Habitat. Effused on decorticated decaying wood, or fern stipes. Cyathea dealbata (Forst. f.) Swartz. Auckland: Waikaretu, 400ft., October, 1946, E. E. Chamberlain. Unknown Host. Wellington: Ruahine Ranges, October, 1946, A. P. Druce. Confusion exists in literature as to whether the species should be placed under Corticium or Tomentella. Because spores are hyaline and the hymenium is frequently in the form of a definite palisade, it has been placed under Corticium herein. The collection from Ruahine Ranges exhibits the Tomentella-type structure, that from Waikaretu the Corticium form seen in many European collections at Kew. The species may be separated from C. tulasnelloideum by the different shape of the echinulate spores, conspicuous yellow colour of the surface and usually presence of rhizomorphs either in the context or at the periphery. Colour sometimes fades from the central portions, but remains in the marginal region An extensive synonymy is given by Rogers & Jackson (1943, 308) together with a discussion as to the specific name to be employed for this species. 18 Corticium tulasnelloideum Hoehnel & Litschauer, Sitzgb. K. Akad. d Wiss.-Wien, Math.-Nat. Kl. 117, 1118, 1908. Text-figs. 16, 16b. Corticium incanum Burt, Ann Missouri Bot. Gard., 13, 205, 1926. Hypochnus tulasnelloideum (H. & L.) Rea, Trans. British Myc. Soc, 12, 222. 1927. Hymenophore annual, closely adnate, arachnoid, effused, forming irregular areas to 5 × 3 cm.; surface at first clingy white, becoming grey or bluish-grey, irregularly granular, not creviced; margin thinning out, arachnoid, white, adnate Context white, 10–100μ thick, commonly 10–20μ, composed of a narrow base of densely arranged parallel hyphae; generative hyphae 3–3.5μ diameter, wall 0.2μ thick, sometimes inflated between septa, naked, hyaline, branched, septate, with clamp connections Hymenial layer to 30μ deep, of basidia and paraphyses Basidia subclavate or subcylindrical, 8–16 × 4–6μ, 4-spored; sterigmata slender, to 7μ long. Paraphyses subclavate. smaller than the basidia. Spores globose, subglobose, or obovate, 4.5–5.5 × 4–4.5μ, wall finely distinctly echinulate. hyaline 0.5μ thick. Type Locality. Germany. Distribution Europe, Great Britain, North America, New Zealand. Habitat. Effused on bark or decorticated dead wood. Agathis australis Salisb. Auckland: Piha Valley, August, 1953, J. M. Dingley. Beilschmiedia tawa. (A. Cunn.) Hook. f. & Benth: Auckland: Titirang, Waitakeres, 1,000ft., July, 1951, J. M. Dingley, Hick's Bay. 300ft, May, 1952, G. H. C. Cupressus macrocarpa Hartn: Auckland: Campbell's Bay, November, 1946, Mrs E. E. Chamberlain. Dacrydium cupressinum Sol Wellington Ohakune, 2,000ft, December, 1953, J. M. Dingley. Fuchsia excorticata L.f. Auckland: Lake Okatama, 1,500ft, June, 1951, J. M. Dingley. Nothopanax arboreum (Forst. f.) Seem Taranaki: Mt Egmont, 3,000ft March, 1951, J. M. Dingley, same locality. February, 1952, G. H. C, January, 1953, J. M. Dingley. Oxylobium sp. Auckland: Campbell's Bay, November, 1946, Mrs. E. E. Chamberlain.