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Puccinia heterospora Berk. & M.A. Curtis

Description
Telia on lower leaf surface, subepidermal, erumpent, dome-shaped, up to 250 µm, reddish brown, crowded in circular or irregular patches up to 1 cm diam., corresponding upper leaf surface purplish with a diffuse chlorotic margin.

Teliospores globose, subglobose or broadly ellipsoidal, apex rounded or truncate, 2 celled, about 10% of cells with a longitudinal or rarely transverse septum, on average larger than mesospores, yellowish brown to pale reddish brown, 24‒35 × 20‒26 µm; wall 1.5‒3.0 µm thick at sides and 2‒5 µm thick at apex, smooth, with a single persistent pedicel, up to 120 µm.

Mesospores 1 celled, 19‒26 × 15‒22 µm.

Hosts
Host family: Malvaceae
Host species: Sida spinosa

Distribution
QLD

Comments
Puccinia heterospora was first reported from Australia on Herissantia crispa (as Abutilon crispum) from Queensland and on Abutilon aviccenae from New South Wales (Cooke 1892). In the specimen on Sida spinosa illustrated here, the one-celled teliospores (mesospores) are abundant and two-celled teliospores account for less than 10% of the total.

Highslide JS
Puccinia heterospora on Sida spinosa - BRIP 58538.
Highslide JS
Puccinia heterospora on Sida spinosa - BRIP 58538.
Scale bar = 1 cm.
Highslide JS
Telia of Puccinia heterospora on Sida spinosa - BRIP 47871.
Scale bar = 1 mm.
Highslide JS
Teliospores of Puccinia heterospora on Sida spinosa - BRIP 58538.
Scale bar = 10 µm.