Puccinia sessilis

Aecien of Puccinia sessilis on spotted arum

Puccinia sessilis is a Ständerpilzart from the order of rust fungi ( Pucciniales ). The fungus is an endoparasite of aroids, Sword lily plants, lily plants and orchids, as well as Schwingeln and shine grasses. Symptoms of infestation by the way are rust spots and pustules on the leaf surfaces of host plants. It is widespread Holarctic.

Features

Macroscopic characteristics

Puccinia sessilis 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 sessilis growing intercellular like all Puccinia species and forms Saugfäden that grow into the storage tissue of the host. The Aecien the type having 18-25 × 15-20 microns wide, ellipsoidal to spherical and hyaline - yellowish Aeciosporen. The zimtbraunen uredia kind of grow on both sides of the leaves of the host plant. Your golden to zimtbraunen uredospores are breitellipsoid usually to ovate, 27-32 × 22-26 microns in size and finely stachelwarzig. The expanding mutual Telien the type are black and long covered. The bright hazel teliospores of the fungus are two-celled, long clavate to oblong in general and 40-56 × 18-23 microns in size. Your stem is brownish and up to 15 microns long.

Dissemination

The known distribution area of Puccinia sessilis covers the entire Holarctic.

Ecology

The host plants of Puccinia sessilis are for the haploid aroids ( Araceae spp.), Sword lily family ( Iridaceae spp.), Lily family ( Liliaceae spp.) And orchids (Orchidaceae spp. ) And fescue ( Festuca spp. ) 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 set free spores. The type has a development cycle with Telien, uredia, spermogonia and Aecien and does a landlord change through.