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Sphaerophragmium acaciae (Cooke) Magnus

Description
Uredinia on lower leaf surface, subepidermal, erumpent, round, up to 0.5 mm diam., scattered or in small groups, pale brown.

Urediniospores broadly ellipsoidal, reniform, obovoid or asymmetrical, yellowish brown, 21‒30 × 13‒22 µm; wall even, 1‒2 µm thick, echinulate, with 4‒5 scattered or equatorial germ pores.

Telia on lower leaf surface, circular, up to 1 mm diam., subepidermal, erumpent, dark brown to black.

Teliospores broadly ellipsoidal, 6-8 celled, reddish brown, 31‒42 × 23‒32 µm; wall 1.0-3.5 µm thick, with 4‒7 tubercules on each cell; tubercules 6‒12 µm long, tapered towards the furcate tips and 3‒5 µm wide at base.

Hosts
Host family: Fabaceae
Host species: Albizia lebbeck
Albizia procera

Distribution
NT, QLD

Comments
Sphaerophragmium acaciae was reported in Australia by Simmonds (1966). Alcorn and Walker (1996) considered that S. acaciae had been introduced to Australia.

Highslide JS
Sphaerophragmium acaciae on Albizia sp. - BRIP 60296.
Highslide JS
Uredinia and telia of Sphaerophragmium acaciae on Albizia lebbeck - BRIP 47333.
Scale bar = 5 mm.
Highslide JS
Urediniospores of Sphaerophragmium acaciae on Albizia lebbeck - BRIP 47333.
Scale bar = 10 µm.
Highslide JS
Teliospores of Sphaerophragmium acaciae on Albizia sp. - BRIP 54621.
Scale bar = 10 µm.