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Endoraecium tropicum McTaggart & R.G. Shivas

Uredinia on both phyllode surfaces, subepidermal, pulverulent, up to 2 mm, brown.

Urediniospores ovoid to fusiform, apex obtuse, yellowish brown, 30‒40 × 17‒22 μm; wall 3‒4 μm thick at sides, apex usually 3‒4 μm thick, sometimes slightly thickened (4‒5 μm), reticulate, with 3‒4, equatorial germ pores; pedicel 3‒4 μm.

Telia formed from uredinia, erumpent.

Teliospores clavate, apex rounded, papillate rather than digitate, 40‒53 × 16‒23 μm; wall 1.5‒2.0 μm thick at sides, 8‒11 μm thick at apex; pedicel persistent, 5 μm.

Host family: Fabaceae
Host species: Acacia tropica


Endoraecium tropicum was closely related to E. parvum in phylogenetic analysis by McTaggart et al. (2015). Both species have urediniospores with uniformly thickened spore walls. The distribution of A. tropica is restricted to the Northern Territory and north-west Queensland. Acacia leiocalyx, the host of E. parvum, occurs in eastern Australia (Maslin 2013).

Highslide JS
Endoraecium tropicum on Acacia tropica - BRIP 56557.
Scale bar = 1 cm.
Highslide JS
Urediniospores of Endoraecium tropicum on Acacia tropica - BRIP 56557.
Scale bar = 10 µm.
Highslide JS
Teliospores of Endoraecium tropicum on Acacia tropica - BRIP 56555.
Scale bar = 10 µm.