Taxonomic Consideration on Two Closely Related Species, Pythium paddicum and P. polypapillatum Taxonomic Consideration on Two Closely Related Species, Pythium paddicum and P. polypapillatum

Seventy-two isolates were tentatively identified as Pythium paddicum and several of them were compared for the morphological variation of projection on the oogonium. This fungus produced four types of projections on various culture media with different isolates and incubation temperatures, unlike the original description by Hirane. P. paddicum having various types of projection resembled the original description of P. polypapillatum. In November, 1985, two isolates of Pythium sp. which resembled P. polypapillatum were newly isolated from damp ground adjacent to the pond where P. polypapillatum had been originally isolated 50 years ago. P. paddicum seems to be identical with P. polypapillatum.

Seventy-two isolates were tentatively identified as Pythium paddicum and several of them were compared for the morphological variation of projection on the oogonium. This fungus produced four types of projections on various culture media with different isolates and incubation temperatures, unlike the original description by Hirane. P. paddicum having various types of projection resembled the original description of P. polypapillatum. In November, 1985, two isolates of Pythium sp. which resembled P. polypapillatum were newly isolated from damp ground adjacent to the pond where P. polypapillatum had been originally isolated 50 years ago. P. paddicum seems to be identical with P. polypapillatum.