On dead stipe of (1) Pteridium aquilinum var. esculentum. Wellington, Pohangina Reserve. 21 Aug 1954, G. H. Cunningham, (HOLOTYPE, PDD 24648).

Fructifications arid-waxy, resupinate, thin, effused, indeterminate, originating as small, discrete patches, coalescing to form irregular areas to 5 cm in longest dimension, pruinose, dingy white to greyish white when fresh, changing little on drying; margins concolorous. adnate. In section to 150 µm thick, consisting of basal layer and hymenium. Basal layer thin, composed of indistinct, thin-walled, nodulose hyphae of irregular diameter, clamp connections present. Hymenium composed of dikaryophyses and basidia; dikaryophyses abundant, irregularly branched apically, indistinct, probasidia broadly elliptical to obovate, with basal clamp connections, formed in terminal groups on fertile hyphae, 11.8-15.5-(18.5) x 10.5-15 µm, becoming 2-celled by longitudinal septa or longitudinally cruciate-septate; sterigmata cylindrical, to 20 x 3-4 µm. Basidiospores curved-cylindrical, hyaline, apiculate. 10.5-15.5-(18.5) x 5-7-(9) µm. Germination by repetition.

Dead fern stipes.

Fructificationes aride ceraceae, resupinatae, tenues, effusae, indeterminatae, pruinosae, sordide albae ad albidas; margines concolores, adnatae; ordo basalis tenuis, factus ex hyphis indistinctis, tenuiparietibus, diametri irregularis, nodosis. Dikaryophyses permultae, ad apicem irregulariter ramosae, indistinctae; probasidia late elliptica ad obovata, formata in globos terminates in hyphis fertilibus, 11.8-15.5-(18.5) x 10.5-15 µm, 2-cellulata vel per longitudinem cruciata-septata; sterigmata cylindrica, ad 20 x 3-4 µm. Basidiosporae curvo-cylindricae, hyalinae, apiculatae, 10.5-15.5-(18.5) x 5-7-(9) µm. Per repetitionem germinantes.
Habitat in stipitibus mortuis Pteridii aquilini var. esculenti.

Sebacina pteridicola resembles S. filicola in colour and habitat, but may be distinguished by the larger basidia and spores.

Typus Wellington Province, Pohangina Reserve, 21 Aug 1954, G. H. Cunningham, PDD 24648.