Morphological characteristics and DNA sequence analysis of Petriella setifera and Oidiodendron setiferum from twigs of diseased oak

Hanna Kwaśna, Piotr Łakomy, Andrzej Łabędzki


Examination of isolates of Petriella setifera and Oidiodendron setiferum revealed new diagnostic morphological charactcristics. Chlamydosporcs formed by P. setifera, isolated from twigs of sessile oak (Quercus petraea) showing symptoms of oak decline, are described for the first time. The first pictures of P. setifera anamorphs since the publication of its original description in 1912 are presented. Isolates of O. setiferum, from sessile oak twigs and from a log of Scots pine (Pinus sylvestris), were found to have swollen, hyaline, thin-walled, sterile apices on the non-fertile hairs surrounding the fertile heads of conidiophores. They also had numerous coils formed by thin hyphae in the submerged mycelium in agar culture. The taxonomy of both fungi was confirmed by rDNA sequence analysis.


morphology; Oidiodendron setiferum; Petrilla setifera; rDNA sequence analysis; taxonomy

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