Abstract

Euryancale phallospora is described as a new species of the Zoopagales found in Japan. The conidium is phallus-shaped and composed of a bulbous basal portion tapering gradually towards the apex which is shaped like an arrowhead. Infection is initiated by the conidium, the apical portion of which lodges in the nematode's mouth. High voltage electron microscopy shows clearly that the mature conidium has a dome-shaped apex. The periphery of the apical dome has 14-15 electron-dense, bar-shaped appendages flaring like a skirt below the apex. Additional, almost median, appendages are present on the conidial wall. The apical dome is composed of an electron-dense hemispherical core covered with an extremely thick cell wall. The thick wall is coated with a layer of weakly staining material. A pouchy appendage connected to the outermost layer by a short and narrow stalk is clearly seen at the distal end of the conidium.

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