Endoraecium hyalosporum (Sawada) M. Scholler & Aime

Description
Uredinia on both phyllode surfaces, subepidermal on bullate swellings, round to ellipsoidal, bullate swellings up to 2 mm covered by uredinia, yellowish brown.

Urediniospores ellipsoidal, obovoid to oval, apex acute, reddish brown to brown, 36-55 × 18-27 µm; wall 2-3.5 µm thick at sides, apex slightly thickened, apex 3-5 µm thick, foveolate, with 4-6 equatorial germ pores present.

Telia on both phyllode surfaces with uredinia on bullate swellings, dome-shaped, brown.

Teliospores cylindrical, ovoid to oval, apex rounded, hyaline to subhyaline, 44-54 × 20-27 µm; wall 2-2.5 µm thick, smooth, with persistent pedicel, up to 70 µm.

Basidiospores globose, hyaline, 10-13 µm diameter.

Specimens cited in description:
- BRIP 64607

Hosts
Host family:
- Fabaceae

Host species:
- Acacia confusa

Distribution
China, Taiwan

Comments
McTaggart et al. (2015) determined the species of Endoraecium on Acacia subgenus Plurinerves formed a monophyletic group. Endoraecium hyalosporum may be closely related to rusts on these hosts, such as species of Endoraecium on Acacia koa in Hawaii.