Exobasidium cassiopes
| Exobasidium cassiopes | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Exobasidium cassiopes | ||||||||||||
| Peck |
Exobasidium cassiopes is a mushroom art family of Nacktbasidienverwandten (Exobasidiaceae) from the order Ustilaginomycotina . It is an endoparasite of the Mertens-Schuppenheide ( Cassiope mertensiana ). Symptoms of infestation by the fungus are light-colored shoots and misshapen leaves of the host plants. The range of the species is in the northern Holarctic .
features
Macroscopic features
Exobasidium cassiopes is initially invisible to the naked eye. Symptoms of the infestation are light green to light pink shoots with hardly separated pairs of leaves and deformed leaves up to 6 × 3 mm in size as well as mycelium protruding on the host surface in the late stage .
Microscopic features
The mycelium of Exobasidium cassiopes grows as with all exobasidium intercellular and forms Saugfäden that grow into the storage tissue of the host. The rarely two-, mostly three- to four-pore basidia are unseptate. They grow directly from the host epidermis or from stomata . The banana-like shaped spores are hyaline and 10–16 × 2.5–3.5 µm in size. At first they are unicellular, when ripe they show one to three septa . The conidia are 6–12 × 0.8–1.5 µm in size and bacillus to almost club-shaped or spindle-shaped.
distribution
The known distribution area of Exobasidum cassiopes includes the northern regions of the Holarctic from Europe to North America.
ecology
The host plant of Exobasidium cassiopes is the Mertens Schuppenheide ( Cassiope mertensiana ). 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 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 .