Fungous diseases of plants . The mycelia of both the blotch and the speck are superficial, atmost merely roughening the surface of the cuticle. The blotches are irregular in outline, sometimes ^^^^^^ coalescing into ^lir^SI^^^x^^^K^- *^^»? large areas. The specks, as the name^Vi-^v^-^ • indicates, are small, •? v::^ -:- circular, dark col- , ? ?-. « ored flecks associ- ated in groups, andsometimes distrib-uted over large?4^ ^^eas.^/ A network of ra- diating olive-brownor fuliginous hyphasmade up of more orless barrel-shapedcells constitute theOn the. i^ Fig. 187. Fly .Speck and Sooty Blo

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Fungous diseases of plants . The mycelia of both the blotch and the speck are superficial, atmost merely roughening the surface of the cuticle. The blotches are irregular in outline, sometimes ^^^^^^ coalescing into ^lir^SI^^^x^^^K^- *^^»? large areas. The specks, as the name^Vi-^v^-^ • indicates, are small, •? v::^ -:- circular, dark col- , ? ?-. « ored flecks associ- ated in groups, andsometimes distrib-uted over large?4^ ^^eas.^/ A network of ra- diating olive-brownor fuliginous hyphasmade up of more orless barrel-shapedcells constitute theOn the. i^ Fig. 187. Fly .Speck and Sooty Blotch of Apple blotch. Cell fusions and cell aggregations are commonother hand, the specks areat first dense aggregatesof rather light colored hy-phae, and from such specksdelicate hyphae may betraced to similar neighbor-ing spots or to mature speck becomesshining black and the central portionbreaks away and is pre-sumably the source of newinfections. No spore formhas been found accom-panying this phase. Both , ^^ r r 1 Fig. 188. Leptothyrwm Pomi: Develop- types 01 fungus have, ^ „ J ^ ° MENT OF PyCNIDIA FROM PyCNOSCLEROTIA however, been followed (Photograph by B. F. Floyd)

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