On dead stipes of (1) Cyathea medullaris, Auckland, Lake Rotoehu, Dee 1953, G. H. Cunningham, 24647; (2) Dicksonia squarrosa, Lake Rotoehu, 13 Dee 1953, G. H. C., (HOLOTYPE, PDD 24646).

Fructifications resupinate, thin, effused, indeterminate, forming irregular areas to 12 cm in longest dimension, pruinose, dingy white to pallid cream when fresh, changing little on drying; margins concolorous, adnate. In section to 40 µm thick, consisting of basal layer and hymenium. Basal layer thin, composed of sparse, indistinct, nodulose hyphae of irregular diameter, clamp connections present. Hymenium composed of dikaryophyses and basidia; dikaryophyses sparse, irregularly branched apically, indistinct; probasidia clavate at first, becoming subglobose to globose, with obscure basal clamp connections, 7.5-9.5 µm diam., becoming longitudinally cruciate-septate; sterigmata cylindrical, occasionally expanded apically, to 17 x 2-2.5 µm. Basidiospores curved-cylindrical to allantoid, hyaline, apiculate, 7.5-10-(11.5) x 2.8-4 µm. Germination by repetition.

Dead fern stipes.

Fructificationes resupinatae, tenues, effusae, indeterminatae, pruinosae, sordide albae ad pallide luteas; margines concolores, adnatae; ordo basalis tenuis, factus ex hyphis sparsis, indistinctis, diametri irregularis, nodosis. Dikaryophyses sparsae, ad apicem irregulariter ramosae, indistinctae: probasidia subglobosa ad globosa, 7.5-9.5 µm diam., per longitudinem cruciata-septata; sterigmata cylindrica, ad 17 X 2-2.5 µm. Basidiosporae curvo-cylindricae ad allantoeides, hyalinae, apiculatae, 7.5-10-(11.5) x 2.8-4 µm. Per repetitionem germinantes.

Fructifications of Sebacina filicola are too thin to permit accurate determination of the texture, but they appear to be arid-waxy rather than gelatinous.
The simple structure of fructifications and the allantoid spores suggest that this species is perhaps closely related to S. fugacissima Bourd. & Galz. It may be distinguished by the larger, subglobose to globose basidia and longer spores.

Typus Auckland Province, Lake Rotoehu, 13 Dee 1953, G. H. Cunningham, PDD 24646.