Puccinia franseriae
| Puccinia franseriae | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia franseriae | ||||||||||||
| Sydow & P. Sydow |
Puccinia fran seriae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Ambrosia and Hymenoclea . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in southern North America .
features
Macroscopic features
Puccinia franseriae 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 spots and pustules on the leaf surfaces.
Microscopic features
The mycelium of Puccinia fran seriae 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. The chocolate-brown aecia of the species grow around the spermogonia. They have 25–32 × 20–28 µm in size, spherical to ellipsoidal, almost chestnut brown aeciospores with a spiky surface. The uredia of the mushroom, which grow on both sides, are chocolate brown. Their chestnut brown uredospores are 25–32 × 20–28 µm in size, spherical to ellipsoid and spiky. The parts of the species growing on both sides and on stems are black-brown, compact and uncovered. The chestnut-brown teliospores are two-celled, usually long ovoid to ellipsoid and 37–52 × 25–30 µm in size. Their stem is colorless to light yellowish and up to 175 µm long.
Species delimitation
Puccinia franseriae was considered by Arthur to be a synonym of Puccinia splendens . However, the latter species has warty aeciospores in chains.
distribution
The known distribution area of Puccinia franseriae extends from Utah to Sonora and Baja California . It may also include Ecuador and Peru .
ecology
The host plants of Puccinia franseriae are various grape herbs ( Ambrosia spp.) And Hymenoclea pentalepis . 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 goes through a development cycle with Spermogonia, Aecien, Telien and Uredien, but does not change host.
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .