Endoraecium disparrimum McTaggart & R.G. Shivas
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.
formed from uredinia, yellowish brown.
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.
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).