Exobasidium savilei
| Exobasidium savilei | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Exobasidium savilei | ||||||||||||
| Nannfeldt |
Savilei Exobasidium is a mushroom art family of Nacktbasidienverwandten (Exobasidiaceae) from the order Ustilaginomycotina . It is an endoparasite of the peat turf ( Chamaedaphne calyculata ). Symptoms of the infestation by the fungus are the light green to dark reddish discoloration of the leaves of the host plants. The range of the species includes the temperate to subboreal Holarctic .
features
Macroscopic features
Exobasidium savilei is initially invisible to the naked eye. Symptoms of the infestation are light green to dark red discolored leaves, which are also slightly enlarged, and in the late stage mycelium protruding on the underside of the leaf .
Microscopic features
The mycelium of Exobasidium savilei grows as with all exobasidium intercellular and forms Saugfäden that grow into the storage tissue of the host. The mostly four-pore basidia are up to 5 µm wide and unseptate. They grow directly from the host epidermis or from stomata . The thick banana-like to sub-cylindrical shaped spores are hyaline and 10–13 × 2.5–4 µm in size. The conidia are ellipsoidal or bacillus to almost spindle-shaped and 6–20 × 0.8–4 µm in size.
distribution
The known distribution area of Exobasidum savilei includes the temperate to subboreal regions of Eurasia and North America.
ecology
The host plant of Exobasidium savilei is the peat grape ( Chamaedaphne calyculata ). 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 .