Colonies form a sparse, tufted or velutinous, black growth of phialophores, capitate hyphae, and sometimes perithecia. Mycelium immersed, composed of pale brown to brown, branched, septate hyphae 2.5-3.5 µm, wide. Round the bases of solitary phialophores are found dark brown cells in the form of.small stromata, and hyphae radiate from these into the substratum. Tufts of phialophores, usually mixed with capitate hyphae, arise from larger flattened stromata up to 70 µm wide. Capitate hyphae are solitary and scattered or more usually they accompany tufts of phialophores ; they are simple, mostly straight, erect, brown to dark brown below, pale brown to subhyaline toward the apex, 3-5-septate, 100-200 µm long, slightly swollen (up to 10 µm) at the base, then 7-8.5 µm wide and tapering gradually to 3-4 µm just below the slightly swollen apex which bears a hyaline cap of (?)mucilage. Phialophores are scattered and solitary or in tufts of up to 12; they are simple, straight or flexuous, erect, brown to dark brown below, usually pale brawn toward the apex but sometimes dark brown, 1-7-septate, 50-330 µm long, with a basal swelling up to 14 µm wide; above the swelling phialophores are 6.5-11.5 µm wide tapering gradually toward the apex which is 5.6-7.5 µm wide. The apical cell is a cylindrical phialide provided with a funnel-shaped, pale brown to dark brown collarette, 2.8-5.6 µm deep and 10.3-11.3 µm wide at the distal end, with an entire but later a slightly ragged margin. Phialides may proliferate through the collarette to produce a series of up to five phialides. Phialospores develop singly and successively within the collarette to form either a chain of up to eight, which readily secedes, or to form a cluster round the collarette. Mature phialospores are continuous, smooth, rounded-obconic, truncate at the basal scar, rounded or flattened at the apex. When viewed from above they have the appearance of a square or pentagon with blunt or occasionally acute corners and slightly concave sides.
At each corner is seen a small, circular, thin, and pale area of cell wall which presumably functions as a germ pore. Phialospores are brown to dark brown, thick-walled (up to 2.3 µm), 12.6-17.5 µm long, 11.4-18.2 µm wide at the distal end and 3.3-4.8 µm wide at the flattened base.
Perithecia are superficial, solitary or in groups of 2 to 6 growing amongst phialophores and capitate hyphae. They are globose with a short ostiolar papilla, black, 150-220 µm, in diameter with a wall 15-22 µm thick, bearing 10 to 20 radiating and usually upwardly bent capitate hyphae; rarely 1 or 2 phialophores have been seen growing out from the perithecial wall.
Asci are unitunicate with a non-amyloid annulus near the apex, cylindrical-clavate, 8-spored, subsessile, 80-100 x 9-10.8 µm. Ascospores are distichous, ellipsoidal, and slightly curved, hyaline, finally 3-septate, 20-24 x 4.5-5.4 µm.

Coloniae effusae, atrae, ex phialophoribus et hyphis capitatis atque interdum peritheciis compositae. Mycelium immersum ex hyphis pallide brunneis vel brunneis, 2.5-3.5 µm lat. compositum. Hyphae capitatae 3-5 septatae, 100-200 µm long., basi brunneae vel atrobrunneae, 7-8.5 µm lat., apicem versus pallide brunneae vel subhyalinae, ad 3-4 µm attenuatae, dein in capitem paullum inflatum, interdum tunica (?)mucosa, praeditum. Phialophora solitaria vel ad 12 in floccis aggregata, simplicia, recta vel flexuosa, brunnea vet atrobrunnea, 1-7-septata, 6.5-11.5 µm lat., apicem versus 5.6-7.5 µm attenuata, dein in phialidam cylindricam terminata. Strophium infundibuliforme, 2.8-5.6 µm alt., 10.3-11.3 µm lat. Proliferat phiala per strophium et phialam novam gerat; ita series linearis phialidarum usque ad 5 nata. Phialospora brunnea, rotundato-obconica, basi truncata, apice 4-5-angulata, 12.6-17.5 µm long., 11.4-18.2 µm lat., sive catenulata sive circa strophium aggregata. Perithecia superficialia, solitaria vel 2-6 aggregata, globosa, papillata, 150-220 µm diam., hyphis capitatis 10-20, rare phialophoribusque 1 vel 2, radiantibus in parietam insertis praedita; paries 15-22 µm crassus. Asci unitunicati, cylindraceo-clavati, octospori, subsessiles, 80-100 x 9-10-8 µm. Ascosporae distichae, ellipsoideae, curvatae, hyaline, 3-septatae, 20-24 x 4.5-5.4 µm.

Habitat in ligno putrido Coprosmae lucidae, Coprosmae spp., Freycinetiae banksii, Griseliniae lucidae, Leptospermi ericoidis, Metrosideros robustae, Neopanacis arborei, Oleariae rani, Weinmanniae racemosae, nec non in ligno putrido planta ignota.

Typus in ligno putrido Metrosideros robustae, New Zealand, Auckland Province, Upper Piha Valley, Waitakere Ranges, 9.X.1963, leg. J. M. Dingley, PDD 21603 (DAOM 93575).