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Puccinia caricis (Schumach.) Rebent.

Description
Uredinia on both leaf surfaces, often covering the entire surface, subepidermal, erumpent and long covered by the persistent host epidermis, linear, up to 2 mm long, brown.

Urediniospores ellipsoidal, obovoid, or slightly asymmetrical, yellowish brown, 21‒30 × 15‒19 µm; wall 1‒2 µm thick, minutely and sparsely echinulate, smooth in profile, with 2‒3 conspicuous superequatorial germ pores, remnants of pedicel sometimes attached.

Telia on leaves, both surfaces, subepidermal, erumpent, linear, reddish brown or black.

Teliospores cylindrical, fusiform narrowed towards the base or clavate, apex rounded, 2 celled slightly constricted at the septum, lower cell distinctly paler, narrower and with thiner walls than the upper cell, pale yellowish brown, 35‒70 µm × 9‒21 µm; wall 1.0‒2.5 µm thick, thickened at apex, 4‒11 µm at apex, smooth, single, pedicel persistent subhyaline, up to 60 µm.

Hosts
Host family: Cyperaceae
Host species: Carex appressa

Distribution
QLD

Comments
There are several rust fungi known on Carex spp. throughout the word (Zhuang 1988). Puccinia caricis is one of three species on Carex reported from Australia, together with P. longispora (McAlpine 1906) and P. caricina (Cooke and Dube 1989). Zhuang (1988) considered that P. caricis represented a complex of species with similar morphological features, i.e., ellipsoidal or obovoid urediniospores with 2‒4, usually 3, equatorial germ pores as well as clavate teliospores with rounded, truncate or obtuse apices that are mostly 5‒15 um thick (Zhuang 1988). The rusts on Carex spp. in Australia require revision.