Identificaciones de johnstonp

Growing on dead rewa rewa leaf (Knightia excelsa), mixed broadleaf podocarp forest, Circular Walk, between Waterfall Track bridge and Troup Picnic, at Ōtari-Wilton’s Bush.

Yellow, stalked discomycete.

Vouchered https://scd.landcareresearch.co.nz/Specimen/PDD%20122699

Leaf spot on pseudopanax. The hyphae are very distinctive with alternating melanised short cells and longer non-melanised segments. Small black dots have angular melanised cells and spores / conidia within.

Spores/conidia are single cells, so not Placosoma.

The hyphae are incredibly distinctive but I haven’t been able to find anything similar yet. DNA saved for eventual sequencing.

On 8 May added image showing progression of leaf symptoms.

Leaf spot on pseudopanax. The hyphae are very distinctive with alternating melanised short cells and longer non-melanised segments. Small black dots have angular melanised cells and spores / conidia within.

Spores/conidia are single cells, so not Placosoma.

The hyphae are incredibly distinctive but I haven’t been able to find anything similar yet. DNA saved for eventual sequencing.

On 8 May added image showing progression of leaf symptoms.

Parasitic on the leaves of a cultivated Metrosideros excelsa × M. umbellata hybrid (the hybrid known as Metrosideros 'Maungapiko', from Aotea (Great Barrier Island)). Causing dark red-black to black circular leisions on the adaxial leaf surface, surface of leisions smooth but centrally punctate. Leisions show up on abaxial leaf surface as brown to yellow-brown discolourations.

Common on dead kopi (Corynocarpus laevigatus) bark - on standing dead trees and on fallen bark shards. Fruiting bodies externally black, rather hard, internally white.

Determination tentative.

Voucher: P.J. de Lange CH2995 & B. Maxwell, PDD 116647

These ascomycete disc-like fungi were up to 7 mm in diameter. The disc surface was smooth and beige-tan in colour with a darker ‘collar’ around the margin which was split up. The underneath of the disc is dark black-brown.

Probably the same as (or allied to) this taxon noted last year on a ridgeline west of this location - see http://naturewatch.org.nz/observations/3712332

Common on the compacted clay ground of a terrace within a old pa site. Ground covered in 5-10 mm of mostly rawiri (Kunzea linearis) leaf-litter. Fruiting body orange to orange-yellow, sessile, disc-shaped, margins undulose.

Voucher: P.J. de Lange 13609, T.J.P. de Lange & G.M. Crowcroft, PDD

Parasitic on the leaves of a cultivated Metrosideros excelsa × M. umbellata hybrid (the hybrid known as Metrosideros 'Maungapiko', from Aotea (Great Barrier Island)). Causing dark red-black to black circular leisions on the adaxial leaf surface, surface of leisions smooth but centrally punctate. Leisions show up on abaxial leaf surface as brown to yellow-brown discolourations.

Locality: NEW ZEALAND AK, Auckland Central, 48-52 Mayoral Drive (Mayoral Drive margin of Aotea Centre grounds).

Habitat: Acacia longifolia. Cultivated tree.

Identification: Uromycladium maritimum McAlpine, 1905. The last image shows a pine pollen grain contaminant.