Anemone-Rosaceae Rust - Ochropsora ariae

Although this rust develops on rosaceous hosts including cultivated apples, it does not seem to be damaging to that crop.

Ochropsora ariae Ramsb. 1915

Spermogonia amphigenous (on both leaf surfaces), more or less evenly scattered, subcuticular, conical, 110-140 µ wide × 60-100 µ high.

Aecia hypophyllous or on abaxial leaf surface, aecidioid, surrounded by well-developed peridium, cupulate; peridial cells cubical, outer walls smooth, inner walls verrucose; aeciospores produced in chains, subglobose or broadly ellipsoid, often angular, 14-27 × 13-21 µm, walls thin, hyaline, densely warted.

Uredinia Uredinia hypophyllous or on abaxial leaf surface, minute, round, 0.15-0.25 mm diam; paraphyses incurved variable in size, 29-77 × 8-19 µm wide; urediniospores broadly ellipsoid or obovoid, 21-28 × 17-23 µm, walls 1.5-2 µm thick, hyaline, verrucose to echinulate.

Telia hypophyllous, scattered or irregularly aggregated on yellowish to reddish spots, subepidermal, becoming erumpent; teliospores broadly cyindric, round at apex, 35-65 × 9-18 µm, 4-celled basidia continuously replacing teliospores; basidiospores oboviod to ellipsoid or narrowly ellipsoid, 20-25 × 7-10 µm; probasidia developing under host epidermis, sessile, walls thin and fragile, oblong to cylindrical, variable in size from 27-47 × 9-18 µm.

See Hiratsuka et al.(1992) and Ono (2006) for more detailed descriptions.

Host range: The spermogonia and aecial stages occur on Anemone while the uredinial and telial stages develop on various genera of Rosaceae including Amelanchier, Aruncus, Pyrus, Sorbus, and infrequently on Malus and Prunus.

Geographic distribution: Widespread in Asia (China, Japan, Nepal, Taiwan, thailand) and Europe (Bulgaria, Denmark, Finland, Germany, Greece, Norway, Poland, Russia, Sweden, Turkey, United Kingdom).

Notes: The telial stage of this rust species occurs on a wide range of rosaceous hosts while the aecial stage develops on Anemone. However, few studies have been made to confirm these hosts. Based on artificial inoculation experiments, Ono (2006) confirmed that the spermogonial and aecial host of Ochropsora ariae was Anemone pseudo-altaica producing the telial stage on Aruncus dioicus var. tenuifolius.

References:

Adamska, I. 2001. Microscopic fungus-like organisms and fungi of the Slowinski National Park. II. (NW Poland). Acta Mycol. 36: 31-65.

Bahcecioglu, Z., and Gjaerum, H.B. 2004. New and rare rust fungi (Uredinales) from Anatolia (Turkey) - 2. Mycotaxon 90: 55-68.

Henderson, D.M. 2000. Checklist of the Rust Fungi of the British Isles. British Mycological Society, 36 pages.

Henderson, D.M., and Bennell, A.P. 1979. British rust fungi: additions and corrections. Notes Roy. Bot. Gard. Edinburgh 37: 475-501.

Hylander, N., Jorstad, I., and Nannfeldt, J.A. 1953. Enumerato Uredinearum Scandinavicarum. Opera Bot. 1: 1-102.

Ono, Y. 2006. Taxonomic implications of life cycle and basidium morphology of Ochropsora ariae and O. nambuana (Uredinales). Mycoscience 47: 145-151.

Zhuang, W.-Y., Ed. 2005. Fungi of northwestern China. Mycotaxon, Ltd., Ithaca, NY, 430 pages.

Nomenclature

Specimens in BPI

Additional distribution data

Suggested citation: Yun, H.Y. Systematic Mycology and Microbiology Laboratory, ARS, USDA. . Invasive Fungi. Anemone-Rosaceae Rust - Ochropsora ariae. Retrieved November 21, 2009, from http://nt.ars-grin.gov/sbmlweb/fungi/index.cfm .