Exobasidium arctostaphyli
| Exobasidium arctostaphyli | ||||||||||||
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| Scientific name | ||||||||||||
| Exobasidium arctostaphyli | ||||||||||||
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Exobasidium arctostaphyli is a fungus - kind of the family of Nacktbasidienverwandten (Exobasidiaceae) from the subdivision Ustilaginomycotina . It lives as an endoparasite in Arctostaphylos arbutoides . Symptoms of the infestation by the fungus: reddish galls on the leaf surface and hypertrophy of the host plant buds. The species is native to Costa Rica .
features
Macroscopic features
Exobasidium arctostaphyli can initially be seen with the naked eye, the species does not form any mycelial felt on the host surface. Symptoms of the infestation are large, reddish galls on old stems of the host plant as well as hypertrophy on their buds, which lose their chlorophyll .
Microscopic features
As with all naked basidia , the mycelium of Exobasidium arctostaphyli grows intercellularly and forms suction threads that grow into the host's storage tissue. The three- to four-pore, 28–32 × 6–7 µm large basidia are unseptate and elliptical-club-shaped. They grow directly from the host epidermis or from stomata . The rounded-ellipsoidal spores are hyaline , 9–19 × 3.5–6 µm in size. At first they are unsepted, when ripe they have up to four septa . Apparently there are no conidia .
distribution
The known distribution area of Exobasidum arctostaphyli extends over large parts of the province of San José in Costa Rica .
ecology
The host plant of Exobasidium arctostaphyli is Arctostaphylos arbutoides . The fungus feeds on the nutrients present in the storage tissue of the plants, its basidia later break through the epidermis and release spores. After they have fallen on a suitable substrate, these germinate in germ tubes, from which new mycelium then develops.
swell
- Luis D. Gómez, Luiz D., Liuba Kisimova- Horovitz: Basidiomicetes de Costa Rica. Nuevas especies de Exobasidium (Exobasidiaceae) y registros de Cryptobasidiales . In: Revista de Biología Tropical . 46, No. 4, 1998, pp. 1081-1093.