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SUMMARY
A new species of Achlya, from Michigan, is described as Achlya spiracaulis. The fungus is characterized by long, tightly or loosely coiled oogonial stalks, by which it is easily distinguished from all other species of Achlya; large, papillate, spherical to irregular oogonia; large, centric oospores; unpitted oogonial walls, and a low percentage of about equally diclinous and androgynous antheridia.
The fungus was grown under several varied environmental conditions (including those simulating natural ones), to induce changes in the distinguishing morphological characteristics, but the results of these preliminary studies show that the coiled oogonial stalks, origin of oogonia, and frequency and type of papulations are consistently stable.