Uromyces gladioli on Gladiolus

Uromyces gladioli is considered of quarantine significance for the U.S. It has been reported from central and southern Africa on species of Babiana, Gladiolus, Geissorhiza, Moraea, and Romulea (Iridaceae).

Uromyces gladioli Henn., Hedwigia 34: 326. 1895.

Spermogonia and aecia unknown.

Uredinia amphigenous, scattered or in groups, often confluent, minute, irregularly round to oblong, up to 0.5 mm long, yellow, subepidermal becoming erumpent; urediniospores globose, subglobose or ovate, subhyaline to pale golden brown, 20-25 × 15-23 µm, wall hyaline, 2-3.5 µm thick, minutely verrucose; germ pores 6-9 (obscure), scattered.

Telia amphigenous, scattered or in linear groups, elliptic or oblong, often irregular, up to 1 mm, subepidermal, compact, dark brown to black, long covered by epidermis, without paraphyses; teliospores chestnut brown, globose, subglobose, ellipsoid, ovoid, or angular through mutual pressure, apex usually rounded, sometimes truncate or conical, base round or attenuate, 20-37(-40) × 18-26 µm, wall smooth, 2-3.5 µm thick, 5-9 µm thick at the apex; pedicel persistent, brown near the apex, 5-7 µm wide, up to 75 µm long.

Hosts: Babiana, Gladiolus, Geissorhiza, Moraea, and Romulea (Iridaceae).

Geographic distribution: Central and southern Africa.

Specimen examined: on Gladiolus angustus L., South Africa, Cape, leg. Leibold sn. (B 70 0005184) II-III, Type of Uromyces gladioli Henn.

Two other species of Uromyces are reported on Gladiolus: U. nyikensis and U. tranversalis, also considered quarantine plant pests for the U.S. Uromyces gladioli is similar to U. nyikensis in the production of telia without paraphyses, but the teliospores of U. nyikensis are smaller, 19-32 × 14-22 µm. Sori of Uromyces tranversalis are transverse across the veins and 0.5-3 mm long, while in Uromyces gladioli sori are not transverse and up to 1 mm long (Smith et al 1992). Additional rust fungi reported on Gladiolus include Uredo gladioli-büttneri, a species that lacks teliospores, and Puccinia gladioli and Puccinia maccleani in which the teliospores are one-septate.

References:

Doidge, E.M. 1926. A preliminary study of the South African rust fungi. Bothalia 2: 1-227.

Doidge, E.M. 1941. South African rust fungi IV. Bothalia 4: 229-236.

Doidge, E.M. 1948. South African rust fungi VI. The species of Uromyces on Iridaceae. Bothalia 4: 919-937.

Smith, I.M., McNamara, D.G., Scott, P.R., and Harris, K.M., Eds. 1992. Quarantine Pests for Europe. CAB International with EPPO, 676 pages.

Nomenclature

Specimens in BPI

Additional distribution data

Suggested citation: Hernández, J.R. Systematic Mycology and Microbiology Laboratory, ARS, USDA. 28 January 2005. Invasive Fungi. Uromyces gladioli on Gladiolus. Retrieved November 21, 2009, from http://nt.ars-grin.gov/sbmlweb/fungi/index.cfm .