Jean D. Schoknecht

X-Ray Microanalysis of Elements in Cells of Va Mycorrhizal and Nonmycorrhizal Onions

Segments of onion roots containing the vesicular-arbuscular mycorrhizal fungi Glomus fasciculatus and G. mosseae were examined with scanning electron microscopy and energy dispersive x-ray microanalysis. Onion cells containing arbuscules had considerable amounts of phosphorus. Cells lacking arbuscules did not contain measurable amounts of phosphorus. This indicates that arbuscules are the sites of release, to the cortical root cells, of phosphorus translocated from the soil by the fungi. Other elements (sulfur, chlorine, potassium, and calcium) were present in both arbuscular and nonarbuscular cells as well as controls. However, relative amounts of these elements did not differ significantly or consistently between these cells.

Revision of Torula Species. Pseudoaegerita Corticalis, Taeniolina Deightonii and Xylohypha Bowdichiae

The type materials of Torula corticalis and T. bowdichiae are not congeneric with Torula as redefined. A new genus Pseudaegerita is erected to accommodate T. corticalis. The new combination Xylohyp...

Revision of Torula species a new combination for Torula quaternata

The general morphology and conidial development of Torula quaternata are characteristic of the genus Tretospora Ellis and a new combination in that genus is proposed.