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Endoraecium disparrimum McTaggart & R.G. Shivas

Description
Uredinia on both phyllode surfaces, forming bullate swellings up to 1 cm long, or pulverulent, linear to round, up to 1 mm diam, yellowish brown.

Urediniospores subglobose to ovoid, apex obtuse, yellowish brown, 29‒41 × 20‒26 μm; wall 2‒4 μm thick at sides and 5.5‒9.0 μm thick at apex, reticulate with 2‒5 equatorial germ pores; pedicel 2 μm or absent.

Telia formed from uredinia, yellowish brown.

Teliospores cylindrical to fusiform, apex acuminate to rounded, hyaline to subhyaline, 31‒50 × 20‒26 μm; wall 1‒2 μm thick at sides, 4‒14 μm thick at apex; pedicel persistent, up to 33 μm.

Hosts
Host family: Fabaceae
Host species: Acacia disparrima

Distribution
QLD

Comments
Endoraecium disparrimum occurs on A. disparrima in Juliflorae. It was recovered as sister to E. violae-faustiae, which occurs on closely related species of Acacia. It differs from E. violae-faustiae in that the urediniospores have an obtuse apex with reticulate rather than foveolate ornamentation, and paraphyses are absent (McTaggart et al., 2015).

Highslide JS
Endoraecium disparrimum on Acacia disparrima - BRIP 55659.
Scale bar = 1 cm.
Highslide JS
Urediniospores of Endoraecium disparrimum on Acacia disparrima - BRIP 55659.
Scale bar = 10 µm.
Highslide JS
Teliospores of Endoraecium disparrimum on Acacia disparrima - BRIP 55626.
Scale bar = 10 µm.