Polyporus hyalinus Berk., Fl. Tasm. 2: 255, 1860.

Hymenophore annual, adherent, membranous, forming irregularly linear areas 4-10 x 2-4 cm, 0.1-3 mm thick. Hymenial surface at first white, becoming cream or honey yellow with a glassy appearance, even, often creviced; margin adherent, thinning out when sterile, or in some specimens terminating abruptly in a fertile face, arachnoid, irregular. Pores not in strata, round or angular, often oblique, 6-9 per mm (6-7 when young), 100-200 µm diameter, to 2.5 mm deep; dissepiments 50-75 µm thick, not toothed, even, equal. Context white, 100-200 µm thick, a densely intertwined layer of hyphae embedding numerous crystals; generative hyphae 2-2.5 µm diameter, walls 0.2 µm thick, branched, septate, with abundant clamp connections, embedded in mucilage. Hymenial layer to 15 µm deep, a dense palisade of basidia and paraphyses embedded in mucilage. Basidia clavate, 8-12 x 3-4 µm bearing 4 spores; sterigmata erect, delicate, to 3 µm long. Paraphyses ovate, oval, or clavate, 6-10 x 3-3.5 µm, Spores allantoid, 3-4 x 0.75-1 µm walls smooth, hyaline, 0.1 µm thick.

TYPE LOCALITY: Tasmania.
DISTRIBUTION: Australia, Tasmania, New Zealand.

New Zealand isolates were characterised by PCR diagnostic tests and identified the Ralstonia solanacerum (Biovar 2 race 3). DNA sequencing further characterised these isolates as Phylotype 2B Sequevar 1. The revised taxonomy means that the Ralstonia solanacerum species are now limited to Phylotype 2 strains, and that Ralstonia pseudosolanacearum is not present in New Zealand [RT & BSW 2018].