Fungi, Ascomycetes, Ustilaginales, Uredinales . r ig. 176. Puccinia Graminis Pers.; a. infected leaf of Bcrberis vulgaris,nat. size: />. group of aecidia, x 5. Uromyccs Poat Kabenh.; leaf of Ranun ultis ficaria, nat. size; d. group of aecidia,x 20; E. J. Welsford del. mother-cell (fig. 178). The spore mother-cell divides in the usual way,separating the aecidiospore above from its sister-cell below, but the latterhere forms an elongated stalk instead of an intercalary cell. Each outgrowthof the basal cell thus produces only a single spore, the mode of formationof which is exactly

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Fungi, Ascomycetes, Ustilaginales, Uredinales . r ig. 176. Puccinia Graminis Pers.; a. infected leaf of Bcrberis vulgaris,nat. size: />. group of aecidia, x 5. Uromyccs Poat Kabenh.; leaf of Ranun ultis ficaria, nat. size; d. group of aecidia,x 20; E. J. Welsford del. mother-cell (fig. 178). The spore mother-cell divides in the usual way,separating the aecidiospore above from its sister-cell below, but the latterhere forms an elongated stalk instead of an intercalary cell. Each outgrowthof the basal cell thus produces only a single spore, the mode of formationof which is exactly similar to that of a uredospore. The fructification hasgenerally been regarded as a uredosorus and is known as the primaryuredosorus, in reference to its appearance relatively early in the season.

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfungi, bookyear1922