Cumminsiella mirabilissima
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Cumminsiella mirabilissima on Oregon grape |
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| Scientific name | ||||||||||||
| Cumminsiella mirabilissima | ||||||||||||
| ( Peck ) Nannfeldt |
Cumminsiella mirabilissima is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of Mahonia . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in North America and Europe.
features
Macroscopic features
Cumminsiella mirabilissima 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 spots and pustules on the leaf surfaces.
Microscopic features
The mycelium of Cumminsiella mirabilissima grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow on the upper side of the host leaves and are orange. The aecia of the species, which mainly grow on the underside of the leaves, are cylindrical and yellow and are located on black-green spots. Their light orange aeciospores are 17–24 × 15–21 µm in size, angular-spherical to ovate and finely spiky. The uredia of the fungus that grow underneath the leaves are light brown and compact. Their light brown uredospores are approximately spherical to pear-shaped, 22–38 × 16–24 µm in size and spiky. The parts of the species, which often arise from the uredia, are black-brown and elliptical to elongated. The hyaline to dark pigmented teliospores are two-celled, four-walled, usually ellipsoidal to long-ellipsoidal and waisted and 30–36 × 20–25 µm in size. Their stem is colorless and up to 200 µm long.
distribution
The well-known range of Cumminsiella mirabilissima originally comes from North America and was introduced by humans into Europe at the beginning of the 20th century . They are often found in parks on planted Mahonia.
ecology
The host plants of Cumminsiella mirabilissima are Mahonia ( Mahonia spp.). 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 Aecien, Spermogonia, Telien and Uredien and does not change host.
literature
- Ernst Gäumann: The rust fungi of Central Europe. With special consideration of Switzerland . In: Contributions to the cryptogam flora in Switzerland . tape 12 . Commission publisher Buchdruckerei Büchler & Co, Bern 1959.
