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Endoraecium auriculiforme McTaggart & R.G. Shivas

Description
Uredinia on both phyllode surfaces, subepidermal, erumpent, on bullate swellings up to 1 cm long, or pulverulent on phyllode surface, linear to round, yellowish brown; paraphyses intrasoral, cylindrical, apex 6‒9-digitate, subhyaline to yellow, 35‒70 × 10‒14 μm, thickened at apex, pedicel up to 40 μm.

Urediniospores obovoid, oval to fusiform, apex acute, yellowish brown, 31‒46 × 16‒20 μm; wall 3‒5 μm thick at sides and 5‒9 μm thick at apex, foveolate, with 3‒4 equatorial germ pores; pedicel 3‒5 μm, or absent.

Telia formed from uredinia, erumpent, reddish brown

Teliospores cylindrical to fusiform, apex rounded, 2‒4-digitate, hyaline to subhyaline, 36‒54 × 13‒25 μm; wall 1.5‒2.5 μm thick at sides, 6‒8 μm thick at apex; pedicel persistent, up to 38 μm.

Basidia cylindrical, 3-septate, up to 35‒40 × 8‒12 μm.

Basidiospores globose, hyaline, 4‒6 μm, smooth-walled.

Hosts
Host family: Fabaceae
Host species: Acacia auriculiformis

Distribution
NT

Comments
Endoraecium auriculiforme has foveolate urediniospores with an acute and thickened apex, and digitate paraphyses that resemble narrow teliospores. Endoraecium violae-faustiae and E. peggii also produce similar paraphyses. These three species all occur on hosts in the Juliflorae, with E. auriculiforme restricted to A. auriculiformis; E. violae-faustiae to A. aulacocarpa and A. crassicarpa, and E. peggii to A. holosericea.

Highslide JS
Endoraecium auriculiforme on Acacia auriculiformis - BRIP 56550.
Scale bar = 1 cm.
Highslide JS
Urediniospores of Endoraecium auriculiforme on Acacia auriculiformis - BRIP 55609.
Scale bar = 10 µm.
Highslide JS
Teliospores of Endoraecium auriculiforme on Acacia auriculiformis - BRIP 56550.
Scale bar = 10 µm.