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Puccinia rhaphidophorae Syd.

Description
Uredinia on lower leaf surface, suprastomatal, round, less than 0.5 mm, hyaline, subhyaline to yellowish brown.

Urediniospores globose, yellowish brown, 24‒29 × 24‒28 µm; wall 2‒3 µm thick, echinulate, with 1‒3 scattered germ pores.

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

Teliospores ellipsoidal or diorchidioid, apex rounded, 2-celled, separated by vertical or oblique septa, yellowish brown, 23-29 × 20-24 µm; wall 2‒4 µm thick, smooth, with a persistent pedicel, up to 50 µm.

Hosts
Host family: Araceae
Host species: Rhaphidophora australasica

Distribution
QLD

Comments
Puccinia rhaphidophorae and P. paullula infect hosts in the Araceae and have a similar morphology, namely globose urediniospores and teliospores with an oblique or vertical septum. Ono et al. (1988) considered the two species on Araceae conspecific, based on morphology. Shaw (1995) determined P. paullula did not infect Rhaphidophora, but believed the rusts on Araceae formed a complex. Preliminary results from a molecular phylogenetic analysis show that the rusts on Araceae form a species complex (unpublished).

Highslide JS
Puccinia rhaphidophorae on Rhaphidophora australasica - BRIP 59687. Scale bar = 1 cm.
Highslide JS
Urediniospores of Puccinia rhaphidophorae on Rhaphidophora australasica - BRIP 56840.
Scale bar = 10 µm.
Highslide JS
Teliospores of Puccinia rhaphidophorae on Rhaphidophora australasica - BRIP 59687.
Scale bar = 10 µm.