Auckland Islands, Enderby Island, near Sandy Bay, on Oreobolus pectinatus Hook. f. [Cyperaceae], March 21, 2000, E.H.C. McKenzie (PDD 83421 – II).Campbell Island (Dingley 1977; McKenzie and Foggo 1989), Homestead Flat, on O. pectinatus, November 21, 1975, B.M.May (PDD 34185 – II, III, 34186 – II, III).

Uredinia amphigenous, bullate, up to 0.75 x 0.25 mm,long-covered by a shield-like flap of epidermis, cinnamon colored. Urediniospores (23–)26–32(–35) x (18–)20.5–25.5(–28) µm (mean of 63 spores, 29.2 x 23.3 µm), subglobose, ellipsoid, obovoid, sometimes angular; wall2–3 µm thick, cinnamon brown, echinulate, germ pores 2, equatorial.

This rust was described from Samanzing, Papua New Guinea on Oreobolus sp. (Cummins 1941). Dingley (1977) found a few teliospores intermixed with urediniospores in the two Campbell Island specimens, but no teliospores were seen in the more recent Auckland Islands specimen, and they could not be located on the Campbell Island specimens.The rust is not known on Oreobolus in mainland New Zealand. The current distribution of Papua New Guinea and the subantarctic islands of New Zealand is unusual fora rust fungus. However, Samanzing is about 2000 m above sea level, and a similar distributional pattern encompassing New Zealand, New Guinea, New Caledonia, and Solomon Islands exists for several genera of agaricales (Horak 1983). Oreobolus is a mainly Southern Hemisphere genus, but it also occurs in Hawaii, Malaysia, and Central America.