Exobasidium
Alpen Rose apple, caused by Exobasidium rhododendri
The Nacktbasidien ( Exobasidium ) is a fungal genus in the family Nacktbasidienverwandten ( Exobasidiaceae ).
Features
Macroscopic characteristics
Nacktbasidien are parasites on ericaceous ( Ericaceae ). Some species parasitize leaves, shoots and other some years the entire plant (systemic infection). Infected leaves and shoots are often inflated vesicular or colored misshapen and pale or mostly red.
Microscopic characteristics
The hyphae are intracellular and have no buckles. The underside of the leaves is coated with hymenium rarely also relates to the entire rung. The spores are elliptical or cylindrical, usually curved, hyaline, smooth, inamyloid and have 1-3 septa at maturity on.
Species
In Europe there are about 26 species. For Central Europe, information on the distribution is very patchy. Here, among others, the following species occur:
On bog rosemary ( Andromeda polyfolia )
- Exobasidium karstenii
- Exobasidium sundstroemii
In alpine bearberry ( Arctosaphylos alpina)
- Angustisporum Exobasidium
On Real bearberry ( Arctostaphylos uva- ursi )
- Exobasidium sydowianum
- Exobasidium uvae -ursi
On Tundrenheide ( Cassiope tetragona )
- Exobasidium hypogenum
- Exobasidium cassiopes
On Torfgränke ( Chamaedaphne calyculata )
- Exobasidium cassandrae
- Exobasidium savilei
On Cranberry (Vaccinium oxycoccos )
- Exobasidium rostrupii
- Exobasidium oxycocci
On blueberry ( Vaccinium myrtillus)
- Exobasidium arescens
- Exobasidium Myrtilli
On bog bilberry (Vaccinium uliginosum )
- Exobasidium pachysporum
- Exobasidium vaccinii - uliginosi
- Exobasidium expansum
On cranberry (Vaccinium vitis- idaea )
- Exobasidium vaccinii
- Exobasidium splendidum
- Exobasidium juelianum
On Rostblättriger Alpenrose (Rhododendron ferrugineum ) and ciliated Alpenrose (Rhododendron hirsutum )
- Alpen Rose Nacktbasidie ( Exobasidium rhododendri )
Source
- Sven Gunnar Countryman, Ingmar Holmåsen: Mushrooms: described over 1,500 species of fungi in detail and photographed in natural surroundings. Bernhard Thalacker Verlag, Braunschweig, 1992, ISBN 3-87815-043-1