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Thekopsora minima (Arthur) Syd. & P. Syd.

Description
Uredinia on lower leaf surface in groups up to 5 mm diam., confluent, vein limited, on necrotic spots with corresponding upper leaf surface dark brown with a bright red diffuse border, subepidermal, erumpent, round, 100‒200 µm diam., yellow; peridium present with a central pore.

Urediniospores subglobose, ellipsoidal or obovoid, yellow, 15‒27 × 13‒19 µm; wall 1‒2 µm thick, echinulate.

Hosts
Host family: Ericaceae
Host species: Vaccinium corymbosum

Distribution
NSW, QLD

Comments
Thekopsora minima was reported as the cause of blueberry rust in Australia by McTaggart et al. (2013). Naohidemyces vaccinii is morphologically similar to T. minima, and occurs on species of Vaccinium, however it is not regarded as a pathogen of blueberry (Sato et al. 1993).

Highslide JS
Thekopsora minima on Vaccinium corymbosum (upper leaf surface) - BRIP 52162.
Scale bar = 1 cm.
Highslide JS
Thekopsora minima on Vaccinium corymbosum (lower leaf surface) - BRIP 52162.
Scale bar = 1 cm.
Highslide JS
Thekopsora minima on Vaccinium corymbosum - BRIP 52162.
Scale bar = 5 mm.
Highslide JS
Urediniospores of Thekopsora minima on Vaccinium corymbosum - BRIP 52162.
Scale bar = 10 µm.