Puccinia actaeae-elymi
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Puccinia actaeae-elymi is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of buttercups and couch grass . Symptoms of infestation by the species are yellow spots of rust and pustules on the leaf surfaces of the host plants. The distribution area covers large parts of Eurasia .
features
Puccinia actaeae-elymi can only be recognized with the naked eye by means of the spore beds protruding on the surface of the host. They grow in nests that appear as yellowish to brown or blackish spots and pustules on the leaf surfaces.
The mycelium of Puccinia actaeae-elymi grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Your pyknia are yellowish. The aecia of the species grow in circular groups and form bright yellow spots. They have round to broadly elliptical aecidiospores 16–23 × 16–23 µm , which are colorless and warty. The uredia are small, punctiform or elongated and pale brown. Their uredospores are spherical to slightly elliptoid, 19–23 × 19–23 µm in size, light brownish and warty. The parts of the kind are punctiform or oblong and colored black. The teleutospores are two-celled, variably shaped and 33–47 × 14–21 µm in size. They are brown, their stem is hyaline and short.
distribution
Puccinia actaeae-elymi has a distribution area that extends over all of Eurasia.
ecology
The host plants of Puccinia actaeae-elymi are as Haplont buttercups (Ranunculaceae spp.) And couch grass ( Elymus spp.) For the dikaryote . The fungus feeds on the nutrients present in the storage tissue of the plants, its spore beds later break through the leaf surface and release spores. The species has a development cycle with pycnias, uredia, telia and aecidia.
literature
- Ernst Gäumann: The rust fungi of Central Europe. With special consideration of Switzerland . In: Contributions to the cryptogam flora in Switzerland . tape XII . Commission publisher Buchdruckerei Büchler & Co, Bern 1959.