Puccinia alternans
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| Scientific name | ||||||||||||
| Puccinia alternans | ||||||||||||
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Puccinia alternans is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of rue and brusps . Symptoms of infestation by the species are yellow spots of rust and pustules on the leaf surfaces of the host plants. The distribution area includes the entire Holarctic .
features
Puccinia alternans 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 alternans is growing as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Your pyknia are spherical and sunken. The aecia of the species grow in groups that are purple on the upper side and yellowish on the underside. They have truncated polyhedral ellipsoidal aecidiospores of 19-30 × 17-20 µm that are colorless and warty. The uredia grow scattered and on the upper side of the leaf, penetrate the epidermis early and are orange. Their uredospores are spherical to slightly ellipsoidal, 17–33 × 17–26 µm in size, yellowish and spiky. The parts of the species grow in groups on the underside of the leaves and are long covered and black-brown. The teleutospores are two-celled, mostly club-shaped and 26–74 × 10–20 µm in size. They are brownish, one stem is short and firm.
distribution
Puccinia alternans has a distribution area that extends over the entire northern temperate hemisphere.
ecology
The host plants of Puccinia alternans are as Haplont meadow rue ( Thalictrum spp.) And Trespen ( Bromus 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.