Identification four new species of Pythium in Hamedan province

The Pythium species were studied in Hamedan province during 2007-2009. Samples were collected from various parts of the province including Hamedan, Nahavand, Malayer, Asadabad, Ghahavand, Touiserkan, Serkan, Razan and Joraghan. Species were identified based on morphological characters of sexual and asexual stages. Of the total of 150 isolates of Pythium recovered, the following 12species P. aphanidermatum, P. deliense, P. hydnosporum, P. irregulare, P. macrosporum, P. oligandrum, P. perplexum, P. pyrilobum, P. salinum, P. tracheiphilum, P. ultimum var ultimum and Pythium group G. were identified. Pythium group G was the dominant species, representing 28% of isolates. According to our knowledge this is probably the first report of isolation of Pythium hydnosporum from Plumbago europaea in the world, while P. hydnosporum, P. macrosporum, P. perplexum and P. pyrilobum are new records for mycoflora of Iran.