MYRTACEAE. Eucalyptus sp.: New South Wales, near Sydney.

Hymenophore annual, membranous, adherent, appearing first as numerous small irregularly disciform colonies 2-5 mm across, which merge to form irregular areas to 8 x 2 cm; margin free, lacerate, concolorous; hymenial surface alutaceous or tan, velutinate, not creviced. Context isabelline, to 0.5 mm thick, basal layer a narrow partly cemented zone of parallel hyphae, intermediate layer of erect hyphae partly cemented and compacted, embedding masses of crystals; generative hyphae 4-5 µm diameter, walls 0.25-0.5 µm thick, naked, with clamp connections. Acanthophyses subclavate when 28-32 x 6-8 µm, clavate and 50-60 x 14-16 µm, or cylindrical when 4-6 µm diameter, bearing upon the upper half crowded digitate processes which may attain a length of 4 µm. Gloeocystidia crowded in the hymenial layer and in irregular rows through the context, pyriform, fusiform, flexuous-cylindrical, or clavate, 35-86 x 6-22 µm, walls commonly smooth, sometimes bearing a few spines on the apical region. Hymenial layer to 80 µm deep, a compact palisade of basidia, paraphyses, acanthophyses, gloeocystidia, and paraphysate hyphae. Basidia cylindrical, 55-70 x 12-16 µm, bearing 4 spores; sterigmata arcuate, stout, to 10 µm long. Paraphyses clavate, 30-40 x 7-9 µm. Paraphysate hyphae cylindrical, moniliform, sometimes branched, not or slightly projecting, to 6 µm diameter. Spores obovate, elliptical, some compressed on one side, strongly apiculate, 20-26 x 14-18 µm, walls closely aculeate, hyaline, 0.2 µm thick, amyloid, spines to 4 µm long.

DISTRIBUTION: Australia.

HABITAT: Scattered on bark of dead branches.

Specimens from which the description has been drawn match the type ex "Queensland, Buderim Mt., 1912, C. T. White, No. 4" examined in Kew herbarium. The species may be recognised by the acanthophyses of various shapes and irregular gloeocystidia which together occupy the greater part of the context and hymenium, large spores with aculeate spines, and cylindrical, sometimes branched paraphysate hyphae. Basidia collapse when spores are about two-thirds developed so that it is difficult to ascertain their size or length of the sterigmata. Gloeocystidia when fresh are conspicuous, as contents stain deeply. Acanthophyses are present both in the hymenial layer and scattered through the context.

TYPE LOCALITY: Buderim Mountains, Queensland.