-7 µm) above, smooth or sometimes with very fine granulations; pore of upper cell apical, of lower close to the septum; pedicels 100-200 µm long, hyaline or yellowish, thick, persistent.
Not formally assessed, but the species is common and widespread.
Spermogonia and aecia on living leaves of Rumex spp., including R. acetosa, R. conglomeratus and R. obtusifolius. Uredinia and telia on living leaves of Phragmites australis.
Throughout the British Isles, probably coextensive with the hosts.