. Fig. 166. — Clover leaf showing sori of rust. Original. later in the season. They are recognized by their darker brown color. The cluster-cup stage, which is less abun- dant and less injurious than the other stages, may often pass unnoticetl. It appears first as pale swollen regions upon the leaf or petiole. These regions soon show the characteristic cups with orange-colored spores. The cluster- cup stage, though not known on red clover, predominates

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Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1910, bookyear1910