Exobasidium rhododendri-russati
| Exobasidium rhododendri-russati | ||||||||||||
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| Exobasidium rhododendri-russati | ||||||||||||
| Li & Guo |
Exobasidium rhododendri-russati is a mushroom art family of Nacktbasidienverwandten (Exobasidiaceae) from the order Ustilaginomycotina . It is an endoparasite of Rhododendron russatum . Symptoms of the infestation by the fungus are plant galls on the leaves and stems of the host plant, from which mycelium eventuallyproliferates. The range of the species is in China .
features
Macroscopic features
Exobasidium rhododendri-russati is initially invisible to the naked eye. Symptoms of the infestation are small, hypertrophic and hyperplasic gall bladders on the leaves and stems. at a later stage of the infestation, white mycelium carpets break out from them.
Microscopic features
As in all naked basidia , the mycelium of Exobasidium rhododendri-russati grows intercellularly and forms suction threads that grow into the host's storage tissue. The fungus has a monomitic hypha structure made up of purely generative hyphae without buckles . The two- to three-, rarely four-pore, 13–30 × 4–6 µm large basidia are cylindrical to club-shaped and simply septate at the base. They grow directly from the host epidermis . The spores are hyaline , cylindrical to ellipsoid, thin-walled and 11–16 × 2–3 µm in size. When ripe they have one to three, rarely up to five, septa . The conidia are long and narrow, measuring 6–17 × 0.5 μm.
distribution
The known distribution area of Exobasidum rhododendri-russati only includes the Chinese type locality near Yisicun in Shangri-La .
ecology
The host plant of Exobasidium rhododendri-russati is Rhododendron russatum . 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. After falling on a suitable substrate, these germinate into germ tubes , from which new mycelium then develops. The species was found at an altitude of 3300 m.
Individual evidence
- Zhenying Li, Lin Guo: Three new species of Exobasidium (Exobasidiales) from China . In: Mycotaxon . 107, 2009, pp. 215-220.