Exobasidium hypogenum
| Exobasidium hypogenum | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Exobasidium hypogenum | ||||||||||||
| Nannfeldt |
Exobasidium hypogenum is a mushroom art family of Nacktbasidienverwandten (Exobasidiaceae) from the order Ustilaginomycotina . It is an endoparasite of scale heather ( Cassiope spp.). Symptoms of infestation by the fungus are greatly enlarged, red discolored leaves of the host plants. The range of the species includes the temperate to subboreal Holarctic .
features
Macroscopic features
Exobasidium hypogenum is initially invisible to the naked eye. Symptoms of the infestation are red, greatly enlarged (up to 10 × 6 mm) and triangular leaves and, in the late stage, mycelium protruding on the underside of the leaf .
Microscopic features
The mycelium of Exobasidium hypogenum , like all naked basidia, grows intercellularly and forms suction threads that grow into the host's storage tissue. The mostly four-pore basidia are unseptate. They grow directly from the host epidermis or from stomata . The banana-like to subcylindrical spores are hyaline and 13–15 × 2.5–4 µm in size. At first they are unicellular, when ripe they rarely have a septum . The conidia are bacillus to spindle-shaped and 4–11 × 0.8–2.0 µm in size.
distribution
The known distribution area of Exobasidum hypogenum includes the temperate to subboreal regions of Eurasia and North America, but does not penetrate the Arctic Circle.
ecology
The host plants of Exobasidium hypogenum are various scale heather ( Cassiope 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 , from which conidia and new mycelium then develop.
swell
- John Frithiof Nannfeldt: Exobasidium, a taxonomic reassessment applied to the European species . In: Symbolae Botanicae Upsalienses . tape 23 (2) , 1981, pp. 1-71 .