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Crossopsora premnae (Petch) Syd. & P. Syd.

Description
Uredinia on lower leaf surface, subepidermal, erumpent, round, less than 300 μm, yellow, paraphyses peripheral, cylindrical, clavate or incurved, up to 2-septate, hyaline, 30‒50 × 11‒13 μm; wall up to 3 μm thick.

Urediniospores obovoid or oval, apex obtuse, subhyaline to yellow, 28‒35 × 19‒21 μm; wall 1‒2 μm thick, echinulate.

Hosts
Host family: Lamiaceae
Host species: Premna acuminata
Premna serratifolia

Distribution
QLD, WA

Comments
Crossopsora premnae was first reported on Premna acuminata in Western Australia (Shivas 1989).

Highslide JS
Crossopsora premnae on Premna acuminata - BRIP 60941.
Highslide JS
Telia and uredinia of Crossopsora premnae on Premna serratifolia - BRIP 52763.
Scale bar = 1 cm.
Highslide JS
Urediniospores of Crossopsora premnae on Premna acuminata - BRIP 60941.
Scale bar = 10 µm.
Highslide JS
Paraphyses and urediniospores of Crossopsora premnae on Premna serratifolia - BRIP 52763.
Scale bar = 10 µm.
Highslide JS
Teliospores of Crossopsora premnae on Premna serratifolia - BRIP 52763.
Scale bar = 10 µm.