. Fig. 105.—Urocystis colchici. i, portion of infected leaf ; 2, a single sorus, slightly mag. ; 3, spores, highly mag. ColcMcium smut {Urocysiis cokhici, Rab.) forms long rows of black, powdery streaks on the leaves of colchicum— Colchiaun autum/ta/e, Muscari racemosu/n, M. comosum, Scilla Infolia, Allium rotundi/m, A. cepa, A. tnagiatm, and Paris quadrifolia. Spore-clusters globose or oblong, 20-33 X 16-20/x; central fertile spores chestnut-brown, sterile peripheral cells pale yellowish-brown, small. Gladiolus smut {Urocystis gladioli, Smith) sometimes attacks the corms of cultivated kinds o

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. Fig. 105.—Urocystis colchici. i, portion of infected leaf ; 2, a single sorus, slightly mag. ; 3, spores, highly mag. ColcMcium smut {Urocysiis cokhici, Rab.) forms long rows of black, powdery streaks on the leaves of colchicum— Colchiaun autum/ta/e, Muscari racemosu/n, M. comosum, Scilla Infolia, Allium rotundi/m, A. cepa, A. tnagiatm, and Paris quadrifolia. Spore-clusters globose or oblong, 20-33 X 16-20/x; central fertile spores chestnut-brown, sterile peripheral cells pale yellowish-brown, small. Gladiolus smut {Urocystis gladioli, Smith) sometimes attacks the corms of cultivated kinds of Gladiolus in this country. The spore-balls average 40-50 /x diam. The central fertile spores are dark brown, angularly globose, smooth, 4-6 /x diam., sterile peripheral cells numerous, pale. Destroy infected corms, as cure is out of question.

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Keywords: ., bookpublishernewyorkmacmillan, booksubjectplantdis, bookyear1910