Puccinia elymi
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| Scientific name | ||||||||||||
| Puccinia elymi | ||||||||||||
| Westendorp |
Puccinia elymi is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of meadow rue 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 all of Eurasia .
features
Puccinia elymi can only be recognized with the naked eye by means of the spore beds emerging 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 elymi grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their pycnias and aecias are not described in detail. The uredia grow individually or in rows and are light brown. Their uredospores are spherical to slightly ellipsoidal, 22–32 × 17–23 µm in size, pale brown and spiky. The parts of the species grow as ovals on the underside of the leaves and are long covered and grayish. The teleutospores are two- to four-celled, club- to spindle-shaped and 54–90 × 10–18 µm in size. They are light brown, their stem is very short and brown.
distribution
Puccinia elymi has a distribution area that extends over the entire Eurasia.
ecology
The host plants of Puccinia elymi are Haplont meadow rue ( Thalictrum 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.