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Phragmidium barnardii Plowr. & G. Winter

Description
Uredinia on leaves, abaxial corresponding to irregular yellowish brown to puplish brown spots on adaxial surface, rarely on adaxial surface, erumpent, round or irregular, up to 1 mm diam., often along veins, yellow; paraphyses cylindrical or clavate, hyaline to pale yellowish brown, 50‒100 × 7‒27 µm; paraphyses wall 0.5‒2.0 µm thick, thickened at apex.

Urediniospores globose, subglobose or broadly ellipsoidal, hyaline to yellow, 17‒21 × 15‒18 µm; wall 0.5‒1.0 µm thick, echinulate with conical spines up to 1 µm high.

Telia on leaves, adaxial, erumpent, brown or black, paraphyses same as those in uredinia.

Teliospores initially formed in uredinia, cylindrical, apex obtuse, yellowish brown at first becoming chocolate brown, 65‒95 × 20‒24 µm; wall 1.0‒2.5 µm thick, up to 4.0 µm thick at apex, smooth, 6‒9 cells; pedicel persistent, hyaline.

Hosts
Host family: Rosaceae
Host species: Rubus parvifolius

Distribution
QLD

Comments
This Australian native rust was first described in 1886 and occurs throughout eastern Australia.

Highslide JS
Phragmidium barnardii on Rubus parvifolius - BRIP 53636.
Highslide JS
Phragmidium barnardii on Rubus parvifolius - BRIP 53636.
Scale bar = 5 mm.
Highslide JS
Urediniospores of Phragmidium barnardii on Rubus parvifolius - BRIP 53636.
Scale bar = 10 µm.
Highslide JS
Urediniospores, paraphyses and teliospore of Phragmidium barnardii on Rubus parvifolius - BRIP 53636.
Scale bar = 10 µm.
Highslide JS
Teliospores of Phragmidium barnardii on Rubus parvifolius - BRIP 53636.
Scale bar = 10 µm.