Puccinia glyceriae (anam. Aecidium hydrangeae-paniculatae)

Puccinia glyceriae S. Ito, J. Coll. Agric. Tohoku Univ. 3:200. 1909.

Puccinia glyceriae is an heteroecious, macrocyclic rust considered of quarantine importance in the U.S. The uredinial and telial stages are produced on the grass Glyceria, commonly referred to as manna grass. The name Aecidium hydrangeae-paniculatae has been applied to the spermogonial and aecial stages produced on panicled hydrangea (Hydrangea paniculata). This host plant is an ornamental originally from Japan and western China that is widely cultivated in the U.S. and other parts of the world.

Spermogonia mostly epiphyllous, in orange-yellow lesions, yellow to brown, subepidermal, flask shaped; type 4 (Hiratsuka & Hiratsuka 1980).

Aecia mostly hypophyllous, cupulate, pale yellow, peridial cells 24-32 × 16.5 22 µm, outer wall strongly verrucose, inner wall finely to striate verrucose; aeciospores globose to broadly ellipsoid, 19-26.5 × 15-22 µm, walls 0.7-1.2 µm thick, hyaline, finely verrucose.

Uredinia mainly epiphyllous, yellow to pale brown, without paraphyses; urediniospores globose to broadly ellipsoid or obovoid, 15-25 × 14-23 µm, walls 1-1.5 µm thick, pale yellow, echinulate with 6-8 scattered germ pores.

Telia amphigenous, mainly hypophyllous, covered by epidermis or sometimes erumpent, blackish brown, along veins, 0.5-3 mm long, without paraphyses; teliospores mostly clavate, sometimes cylindrical, 28-66 × 10-21 µm, walls 1-2 µm thick at sides and 1.5-7.5 µm thick at apex, apex unevenly thickened, chestnut brown, smooth, with a few longitudinal ridges; pedicels short, pale brown, persistent, mostly less than 12 µm long.

Hosts: spermogonial and aecial stages on Hydrangea paniculata Siebold (Hydrangeaceae); uredinial and telial stages on species of Glyceria (Poaceae).

Geographic distribution: reported only from Japan on Hydrangea and Glyceria spp.

The heteroecious condition and the connection of the spermogonia-aecial stages of A. hydrangeae-paniculatae on Hydrangea paniculata with uredinial-telial stages of P. glyceriae on Glyceria leptolepis was established by Okane and Kakishima (1991) based on field observations and inoculations.

Although there are other rusts on Hydrangea in other parts of the world, Puccinia suzutake Kakish.& S. Sato is the only other Puccinia reported on Hydrangea in Japan. It produces spermogonia and aecia (Aecidium hydrangiicola Henn.) on Hydrangea, and uredinia and telia on Sasamorpha (Poaceae) (Kakishima and Sato 1981). Aeciospores of P. suzutake are angular and measure 24-32 × 20-28 µm, wall 0.5 µm thick, verrucose with characteristic mushroom-shape refractive granules, while aeciospores of P. glyceriae measure 19-26.5 × 15-22 µm, wall 0.7-1.2 µm thick and finely verrucose.

References:

Cummins, G.B. 1971. The Rust Fungi of Cereals, Grasses and Bamboos. Springer-Verlag, New York, 570 pages.

Hiratsuka, H., and Hiratsuka, N. 1980. Morphology of spermogonia and taxonomy of rust fungi. Rep. Tottori Mycol. Inst. 18: 257-268.

Kakishima, M., and Sato, S. 1981. Puccinia suzutake: a new bambusicolous rust, a perfect state of Aecidium hydrangiicola. Trans. Mycol. Soc. Japan 22: 321-328.

Okane, I., and Kakishima, M. 1991. Puccinia glyceriae and its anamorph, Aecidium hydrangeae-paniculatae. Trans. Mycol. Soc. Japan 32: 135-139.

Nomenclature

Specimens in BPI

Additional distribution data

Suggested citation: Hernández, J.R. Systematic Mycology and Microbiology Laboratory, ARS, USDA. 7 March 2005. Invasive Fungi. Puccinia glyceriae (anam. Aecidium hydrangeae-paniculatae). Retrieved November 21, 2009, from http://nt.ars-grin.gov/sbmlweb/fungi/index.cfm .