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Austropuccinia psidii (G. Winter) Beenken

Description
Uredinia on leaves and petioles, associated with a diversity of leaf spots dependent on the host species, single or aggregated in groups, mostly amphigenous on young shoots and leaves, mostly abaxial on older leaves, subepidermal, erumpent, round, up to 0.5 mm, bright yellow to yellowish brown.

Urediniospores ellipsoidal or ovoid, pyriform, yellowish brown, 17‒21 × 13‒17 µm; wall 1.5‒2.0 µm thick, finely echinulate with a distinctive smooth patch in the lower half, germ pore absent or inconspicuous.

Telia on fruit, leaves or stems, up to 0.5 mm diam., abaxial, erumpent, pulvinate, yellow to yellowish brown.

Teliospores cylindrical or ellipsoidal, apex rounded, pale yellowish brown, 23‒50 × 14‒28 µm; wall 1‒2 µm thick, smooth, 2 celled, remnant of pedicel remains attached up to 15 µm long.

Basidia cylindrical, up to 110 µm long x 6‒8 µm wide, hyaline, 4-celled, produced from each cell of the teliospores, apically in upper cell and laterally in lower cell.

Basidiospores globose or pyriform, 8‒11 µm diam., hyaline, smooth, germinate in situ and without dormancy from an apical germ pore.

Hosts
Host family: Myrtaceae  
Host genera: Acmena
Acmenosperma

Agonis
Anetholea
Asteromyrtus
Austromyrtus
Backhousia
Callistemon
Chamelaucium
Choricarpia
Darwinia

Decaspermum
Eucalyptus
Eugenia
Gossia
Homoranthus
Hypocalymma

Lenwebbia
Leptospermum

Lindsayomyrtus
Lophostemon
Melaleuca

Metrosideros
Myrciaria
Myrtus
Pilidiostigma
Rhodamnia
Rhodomyrtus
Ristantia

Sphaerantia
Stockwellia
Syzygium
Thryptomene
Tristania
Tristaniopsis
Uromyrtus

Waterhousea
Xanthostemon

Distribution
NSW, QLD, VIC

Comments
Austropuccinia psidii is a native South American rust that first appeared in Australia on the Central Coast of New South Wales in 2010 (Carnegie et al., 2010). It has spread northwards along the east coast to the wet tropical rainforests of northern Queensland and is now established on over 160 plant species in 38 genera of Myrtaceae (Pegg et al. 2013). It threatens several endangered species, including Rhodamnia angustifolia, Rhodamnia maideniana, Gossia gonoclada and Backhousia oligantha (Pegg et al. 2013).