Additional specimen examined: NEW ZEALAND: Auckland, Western Springs, Auckland Zoo, on dead culm of Bambusa sp., G.J. Samuels & W. B. Kendrick, 26 Jan1 1980 (PDD 41017).

Ascomata forming on culms of bamboo in ( groups of 2-5, arranged linearly, and forming black, lenticular spots parallel to the long axis of the host, , 0.5-1.0 mm long x 0.5 mm wide x 0.25 mm high; subepidermal, covered with a thin black stroma that opens by a cleft-like slit at maturity. Ascomata black, subglobose to globose with a somewhat flattened base, c. 200 µm high x 300 µm wide. Ascomatal wall uniform in width, 10-15 µm wide, thinnest basally; cells elliptic to fusiform, c. 15 µm x 4-5 µm, thin-walled, lightly pigmented; cells at the base somewhat smaller. Ostiolar region continuous with the surrounding stromal cells and pierced by the ostiolar canal; ostiolar canal periphysate; periphyses stout, c. 2 µm wide. Cells between ascomata vertically oriented, variable in length, 4-5 µm wide, loosely arranged, lighter brown than cells of ascomatal wall, crushed between walls of adjacent ascomata; cells surrounding the upper third of the ascoma nearly circular in outline, 5-7 µm diam., continuous with stromal surface. Cells of the upper c. 30 µm of stromal surface nearly circular, 5-7 µm diam., heavily pigmented, walls c. 1 µm thick, arranged in a layer continuous between ascomata, subepidermal. Cells at periphery of ascomatal aggregate vertically oriented and brick-like. Asci forming in a continuous layer covering the lower ascomatal wall, broadly cylindrical, 100-120 (-130) x 20-25 µm; unitunicate, apex broadly rounded, simple, I-; base broadly pedicellate with two pores, each in a position corresponding to one of the two septa separating the tip, penultimate and basal cells of the crozier; ascospores biseriately arranged. Ascospores naviculate, 28-32(-35) x 9.5-10.5 µm at widest point x 5.5-6.5 µm wide at septum (mean of 19 ascospores = 30.8 x 10.0 µm; 1-septate; upper cell 23-28 µm long; straight or basal cell laterally displaced; spores hyaline, smooth. Paraphyses attached basally, apically free, sparingly branched, thin-walled, septate, slightly longer than asci, 4 µm wide, tapering slightly toward the tip.
Anamorph. Arthrinium sp.
Conidiomata superficially resembling ascomata, parallel to long axis of host, opening by longitudinal splitting of epidermis to reveal a black conidial mass. Setae lacking. Conidiogenous cells arising in a single layer from a c. 10 µm-thick pseudoparenchymatous base, cells of the base slightly thick-walled, lightly pigmented, 5-7 µm across. Conidiophore mother cells ampulliform, oblong, ovate to subglobose, 8-15 µm x c. 5 µm, light brown, with superficial granular depositions, opening widely at the apex and appearing cupulate, producing a single conidiophore. Conidiophores cylindrical, 10-25 x c. 4 µm, basauxic, polyblastic, straight or flexuous, unbranched, colourless or light brown, with granular depositions near the apex; septate, septa not markedly thickened or pigmented. Conidia borne singly, apically and laterally, the oldest at the top of the conidiophore; holoblastic; bell-shaped in face view, (14-)15-17(-19) µm high x 15-17(-18) µm across the flat top with a light coloured, horizontal rim just below the top and a ragged, circular, 3-4 µm diam. abscission scar on the under side, brown, smooth.
Characteristics in culture: Colonies grown for 1 week at 18-20°c, diffused daylight; CMD: 6-7 cm diam., aerial mycelium scant, white, transparent; PDA and ME: 8 cm diam., aerial mycelium scant, white to pink, transparent to translucent. Conidia forming after 2 weeks in white hyphal tufts.

Habitat: On dead culms of Bambusa spp.

Ascomata stromate atro tecta, nigra, in strias parallelas, lineares, 1-2 mm long, per rimas epidermidis erumpentia. Asci unitunicati, hymenium formantes, clavati, 100-120 (-130) x 20-25 µm, parti apicali iodo non coerulescenti. Ascosporae oblongo clavatae, interdum curvatae, basi uniseptatae, hyalinae, 28-32(-35) x 9.5-10.5 µm. Paraphyses pauciramosae, hymenio affixae.
Status conidialis ad Arthrinium (= Scyphospora phyllostachydis Kantschaveli) referabilis. Conidia brunnea, tintinnabuliformia, (14-)15-17(-19) µm altitudine, 15-17 (-18) µm crassa.
Holotypus. PDD 41022.

Etymology of the specific epithet: Derived from the Latin, tintinnabulum; and meaning a little bell, in reference to the conidial shape.

Holotype: NEW ZEALAND: Waikato, Paeroa, on dead culm of Bambusa sp. E. H. C. McKenzie & P. R. Johnston, 28 Feb. 1980 (PDD 41022).