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Melampsora ricini Pass.

Description
Uredinia on lower leaf surface, rarely on upper leaf surface, subepidermal, erumpent, round, yellow.

Urediniospores ellipsoidal, ovoid or obovoid, golden yellowish brown, 17‒27  × 13‒21 µm; wall 2 µm thick, echinulate.

Hosts
Host family: Euphorbiaceae
Host species: Ricinus communis

Distribution
NSW, QLD, WA

Comments
Melampsora ricini was first reported from Australia by Shivas et al. (2000).

Highslide JS
Melampsora ricini on Ricinus communis - BRIP 52906.
Highslide JS
Melampsora ricini uredinia on lower leaf surface of Ricinus communis - BRIP 52906.
Scale bar = 1 cm.
Highslide JS
Urediniospores of Melampsora ricini on Ricinus communis - BRIP 52906.
Scale bar = 10 µm.