Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] MYXOGASTRES 533 Speedwell {Veroniia). The galls contain numerous spore- balls, each enclosed in a delicate membrane, and consisting of a single layer of elliptical spores enclosing a central cavity. The individual spores measure 8-9 X 4-4*5 1- Tetramyxa parasitica (Goeb.) forms little swellings on stalks, leaves, and flowers of Riippia rostdlata. The multi- nucleate Plasmodium breaks up into small portions, each con- taining a nucleus. Iliese portions afterwards divide into four
Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] MYXOGASTRES 533 Speedwell {Veroniia). The galls contain numerous spore- balls, each enclosed in a delicate membrane, and consisting of a single layer of elliptical spores enclosing a central cavity. The individual spores measure 8-9 X 4-4*5 1- Tetramyxa parasitica (Goeb.) forms little swellings on stalks, leaves, and flowers of Riippia rostdlata. The multi- nucleate Plasmodium breaks up into small portions, each con- taining a nucleus. Iliese portions afterwards divide into four spores, each containing a nucleus. The four spores remain joined together, enclosed in a delicate membrane. Spnmaria alba (D. C.) sometimes proves indirectly \x\]wx\- 6»V.:!'Vl|fc»v Fig. 161.—Fuligo variaiis. The Plasmodium has crept over the soil in a plant-pot, and formed its mass of spores, which are covered with a yellow crust of lime. Reduced. ous; its Plasmodium often creeps up the stems of living grasses, and forms spore-masses up to 2-3 inches in length and an inch in diameter. These are at first covered with a white crust, which soon falls away, exposing the soot-like mass of spores, which are globose, minutely warted, dusky purple or brownish, 10-13 /x diameter. When produced in considerable quantity, the dense masses of spores are said to injure vegetation by a process of suffoca- tion. It is not a parasite. Instances are also on record where horses and other
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