Exobasidium ledi
| Exobasidium ledi | ||||||||||||
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| Scientific name | ||||||||||||
| Exobasidium ledi | ||||||||||||
| Karsten |
Exobasidium ledi is a mushroom art family of Nacktbasidienverwandten (Exobasidiaceae) from the order Ustilaginomycotina . It is an endoparasite from Porsten ( Rhododendron subsect. Ledum spp.). Symptoms of infection by the fungus are yellowish spots on the leaves of the host plants. The range of the species includes the subboreal Palearctic .
features
Macroscopic features
Exobasidium ledi is initially invisible to the naked eye. Symptoms of the infestation are yellowish leaf spots up to 5 mm wide and, in the late stage, protruding mycelium on the underside of the leaf .
Microscopic features
The mycelium of Exobasidium ledi grows as with all exobasidium intercellular and forms Saugfäden that grow into the storage tissue of the host. The four-pore basidia are up to 100 µm long and unseptate. They grow directly from the host epidermis or from stomata . The banana-like to sub-cylindrical shaped spores are hyaline and 12–15 × 2.5–4.5 µm in size. The conidia are bacillus to almost spindle-shaped and 4–6 × 1.0 µm in size.
distribution
The known distribution area of Exobasidum ledi includes the subboreal regions of Eurasia. The species may also be found in North America.
ecology
The host plants of Exobasidium ledi are various pores ( Rhododendron subsect. Ledum spp.). The fungus feeds on the nutrients present in the storage tissue of the plants, its basidia later break through the leaf surface and release spores. The spores germinate into germ tubes and conidia, from which new mycelium then develops.
swell
- John Frithiof Nannfeldt: Exobasidium, a taxonomic reassessment applied to the European species . In: Symbolae Botanicae Upsalienses . tape 23 (2) , 1981, pp. 1-71 .