Notes: Laundon (1970: 55, Fig. 3) recorded, described and illustrated the present fungus as 'Cercospora myrticola Speg.', which differs, however, in having subcylindical, wider conidia with obtuse or subacute apex and truncate to somewhat obconically truncate base. McKenzie (1990) and McKenzie et al. (1999) recorded and discussed additional collections of 'Po myrticola' on Metrosideros excelsa and P. parkinsonii from New Zealand. Pseudocercospora eucalyptigena is the only comparable cercosporoid species on hosts of the Myrtaceae with acicular conidia, but this species differs in having distinct lesions, smaller stromata and conidiophore fascicles as well as subdenticulate conidiogenous cells.

Type: Foliicolous Fungi; Description: Mycelium internal. Hyphae olivaceous brown to brown, aggregating to form stromata. Stromata well-developed, intraepidermal to substomatal, somewhat erumpent, 20–60 μm in diameter. Conidiophores in moderately large to large, loose to moderately dense fascicles arising from stromata, straight, pale olivaceous to olivaceous brown, smooth, 0–3-septate, 10–50 × 2–3 μm; conidiogenous cells with inconspicuous scars. Conidia filiform, acicular, 3–10-septate, 30–100 × 2–3 μm, smooth, subhyaline to pale olivaceous. Leaf spots dark brown to blackish or reddish brown, roughly circular, 1–5 mm in diameter with a distinct raised margin and a purplish halo, on both sides of leaves.

Distribution: Taranaki.; 1st Record: Laundon (1970: as Cercospora myrticola).

Significance: None.; Host(s): Metrosideros excelsa, M. parkinsonii.