Colonies form a sparse, black growth composed of phialophores and capitate hyphae. Mycelium immersed, composed of pale brown to brown, branched, septate hyphae 2.5-3.5 µm wide. Round the bases of phialophores are found dark brawn cells in the form of small stromata, and hyphae radiate from these into the substratum. Capitate hyphae are solitary and scattered or more usually they accompany the phialophores ; they are simple, mostly straight, erect, brown to dark brawn below, pale brown to subhyaline toward the apex, 2-4-septate, 60-170 µm long, slightly swollen at the base, then 7 µm wide and tapering gradually to 4-5 µm just below the barely swollen apex, which bears a hyaline cap of (?)mucilage. They may have one or rarely two intercalary swellings.

Phialophores are scattered, usually solitary, sometimes in tufts of 2 to 6; they are simple, mostly straight, erect, dark brown below, pale brown toward the apex, 3-6-septate, 200-330 µm long, with a basal swelling 13-17 µm wide; above the swelling they are more or less cylindrical and 8-10 µm wide. The apical cell is a cylindrical phialide provided with a more or less cuneate, pale brown collarette 19-40 µm long and 25-28 µm wide at the distal end where the wall is very thin and irregularly frayed. Phialides may proliferate through the. collarette to produce a series of up to 5 phialides.
Phialospores develop singly and successively within the collarette to form a chain of up to seven, or to form a cluster round the collarette. Mature phialospores are continuous, smooth, more or less narrowly and rounded-¬obconic, truncate at the basal scar, usually rounded at the apex. When viewed from above the phialospores are seen to be angular with 2 or 3, usually 3, blunt corners. 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 4 µm), 27-45 µm long, 16-8-24 µm wide at the distal end and 7 to 10 µm wide at the flattened base. Occasionally a phialospore is rounded at the distal end with a solitary, circular, thin¬-walled area at the apex.

Coloniae effusae, atrae, ex phialophoribus et hyphis capitatis compositae. Mycelium immersum, ex hyphis pallide brunneis vel brunneis, 2.5-3.5 µm lat. compositum. Hyphae capitatae 2-4-septatae, 60-170 µm long., basi brunneae vel atrobrunneae, 7 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 6 in floccis aggregata, simplicia, recta, basi atrobrunnea, apicem versus pallidiore, 3-6-septata, plus minusve cylindrica, 8-10 µm lat., dein in phialidam cylindricam terminata. Strophium cuneato-infundibuliforme, conspicuum, 19-40 µm alt., 25-28 µm lat. Proliferat phiala per strophium et phialam novam gerat; ita series linearis phialidarum usque ad 5 nata. Phialospora brunnea vel atrobrunnea, rotundato-obconica, basi truncata, apice plerumque 3-angulata, 27-45 µm long., 16.8-24 µm lat., sive catenulata sive circa strophium aggregata.

Typus in ligno putrido, New Zealand, Auckland Province, Walker Bush, Henderson Valley, Waitakere Ranges, 30.I.1963, PDD 20523 (DAOM 93562).;