Puccinia substerilis
| Puccinia substerilis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia substerilis | ||||||||||||
| Ellis & Everhart |
Puccinia substerilis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of feather grass . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in North America .
features
Macroscopic features
Puccinia substerilis 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 Puccinia substerilis grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Aecia or spermogonia of the species are not known. The uredia of the fungus grow on the upper side of the host leaves. Its golden to cinnamon-brown uredospores are 23–26 × 18–22 µm in size, broadly ellipsoidal to spherical and finely spiky. The species has 25–30 × 20–25 µm large amphispores , which are broadly ellipsoidal to egg-like in shape and colored hazel brown. The parts of the species growing on the top of the leaves are blackish, powdery and uncovered early. The hazelnut-brown teliospores are two-celled, usually long ellipsoid and 32–40 × 16–19 µm in size. Their stalk is hyaline and up to 80 µm long.
distribution
The known distribution area of Puccinia substerilis extends from Minnesota to New Mexico .
ecology
The host plants of Puccinia substerilis are various feather grasses ( Stipa 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 of which only Telien and Uredien and their host are known; Spermogonia and aecia could not be assigned to the fungus.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin et al. 1971, ISBN 3-540-05336-0 .