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Puccinia paullula Syd. & P. Syd.

Description
Uredinia on lower leaf surface, uredinia in spherical substomatal cavities up to 200 µm diam., densely aggregated on circular pale yellow leaf spots up to 1.5 mm diam. that appear brown from the dense mass of urediniospores, leaf spots up to 1.5 mm diam. with coressponding upper surface bright orange yellow with a paler diffuse margin.

Urediniospores produced on pedicels that protrude from the stomata, globose or subglobose, yellowish brown, 22‒31 µm diam.; wall 1.5‒2.5 µm thick, apex unthickened, even, finely and sparsely echinulate.

Telia on lower leaf surface, suprastomatal, dome-shaped, less than 0.5 mm, orange to yellowish brown.

Teliospores ellipsoidal, apex rounded, 2-celled, with vertical or oblique septa, yellowish brown, 26‒35 × 23‒28 µm; wall 2.5‒3.5 µm thick at sides, 3.5‒5.5 µm thick at apex, smooth, pedicel persistent.

Hosts
Host family: Araceae
Host species: Monstera deliciosa

Distribution
QLD

Comments
Puccinia paullula was first reported from Australia on Monstera deliciosa by Cook and Dube (1989). Shaw (1991) tested the host range of P. paullula and determined that species of Monstera and Epipremnum were susceptible. Preliminary molecular phylogenetic analysis has shown a close affinity between P. paullula and P. rhaphidophorae on Rhaphidophora from Australia and the Philippines (unpublished).

Highslide JS
Puccinia paullula on Monstera deliciosa - BRIP 59822.
Highslide JS
Puccinia paullula on Monstera deliciosa - BRIP 52218.
Scale bar = 1 cm.
Highslide JS
Urediniospores of Puccinia paullula on Monstera deliciosa - BRIP 59822.
Scale bar = 10 µm.
Highslide JS
Teliospores of Puccinia paullula on Monstera deliciosa - BRIP 59822.
Scale bar = 10 µm.