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Uromyces trifolii-repentis (Castagne) Liro

Description
Aecia mostly on lower leaf surface and petioles, causing hypertrophy when on leaf veins and petioles, 150‒250 µm diam., up to 200 µm high, mostly in groups, often concentrically arranged, white peridium with yellow spore masses, peridial cells hyaline, polygonally irregular, up to 40 µm long, densely verrucose.

Aeciospores subglobose or polygonal with convex sides, yellow, 16‒24 × 13‒20 µm; wall 0.5‒1.0 µm thick, densely and minutely verruculose.

Uredinia on both leaf surfaces, scattered, bullate, long covered by the translucent host epidermis which ruptures leaving remnants around the margin of the uredinia, subepidermal, erumpent, round, 0.5‒1.0 mm diam., reddish brown.

Urediniospores globose, subglobose or broadly ellipsoidal, yellowish brown, 17‒25 × 15‒20 µm; wall 1‒2 µm thick, echinulate, with 2‒3 equatorial germ pores.

Telia on both leaf surfaces form in the uredinia, subepidermal, erumpent, dome-shaped, reddish brown.

Teliospores subglobose or broadly ellipsoidal, apex rounded, reddish brown, 21‒29 × 15‒21 µm; wall 1.5‒2.0 µm thick with an apical germ pore, smooth in profile, surface sometimes with a few scattered or linearly arranged minute irregular warts, pedicel persistent or deciduous, hyaline, up to 55 µm.

Hosts
Host family: Fabaceae
Host species: Trifolium repens

Distribution
QLD

Rodway (1897) first reported Uromyces trifolii-repentis (as U. trifolii) from Australia on Trifolium repens in Tasmania.

Highslide JS
Uromyces trifolii-repentis on Trifolium repens - BRIP 57653.
Scale bar = 1 cm.
Highslide JS
Aecia of Uromyces trifolii-repentis on Trifolium repens - BRIP 57653.
Scale bar = 1 mm.
Highslide JS
Telia of Uromyces trifolii-repentis on Trifolium repens - BRIP 57653.
Scale bar = 1 mm.
Highslide JS
Aeciospores of Uromyces triodiae on Trifolium repens - BRIP 57653.
Scale bar = 10 µm.
Highslide JS
Urediniospores of Uromyces triodiae on Trifolium repens - BRIP 57653.
Scale bar = 10 µm.
Highslide JS
Teliospores of Uromyces triodiae on Trifolium repens - BRIP 57653.
Scale bar = 10 µm.