Puccinia purpurea

Puccinia purpurea on sorghum

Puccinia purpurea is a Ständerpilzart from the order of rust fungi ( Pucciniales ). The fungus is an endoparasite of Oxalis (Oxalis corniculata ) and from grasses of the tribe Andropogoneae. Symptoms of infestation by the way are rust spots and pustules on the leaf surfaces of host plants. It is distributed worldwide.

Features

Macroscopic characteristics

Puccinia purpurea is with the naked eye can be seen only on the basis of the projected on the surface of the host spore deposits. They grow in clusters that appear as yellowish to brown spots and pustules on the leaf surfaces.

Microscopic characteristics

The mycelium of Puccinia purpurea grows intercellular as with all Puccinia species and forms Saugfäden that grow in the storage tissues of the host. Aecien or spermogonia the type is not known. The hazel uredia the fungus grow mostly on the underside of the leaf surfaces of the host plant. Your also zimtbraunen uredospores are ellipsoid to nearly globose, 30-40 × 23-29 microns in size and finely stachelwarzig. The Telien are black brown, uncovered and compact. The hazel teliospores are two-celled, ellipsoid in the rule or langellipsoid and 40-50 × 24-30 microns in size; its stem is hyaline or yellowish and up to 95 microns long.

Dissemination

Ecology

The host plants of Puccinia purpurea are Oxalis (Oxalis corniculata ) for the haploid and grasses of the tribe Andropogoneae ( sorghum and lemon grass) for the dikaryotic. The fungus feeds on the present in storage tissues of the plant nutrients, its spores bearing later break through the leaf surface, and put spores free. The type has a development cycle, from the hitherto known only Telien and uredia; Spermogonia and Aecien could not be assigned to the fungus.