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Puccinia allii sensu lato

Description
Uredinia on both leaf surfaces, subepidermal, erumpent, round, yellow, peridium present.

Urediniospores ellipsoidal, obovoid or oval, subhyaline to yellow, 26‒34 × 21‒27 μm; wall 1.0‒2.5 μm thick, apex not thickened, echinulate, 21‒33 spines per 10 μm2, with 7‒10 scattered germ pores.

Telia on both leaf surfaces, subepidermal, linear, black.

Teliospores clavate, apex rounded to truncate, mostly two-celled spores (~90‒95%), yellowish brown, constricted at septum, smooth walled; one-celled spores oval to clavate, 35‒58 × 16‒17 μm; two-celled spores 42‒65 × 16‒20 μm; wall 1.5‒2.0 μm thick at sides, 3‒7 μm at apex, upper cell ellipsoidal to doliiform, 19‒29 × 16‒20 μm, lower cell clavate, paler than the upper cell, 26‒38 × 11‒15 μm, gradually tapered to a narrow base 4‒6 μm.

Hosts
Host family: Alliaceae
Host species: Allium fistulosm
Allium sativum

Distribution
QLD, SA, TAS, VIC

Comments
McTaggart et al. (2016) reported this rust on Allium sativum and A. fistulosum from Australia and China. It is possibly a recent introduction to Australia. The diagnostic characters are 90-95% 2-celled teliospores that usually have a thickened apex up to 7 µm.

Highslide JS
Puccinia allii sensu lato on Allium sativum - BRIP 59724.
Highslide JS
Puccinia allii sensu lato on Allium sativum - BRIP 59724.
Scale bar = 1 cm.
Highslide JS
Urediniospores of Puccinia allii sensu lato on Allium sativum - BRIP 59724.
Scale bar = 10 µm.
Highslide JS
Teliospores of Puccinia allii sensu lato on Allium sativum - BRIP 59724.
Scale bar = 10 µm.