Hymenophore effused, to 15 x 8 cm., 5-10 mm. thick, firm, dry and woody, at first white, drying cream or pallid yellow, sometimes tinted orange; surface even, not toothed, slightly glancing; margin tapering, irregular, concolorous, from 1 mm. to 10 mm. wide, byssoid. Pores obscurely stratose in old specimens, cream in section, round, to 8 mm. deep, 75-100 µ diameter, or 7-9 to mm.; dissepiments 30-100 µ thick, commonly 50 µ, apices acuminate, even or slightly velutinate. Context white, to 1 mm. thick, often 200 µ or less in old plants, hyphae loosely woven, not cemented, similarly arranged in dissepiments, crystals few and scattered; skeletal hyphae 2.5-5 µ thick, lumen 1 µ, hyaline, not staining, aseptate, sparsely branched; generative hyphae to 1.5 µ thick, delicate walled, branched, septate, contents staining, clamp connections present, scanty. Basidial type clavate, basidia elliptical or clavate, staining, 4-6 x 2-3 µ, soon collapsing. Spores allantoid, appreciably curved, 2.5-3 x 0.75-1 µ, smooth, hyaline.

Differentiated by the firm, dry, woody texture and light colour of the hymenophore, small pores with thin dissepiments, sparingly branched aseptate skeletal hyphae, and allantoid small spores. It somewhat resembles P.subacida Peck, but differs in the smaller pores, cream colour, spores (those of P.subacida being ovate, 3-4.5 x 3-4 µ), absence of cystidia and aseptate skeletal hyphae.

ARAUCARIACEAE. Agathis australis: Auckland, Albany, 130 m; Anawhata Road, Waitakere Ranges, 300 m; Huia, 100 m; Camel's Back, Coromandel Peninsula, 200 m. LAURACEAE. Beilschmiedia tawa: Auckland, Mt. Te Aroha, 500 in; Upper Wairoa Valley, Hunua Ranges, 300 m, type collection, P.D.D., Herbarium, No. 5279. MYRSINACEAE. Myrsine salicina: Auckland, Anawhata Road, Waitakere Ranges, 300 m. MYRTACEAE. Metrosideros robusta: Auckland, Upper Piha Valley, 300 m; Cutty Grass Road, Waitakere Ranges, 300 m. PODOCARPACEAE. Dacrydium cupressinum: Auckland, Kauri Grove Track, Waitakere Ranges, 280 m. Podocarpus totara: Auckland, Piha, 120 m; Hunua Ranges, 280 m. UNKNOWN HOSTS. Auckland, Little Barrier Island, 70 m; Mangatangi Valley, Hunua Ranges, 170 m; Clevedon, 30 m.

Hymenophore annual or perennial, adherent, coriaceous, effused forming irregular areas 8-15 x 4-8 cm, 5-10 mm thick. Hymenial surface at first white, drying cream or pallid yellow, sometimes tinted orange, not creviced, even; margin thinning out, irregular,. concolorous, 1-10 mm wide, fibrillose, adherent. Pores obscurely stratose in old specimens, slightly glancing, round, 7-9 per mm, 75-100 µm diameter, to 8 mm deep; dissepiments entire, 30-100 µm thick, commonly 50 µm, acuminate, even or slightly velutinate. Context white, to 1 mm thick, 200 µm or less in old plants, of densely intertwined hyphae, embedding a few scattered crystals; skeletal hyphae 2.5-5 µm diameter, walls 1-1.5 µm thick, aseptate, sparsely branched, naked; generative hyphae 1-1.5 µm diameter, walls 0.1 µm thick, branched, septate, with scanty clamp connections. Hymenial layer to 10 µm; deep, a scanty palisade of basidia and paraphyses. Basidia elliptical, or subclavate, 4-6 x 2-4 µm, soon collapsing, bearing 4 spores; sterigmata erect, slender, to 4 µm long. Paraphyses obovate, cylindrical, or a few subclavate, 4-6 x 2-3 µm. Spores allantoid or sublunate, 2.5-3 x 0.75-1 µm, walls smooth, hyaline, 0.1 µm thick.

DISTRIBUTION: New Zealand.

HABITAT: Decorticated decayed fallen branches and trunks, associated with a white rot.

Characterised by the firm and dry coriaceous texture, light colour, small pores with thin dissepiments, obscurely stratose in old specimens, sparsely branched aseptate skeletal hyphae, delicate generative hyphae, and allantoid spores of small size. Most collections are sterile, save near margins, and even in fertile plants basidia are scattered and inconspicuous.
The species illustrates the weakness of trying to establish a genus such as Perenniporia upon the presence of stratose pores. In different specimens pores may be in a single layer, of several seasons' growth but continuous, or show definite strata indicated by slight changes in shape or colour.

TYPE LOCALITY: Hunua Ranges, Auckland.