1. Studies about the behavor of Puccinia glumarum in the greenhouse, are presented here.
2. The behavor of 11 wheat varieties, places and dates, 70 samples of wheat, collocted over different varieties, places and dates, is given here.
3. First determinations made in Chile, of physiological races of P. glumarum, are presented.
4. Race N° 10 is the only one that is included among the 39 races described by Straib.
5. The other reactions were provisionally placed into 4 groups. The hypothesis is presented that some of the several races have not been previously described.