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Puccinia malvacearum Mont.

Description
Telia on fruit, leaves or stems, round, up to 1.5 mm diam., sometimes elongated on the stems, scattered or crowded, sometimes in concentric rings, abaxial, subepidermal, initially covered by host epidermis, erumpent, pulvinate, firm, reddish brown to brown, with a greyish bloom from germinating teliospores.

Teliospores ovoid, slightly attenuated at ends or fusiform, apex rounded, yellowish brown, 36‒64 × 14‒26 µm; wall 1‒4 µm thick, sometimes thickened up to 7 µm at apex, smooth, 2-celled, rarely 1- or 3-celled, sometimes slightly constricted at septum, pedicel persistent, septate, up to 150 µm.

Hosts
Host family: Malvaceae
Host species: Alcea rosea
Althaea officinalis

Anoda cristata
Lavatera plebeia
Lawrencia spicata
Malva nicaeensis
Malva parviflora
Malva pusilla
Malva sylvestris

Distribution
ACT, NSW, QLD, SA, TAS, VIC, WA

Comments
Puccinia malvacearum is an autoecious and microcyclic rust, although there is one report of it producing spermogonia (Waterhouse 1953). McAlpine (1906) regarded P. malvacearum as an introduced rust, and noted its presence in Australia since 1857.


Highslide JS
Puccinia malvacearum on Malva parviflora - BRIP 57522.
Highslide JS
Puccinia malvacearum on Malva parviflora - BRIP 52215.
Scale bar = 1 cm.
Highslide JS
Puccinia malvacearum on Malva sp. - BRIP 53731.
Scale bar = 5 mm.
Highslide JS
Teliospores of Puccinia malvacearum on Malva parviflora - BRIP 52215.
Scale bar = 100 µm.
Highslide JS
Teliospores of Puccinia malvacearum on Malva sylvestris - BRIP 60128.
Scale bar = 10 µm.