Exobasidium pernettyae
| Exobasidium pernettyae | ||||||||||||
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| Scientific name | ||||||||||||
| Exobasidium pernettyae | ||||||||||||
| Goméz & Kisimova-Horovitz |
Exobasidium pernettyae is a mushroom art family of Nacktbasidienverwandten (Exobasidiaceae) from the order Ustilaginomycotina . It lives as an endoparasite on Pernettya coriacea . Symptoms of the infestation by the fungus are mycelial carpets on the underside of the leaves of the host plants, more rarely also reddish leaf galls . The species isnativeto the area of Costa Rica .
features
Macroscopic features
Exobasidium pernettyae is initially invisible to the naked eye. Symptoms of the infestation are mycelial felts on the underside of the affected leaves, and in some cases reddish leaf galls develop.
Microscopic features
As with all naked basidia , the mycelium of Exobasidium pernettyae 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 four-pore, 20–26.5 × 4–4.5 µm large basidia are simply septate at the base. They grow directly from the host epidermis or from stomata . The elliptical spores are hyaline , thin-walled, and 6.5–10.5 × 2–2.5 µm in size. When ripe they have two to three septa . The conidia are milky-hyaline, 6.5–8.5 × 1–2 µm in size and bacillus-shaped .
distribution
The known range of Exobasidum pernettyae includes the center of Costa Rica .
ecology
The host plant of Exobasidium pernettyae is Pernettya corniacea . 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
- Luis D. Gómez, 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.