Exobasidium woronichinii
| Exobasidium woronichinii | ||||||||||||
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| Exobasidium woronichinii | ||||||||||||
| Hennings |
Exobasidium woronichinii is a mushroom art family of Nacktbasidienverwandten (Exobasidiaceae) from the order Ustilaginomycotina . It is an endoparasite of Rhododendron brachycarpum . Symptoms of infection by the fungus are the bleaching of the leaves of the host plants. The species is common in Japan .
features
Macroscopic features
Exobasidium woronichinii is initially invisible to the naked eye. The symptom of the infestation is chlorosis of the host's leaves.
Microscopic features
As with all naked basidia , the mycelium of Exobasidium woronichinii grows intercellularly and forms suction threads that grow into the host's storage tissue. The two- to four-pore, 10–60 × 4.5–12 µm large basidia are long, unseptate and cylindrical to club-shaped. They grow directly from the host epidermis or from stomata . The elliptical to egg-shaped spores are hyaline and 11–19 × 3–4.5 µm in size. At first they are unsepted, when ripe they have one to five, rarely six septa . The conidia are hyaline, variable in shape and 2–30 × 1–2.5 μm in size.
distribution
The known distribution area of Exobasidum woronichinii extends over all of Japan .
ecology
The host plant is Exobasidium woronichinii is Rhododendron brachycarpum . 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 they have fallen on a suitable substrate, these germinate into germ tubes and conidia, from which new mycelium then develops.
swell
- Hideyuki Nagao, Toyozo Sato, Makoto Kakishima: Three species of Exobasidium causing Exobasidium leaf blight on subgenus Hymenanthes, Rhododendron spp., In Japan . In: Mycoscience . 45, No. 2, 2004, ISSN 1340-3540 , pp. 85-95. doi : 10.1007 / s10267-003-0162-8 .