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Puccinia stylidii McAlpine

Description
Uredinia on lower leaf surface, subepidermal, erumpent, round, up to 1.2 mm, yellowish brown, peridium present.

Urediniospores globose, subglobose or obovoid, apex obtuse, yellowish brown, 22‒26 × 18‒24 µm; wall 1.5‒2.5 µm thick, echinulate to verruculose, with 1 equatorial germ pore.

Telia on stems and both leaf surfaces, erumpent, linear to dome-shaped, black.

Teliospores clavate, apex acuminate or rounded, 1 or 2 celled, reddish brown, 35‒49 × 19‒25 µm; wall 2‒4 µm thick at sides, 6‒10 µm thick at apex, smooth, with persistent pedicel, up to 31 µm.

Hosts
Host family: Stylidiaceae
Host species: Stylidium armeria
Stylidium graminifolium
Stylidium pycnostachyum
Stylidium rigidulum

Distribution
TAS, VIC, WA

Comments
Puccinia stylidii is an endemic Australian rust known only from species of Stylidium (Stylidiaceae). In a systematic study, Puccinia stylidii was shown to be closely related yet distinct from P. lagenophorae, which occurs on several genera of Asteraceae, and four species of rust on Goodeniaceae, namely Puccinia dampierae, P. gilgiana, P. saccardoi and Uromyces scaevolae (McTaggart et al. 2014). Puccinia stylidii differs further from these species by producing urediniospores.

Highslide JS
Puccinia stylidii on Stylidium armeria - BRIP 60107.
Highslide JS
Puccinia stylidii on Stylidium rigidulum - BRIP 51900.
Scale bar = 1 cm.
Highslide JS
Puccinia stylidii on Stylidium rigidulum - BRIP 51900.
Scale bar = 1 mm.
Highslide JS
Urediniospores of Puccinia stylidii on Stylidium armeria - BRIP 60107.
Scale bar = 10 µm.
Highslide JS
Teliospores of Puccinia stylidii on Stylidium sp. - BRIP 50743.
Scale bar = 10 µm.