Type: Radicicolous Fungi; Description: Basidiomata resupinate, widely effused, adnate, up to 9 mm thick, hard when dry. Pore surface pale ochraceous buff to pinkish ochraceous; pores 6–12 per mm. Pore layer more or less stratified, up to 1 mm thick in each stratum, margin whitish to cream, velutinate to glabrous, narrow. Context brown, fibrous, up to 0.5 mm thick with a thin, horny, basal layer. Hyphal system apparently dimitic. Cystidia abundant, apically heavily encrusted, 20–70 × 10–24 μm. Basidiospores ovoid to subglobose, 4–6 μm, hyaline.

Distribution: Auckland, Bay of Plenty, Taupo, Wanganui, Gisborne, Hawkes Bay, Marlborough Sounds, Dunedin.; 1st Record: Colenso (1887: as Poria vincta).

Significance: The cause of low-level mortality (about 1%) in Pinus radiata plantations in the Bay of Plenty, predominantly on sites previously covered by indigenous forest (Hood & Dick 1988). The fungus is associated with root disease in other coniferous hosts and has been isolated from orchard shelterbelt trees suffering from ‘white crown canker’. It has been shown to be pathogenic to seedlings of Chamaecyparis lawsoniana, Cryptomeria japonica, Cupressus macrocarpa, Eucalyptus regnans, Pinus radiata, Salix matsudana, and Thuja plicata (Hood & Dick 1988).; Host(s): Parasitic attack: Berberis glaucocarpa, Chamaecyparis lawsoniana, Cryptomeria japonica, Cupressus macrocarpa, Eucalyptus regnans, Pinus radiata, Salix matsudana, Thuja plicata. Nature of attack not known: Acacia melanoxylon, Acmena smithii, Beilschmiedia tawa, Betula pendula, Corynocarpus laevigatus, ×Cupressocyparis leylandii, Cupressus sempervirens, C. torulosa, Dysoxylum spectabile, Eucalyptus botryoides, E. fraxinoides, E. johnstonii, E. saligna, Hoheria populnea, Nothofagus menziesii, Paraserianthes lophantha, Phebalium squameum, Pittosporum tenuifolium, Plagianthus regius, Populus nigra, Syncarpia glomulifera.

The name Rigidoporus vinctus has been interpreted confusingly in the literature and herbaria, and we know from our own experience that it covers many species. Part of the material under this name belongs to Meripilaceae, and part of it to Lividopora.