Puccinia orchidearum-phalaridis
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| Puccinia orchidearum-phalaridis | ||||||||||||
| Klebahn |
Puccinia orchidearum-phalaridis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of orchids and glossy 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 includes Central Europe.
features
Macroscopic features
Puccinia orchidearum-phalaridis 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.
Microscopic features
The mycelium of Puccinia orchidearum-phalaridis grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Your pyknia are orange in color. The aecia of the species grow in groups and form yellowish spots. They have spherical to oval aecidiospores 18–23 × 16–19 µm , which are colorless and warty. The uredia are small, bubble-shaped and rust-colored. Their uredospores are spherical to polyhedral, 26–29 × 18–23 µm in size, yellowish and prickly. The Telien the way are dot or line-shaped and black. The teleutospores are two-celled, club-shaped and 35–46 × 15–18 µm in size. They are brown, their stem is very short.
distribution
Puccinia orchidearum-phalaridis has a distribution area that extends over Central Europe.
ecology
The host plants of Puccinia orchidearum-phalaridis are as haplont orchids (Orchidaceae spp.) And reed grass ( Phalaris arundaecea ) 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.