H.J. Swart

Dodine: A selective agent for certain soil fungi

Oatmeal agar containing 650 p.p.m. active dodine is selective for some soil-inhabiting fungi, in particular Beauveria bassiana and Metarhizium spp. which are rarely isolated from soil by other isolation techniques.

Australian leaf-inhabiting fungi

Two recently collected Vizella specimens are the first records of this asco-mycete genus in Australia. The genus is discussed and the Australian specimens are described as V. banksiae sp.nov. and V. oleariae sp.nov. The latter possesses a conidial and an apparently spermatial state. In both species the asci arise from a complex system of proliferating croziers. The new family Vizellaceae is described to accommodate Vizella and Blasdalea and is regarded as fairly closely related to the Asterinaceae.

The fungus causing Cypress canker

Rhynchosphaeria cupressi Nattrass, Booth & Sutton is redescribed from the type material and from material recently collected in Australia. The name is transferred to Lepteutypa Petrak. It is argued that its conidial state, referred to as Monochaetia unicornis (Cke & Ell.) Sacc. or Cryptostictis cupressi Guba, and Seiridium cardinale (Wagener) Sutton & Gibson may be extreme variations of one species. A spermatial state is described and illustrated.

Australian leaf-inhabiting fungi. XXVI. Some noteworthy coelomycetes on Eucalyptus

Stilbospora foliorum and Ceuthospora innumera are illustrated from type material and briefly discussed. Conidiogenesis in Fairmaniella leprosa is described in detail. Phoma australis, Septoria pulcherrima, Leptostromella eucalypti and Cylindrosporium samuelii are illustrated, discussed and reclassified as Idiocercus australis, Stagonospora pulcherrima, Thyrinula eucalypti and Seimatosporium samuelii . Three species are described as new: Macrohilum eucalyti, Davisoniella eucalypti and Blastacervulus eucalypti .

Australian leaf-inhabiting fungi. XXVIII. Hendersonia on Eucalyptus

Of the seven species of Hendersonia described from Eucalyptus , five are considered in detail. H. eucalypti is shown to be the same as Seimatosporium lichenicola and H. grandispora is identical with the species commonly called Phaeoseptoria eucalypti. H. fraserae is the same as the earlier-described H. eucalypticola . The new genus Sonderhenia is proposed for the two leaf parasites H. eucalyptorum and H. eucalypticola and is characterized by brown distoseptate conidia with finely roughened walls produced from brown annellidic conidiogenous cells borne in pycnidia. It is distinct from Phaeoseptoria and from the species commonly called P. eucalypti , whose taxonomic position will be considered elsewhere.

Conidial structure in two species of pestalotiopsis

Sections of developing and mature conidia of Pestalotiopsis funerea Desm. and P. triseta (F. & J. Moreau) Steyaert were examined ultrastructurally. Conidia are sheathed in single-layered walls in which the peripheral zone becomes electron dense. In P. triseta the septum separating the upper two median cells, together with the lateral conidial walls, are impregnated with melanizing material. Evidence is presented which indicates similarities between melanin deposition in fungi and lignification in the cells of higher plants.

Australian leaf-inhabiting fungi XVI. Vermisporium, a new genus of coelomycetes on Eucalyptus leaves

The generic name Vermisporium is proposed for a group of leaf-spotting fungi found on Eucalyptus . Five new species are described and one new combination is made.

Australian leaf-inhabiting fungi: XI. Phyllachora eucalypti

The name Phyllachora eucalypti has been applied to two different organisms which are not congeneric. One is a parasite on living Eucalyptus leaves, the other is a saprophyte on dead leaves. Both are discussed, illustrated, and reclassified.

Australian leaf inhabiting fungi. X. Seimatosporium species on Callistemon, Melaleuca and Leptospermum

Seimatosporium dilophosporum, S. kriegerianum, S. elegans sp.nov. and S. leptospermi are presented as a natural group of closely-related species. Perfect states for these species have been found and Discostrotnopsis gen.nov. is described to accommodate them.

Conidial structure in Pestalotia pezizoides

Electron microscope examination of conidia of Pestalotia pezizoides de Not. shows differentiation of the wall of the central cells into three zones; a narrow outer electron-dense zone, a wide central, melanized zone and an inner hyaline zone. The relationship between this species and species of Pestalotiopsis Steyaert is considered.