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Phragmidium potentillae (Pers.) P. Karst.

Description
Aecia abaxial, yellow, peridium present; paraphyses present, peripheral, clavate or incurved, hyaline, 30‒40 × 12‒13 µm; wall 1 µm thick.

Aeciospores globose, subglobose or obovoid, hyaline to yellow (yellow droplets in fresh collections), 17‒24 × 16‒18 µm; wall 1.5‒2 µm thick, verruculose.

Hosts
Host family: Rosaceae
Host species: Acaena novae-zelandiae

Distribution
TAS

Comments
Phragmidium potentillae was reported from Australia by McAlpine (1906), although it was originally described on Potentilla in the Northern Hemisphere. Cunningham (1924) described three new species of Phragmidium on Acaena in New Zealand that were differentiated by characteristics of the teliospores. Aeciospores were observed in the Australian collections, but are not useful for species delimitation. The aeciospores lack germ pores, but are otherwise identical to the urediniospores. We have applied the name used by McAlpine (1906) for the records of Phragmidium on Acaena in Australia.

Highslide JS
Phragmidium potentillae on Acaena novae-zelandiae - BRIP 60089.
Highslide JS
Phragmidium potentillae on Acaena novae-zelandiae - BRIP 60089.
Scale bar = 5 mm.
Highslide JS
Aeciospores of Phragmidium potentillae on Acaena novae-zelandiae - BRIP 60089.
Scale bar = 10 µm.
Highslide JS
Paraphyses of Phragmidium potentillae on Acaena novae-zelandiae - BRIP 60089.
Scale bar = 10 µm.