Exobasidium schinzianum
| Exobasidium schinzianum | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Exobasidium schinzianum | ||||||||||||
| Magnus |
Exobasidium schinzianum is a mushroom art family of Nacktbasidienverwandten (Exobasidiaceae) from the order Ustilaginomycotina . It is an endoparasite of Saxifraga rotundifolia . Symptoms of infection by the fungus are bright spots on the leaves of the host plant. The range of the species covers a small area in the Swiss Alps .
features
Macroscopic features
Exobasidium schinzianum cannot be seen with the naked eye. Symptoms of the infestation are light-colored, up to 30 mm wide spots on the infested leaves, in which no increased growth can be observed. It is similar to Exobasidium warmingii , but it causes hypertrophy and occurs on other saxifrage species.
Microscopic features
The mycelium of Exobasidium schinzianum , like all naked basidia, grows intercellularly and forms suction threads that grow into the host's storage tissue. The two-pored, 30–60 × 3–6 µm large basidia are simply septate at the base. They grow directly from the host epidermis . The spores are hyaline , cylindrical, thin-walled and 10–15 × 2–3 µm in size. When ripe they have a septum . The conidia of the species are 6–12 × 1 µm in size and cylindrical to thread-like.
distribution
The known distribution area of Exobasidum schinzianum only includes the Swiss Alps , but is possibly more widespread.
ecology
The host plant of Exobasidium schinzianum is Saxifraga rotundifolia . 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 conidia , from which new mycelium then develops.
swell
- E. Müller: Reflections on the Geographical Distribution of Exobasidium warmingii . In: Kew Bulletin . 31, No. 3, 1977, pp. 545-550.