Aphanomyces cladogamus

Aphanomyces cladogamus Drechsler, Jour. Agr. Res
38: 329. 1929.
Hyphae 3.5-10 /x thick, sparingly or moderately branched, the aerial development scant; sporangia usually 7-8.5 /i thick, very long, separated by septa or plugs, at times with many branches and several evacuationtubes, often with several lateral protuberances in the distal portion which may open and allow the spores to escape, a few to 300 spores escaping from a single opening; spores 7-10 fi in diameter; oogonia terminal on short or long branches, subspheric, smooth, 19-33 fi in diameter, averaging 26.8 n, the wall smooth on the outer surface, the inner contour irregular, 0.8-1.9 /* thick, the stalk usually making contact with an antheridial branch and sometimes coiling about the latter; eggs one to an oogonium, subspheric, usually nearly colorless, 15.3-25.6 n in diameter (averaging 21.8 /i), eccentric, the wall averaging 1.5 n thick; antheridia two or three to an oogonium, the inflated part about 10 m in diameter and 13 /z long and often with an apical and a proximal prolongation, the inflated portion often sunken in the oogonial wall where the fertilization-tube is formed, borne on slender lateral branches of androgynous or diclinous origin. (Description compiled.)
Type locality : Washington, D. C.
Habitat: Parasitic on roots of Ly coper sicum esculentum Mill. Distribution: Known only from the type locality.

Aphanomyces cladogamus is an oomycete plant pathogen.