. The fungi which cause plant disease . Plant diseases; Fungi. 314 THE FUNGI WHICH CAUSE PLANT DISEASE spore-balls black, opaque, oblong to spherical or polyhedral, usually containing one hundred or more firmly agglutinated spores, chiefly 50-180 M in length; spores from nearly hyaline, to light reddish- brown, outer coat more or less folded in ridges, often spiny, ovoid to subspherical or polyhedral, chiefly 7-10 n or rarely 12 /x in Fio. 229.—^Tolyposporium. Spore length. ball germination. After Brefeld. ^ t. • n- • ii^ On Panicum crus-galh m the United States east of the Rocky Mountains als
. The fungi which cause plant disease . Plant diseases; Fungi. 314 THE FUNGI WHICH CAUSE PLANT DISEASE spore-balls black, opaque, oblong to spherical or polyhedral, usually containing one hundred or more firmly agglutinated spores, chiefly 50-180 M in length; spores from nearly hyaline, to light reddish- brown, outer coat more or less folded in ridges, often spiny, ovoid to subspherical or polyhedral, chiefly 7-10 n or rarely 12 /x in Fio. 229.—^Tolyposporium. Spore length. ball germination. After Brefeld. ^ t. • n- • ii^ On Panicum crus-galh m the United States east of the Rocky Mountains also in Europe. T. filiferum and T. volkensii, occur on sorghum in Africa. TiUetiaceae (p. 302) Sori either forming dusty erumpent spore-masses or permanently embedded in the tissues. Germination by means of a short promy- celium which usually gives rise to a terminal cluster of elongate sporidia, that, with or without fusing in pairs, produce similar or dissimilar secondary sporidia or germinate directly into infection threads. The American TiUetiaceae embrace nine genera and about one hundred twenty-five species. Key to Gexeea of TiUetiaceae Spores single Sori dusty at maturity Spores without a conspicuous hyaline appendage 1. Tilletia, p. 315. Spores with an elongate hyaline append- age 2. Neovossia. Sori permanently embedded in the tissues Sori definite, small 3. Entyloma, p. 320. Sori indefinite, large 4. Melanotsenium. Spores in balls Sori dusty; spore-balls with sterile cor- tex 5. Urocystis, p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stevens, Frank Lincoln, 1871-1934. New York : Macmillan
Size: 1656px × 1509px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
