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Endoraecium irroratum McTaggart & R.G. Shivas

Uredinia forming galls on stems, up to 2 cm long, yellowish brown.

Urediniospores ovoid, apex obtuse, subhyaline, yellow to yellowish brown, 32‒42 × 17‒24 μm; wall 2.0‒3.5 μm thick at sides, apex sometimes thickened (up to 4 μm), reticulate, with 4‒10 equatorial germ pores. Telia

Telia formed from uredinia, yellowish brown.

Teliospores cylindrical to subfusiform, apex acuminate to rounded, 2‒7-digitate, subhyaline to yellow, 47‒73 × 15‒22 μm; wall 1.0‒1.5 μm thick at sides, 11‒21 μm thick at apex; pedicel persistent, up to 46 μm.

Host family: Fabaceae
Host species: Acacia irrorata


Endoraecium irroratum occurs on A. irrorata in Botrycephalae. Berndt (2011) considered that the rust on A. irrorata was E. digitatum based on morphology. There are no clear morphological differences that separate E. irroratum from the epitype of E. digitatum (Berndt 2011). However, the results from a molecular phylogenetic analysis by McTaggart et al. (2015) indicate the rusts on Acacia section Botrycephalae are highly host specific.

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Endoraecium irroratum on Acacia irrorata - BRIP 55671.
Scale bar = 1 cm.
Highslide JS
Urediniospores of Endoraecium irroratum on Acacia irrorata - BRIP 55671.
Scale bar = 10 µm.
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Teliospores of Endoraecium irrorata on Acacia disparrima - BRIP 57279.
Scale bar = 10 µm.