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Endoraecium falciforme McTaggart & R.G. Shivas

Description
Spermogonia on fruit or phyllodes, amphigenous, subepidermal, erumpent, c. 100 μm. Uredinia

Uredinia on fruit or on both phyllode surfaces, causing distortion, surrounding spermogonia, subepidermal, erumpent, pulverulent, linear, round to ellipsoidal, greater than 10 mm, reddish brown.

Urediniospores ellipsoidal to ovoid, subhyaline to yellow, 34‒43 × 21‒25 μm; wall unevenly thickened at equator, 3.0‒6.5 μm and 3‒5 μm thick at apex, reticulate, with 4‒9 equatorial germ pores; pedicel 2 μm.

Telia on both phyllode surfaces, formed separately from uredinia, erumpent, c. 1 mm, orange to yellowish brown.

Teliospores cylindrical to clavate, apex rounded, 2‒5-digitate, subhyaline, 47‒63 × (13‒)15‒23 μm; wall 1.5‒2.0 μm thick at sides, 12‒24 μm thick at apex; pedicel persistent, up to 64 μm long × 6‒8 μm thick.

Hosts
Host family: Fabaceae
Host species: Acacia falciformis

Distribution
NSW, QLD

Comments
Endoraecium falciforme is morphologically similar to E. walkerianum, which both occur on species of Acacia in Botrycephalae. Endoraecium falciforme has distinctively thicker walls at the equator of the urediniospores (3.0‒6.5 μm) than E. walkerianum (3.0‒4.5 μm). Endoraecium falciforme is recorded from south-east Queensland, whereas E. walkerianum is known from southern Australia. Urediniospores from a paratype specimen of E. walkerianum (BRIP 14205) were found to have thickened apices, whereas those of E. falciforme were thickened at the equator, or the wall was of uniform thickness (McTaggart et al., 2015).

Highslide JS
Endoraecium falciforme on Acacia falciformis - BRIP 57583.
Highslide JS
Endoraecium falciforme on Acacia falciformis - BRIP 57583.
Scale bar = 1 cm.
Highslide JS
Urediniospores of Endoraecium falciforme on Acacia falciformis - BRIP 57583.
Scale bar = 10 µm.
Highslide JS
Teliospores of Endoraecium falciforme on Acacia falciformis - BRIP 57583.
Scale bar = 10 µm.