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Remarks (internal):Rusted G. erianthum is known from Japan. Geranium pratense in Europe and G. sylvaticum in Europe especially in Scandinavia are also rusted. Additionally, the specimens in DAOM indicate that this rust occurs throughout the world on Geranium spp., other than those listed here. Occasionally Uromyces geranii and Puccinia leveillei occur in mixed infections, (DAOM 196878, Alaska), but are separable because the telia of the Puccinia are in large, compact groups and have a general matt appearance with reflected light as opposed to the small, scattered and shiny telia of the Uromyces. The matt versus shiny telia results from the presence of warted teliospore walls in Puccinia versus the smooth walls in this Uromyces.
It is noteworthy that Pelargonium spp. (Geraniaceae) in Africa and Australia bear the macroform rust Puccinia pelargonium-zonalis Doidge. This species is intercepted occasionally at Canadian ports of entry (Ontario, Manitoba, British Columbia) on plants imported from abroad or from the southern United States. Sori, of the stage II and III appear on the underside of leaves as concentric rings providing a ready means of identification.
 
Description type:Non-original description 
Description:Uromyces geranii (DC.) Fries, Summa Veg. Scand., p. 514. 1849.
= Uredo geranii DC. Syn. Pl., p. 47. 1806.
Pycnia conspicuous, amphigenous or petiolicolous, associated with aecia. Aecia bullate, hypophyllous or petiolicolous in compact groups on vascular tissue, usually causing swelling and distortion. Aeciospores globose to ellipsoid and somewhat angular 22.4-38.4 x 16-25.6 µm; wall hyaline, 1.4-2.8 µm thick including verrucae which are densely and evenly scattered over the entire surface; verrucae are 0.7 µm high, 0.3 µm in diameter and 0.3 µm apart; pore plugs absent. Peridium inconspicuous, not protruding as in normal cupulate aecia; peridial cells present, slightly larger than aeciospores and with coarser warts. Uredinia hypophyllous, cinnamon brown, scattered, pulverulent. Urediniospores globose to obovoid, 24-28.8 µm diameter; wall yellow-brown, uniformly 1.4 µm thick, echinulate except for a bare area (tonsure) below pore; pore 1, approximately equatorial. Telia hypophyllous, black-brown, scattered, becoming pulverulent. Teliospores obovoid to ellipsoid, 28-38.4 x 19.2-25.6 µm; wall dark yellow-brown, smooth, uniformly 0.7 - 1.7 µm thick except at the apex where it becomes 4.9-7.7 µm with an abrupt pale yellow cap over the single apical pore; pedicel fragile, usually breaking at 5-10 µm, hyaline.
Hosts: Geraniaceae: Geranium albiflorum Ledeb., G. anemonifolium L'Her., G. erianthum DC., G. platypetalum Fisch. & Mey., G. pratense L., G. sylvaticum L., Geranium sp.
Distribution: Prince Edward Island, New Brunswick, Ontario, British Columbia.
 
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