Specimen examined: New Zealand: North Island, Auckland, Waitemata City, Waitakere Ranges, Huia, Parau Track, on wood of Metrosideros robusta, 23 Oct. 1980, Samuels (80-157) & Johnston (PDD 41422, IMI 297575).

Anamorph: Fusarium cf. melanochlorum (Casp.) Sacc., Syll. Fung. 4: 725 (1886). Fusisporium melanochlorum Casp., Sitzb. Preuss. Akad. Wiss. Physik. Math. Kl.: 309 (1855).
Perithecia pyriform, ca 200 µm high, 180-240 µm wide, with a rounded apex, collapsing laterally or not collapsing when dry, orange, red in 3% KOH, yellow in lactic acid, smooth, with an apical fringe of hyphal hairs, solitary or gregarious in groups of <20, partially to completely immersed in the substratum with papilla protruding. Cells at surface of perithecial wall forming textura angularis to epidermoidea, walls unevenly thickened, adjacent cells joined by conspicuous, fine pores. Perithecial wall 15-20 µm wide, cells with flattened to elliptic lumina 7-15 µm long, ca 3 µm wide, walls ca 1.5 µm thick. Asci cylindrical, 76-88 x 5-9 µm, 8-spored, apex with a refractive ring. Ascospores broadly ellipsoidal, (12-)13-16.3(-17) x (5.5-)5.8-7.4(-8) µm, equally 2-celled, not constricted at the septum, colourless, becoming yellow-brown, verruculose to verrucose, uniseriate.
Colonies grown 2 wk at 20°C, 12 h near UV light + cool white fluorescent light/ 12 h darkness on PSA, 3.5-4 cm diam, yellow becoming olivaceous, yellow-green pigment spreading into the agar, aerial mycelium lacking, colony surface slimy, reverse dark. Conidiophores macronematous, pionnotal or mononematous and arising along the length of repent hyphae, unbranched and monophialidic, or infrequently branched, each branch bearing a single phialide, septate once at base, 20-40 p,m long, 2-3 µm at base, 1.5 µm at tip of phialide; less frequently monophialidic conidiophores arising along the length of acute, hyphal, rope-like strands arising in the centre of the colony and producing microconidia. Microconidia ellipsoidal, sometimes asymmetric, 7-11(-13) x 2-3 µm, unicellular, with a protuberant, flat basal abscission scar, colourless. Macroconidia straight or slightly curved, sometimes more strongly curved at the tip, (1-)3-5-septate. 1,2-septate: 14-25 x 3-4 µm; 3-septate: (31-)33.8-42.2(-45) x (3.5-)3.7-4.8(-5) µm; 4,5-septate: 38.5-53(-62) x 3.5-4.8(-5.5) µm. Chlamydospores not observed.

Distribution: New Zealand (North Island).

Substrata: Associated with other fungi including Nectria cf. discophora and a pyrenomycete with black perithecia on Rhopalostylis sapida and Metrosideros robusta.

Perithecia partim in substrato immersa, pyriformia, ca 200 µm alta, 180-240 µm lata, in sicco aurantiaca, in KOH rubra, apice filis hyphalibus fimbriata. Asci cylindrici, 76-88 x 5-9 µm, apice annulo refractili provisi. Ascosporae late ellipsoideae, (12-)13-16.3-(17) x (5.5-)5.8-7.4(-8) µm, verruculosae vel verrucosae, serius flavo-brunneae, 2-cellulares, septo mediano.

Notes: Unfortunately the cultures of N. pseudoflavoviridis are no longer viable. We did not find an anamorph on either of the specimens. This anamorph in culture is similar to Fusarium melanochlorum, the proven anamorph of N. flavoviridis, in colony characters and pigmentation, and in features of conidia and conidiophores. Perithecia of N. flavoviridis are glabrous and superficial.

Typification: New Zealand: North Island, Auckland, Titirangi, Titirangi Beach Reserve, on rachis of Rhopalostylis sapida, 13 Sep. 1980, Samuels (80-121) & Johnston (PDD 41420, holotype; isotype, IMI 297576).