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Hamaspora acutissima P. Syd. & Syd.

Description
Uredinia on lower leaf surface, subepidermal, erumpent, round, up to 0.5 mm, white, peridium present, paraphyses intrasoral, cylindrical, hyaline, 63‒84 × 12‒15 µm; wall 1 µm thick, thickened at apex thickened at nape of apex up to 3 µm.

Urediniospores globose, subglobose or obovoid, apex obtuse, hyaline, 22‒25 × 18‒22 µm; wall 1.5-2 µm thick, echinulate.

Telia on stems and both leaf surfaces, subepidermal, erumpent, in long filaments, up to 2000 µm long, white, yellow or orange.

Teliospores fusiform, apex acuminate, 3‒6 celled, subhyaline with yellow contents when fresh, 95‒202 × 17‒20 µm; wall 1.5‒3 µm thick at sides, 14‒25 µm thick at apex, smooth, single or in filaments, persistent pedicel over 0.5 mm.

Basidia cylindrical, hyaline.

Hosts
Host family: Rosaceae
Host species: Rubus alceifolius
Rubus australis
Rubus hilii
Rubus moluccanus

Distribution
NSW, QLD, VIC

Comments
This rust was first identified in Australia as Phragmidium longissimum (McAlpine 1906) and subsequently as Hamaspora acutissima (Herbert and Langdon 1941). Australian specimens of Hamaspora acutissima were recovered as a monophyletic group in the Phragmidiaceae, sister to Gerwasia rubi on Rubus spp., in a molecular phylogenetic analysis with the 28S region of ribosomal DNA (unpublished).