Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 174 ASCOMYiJETKS. Sph. epilobii Lk. occurs on Epilohiiim ( America). Sph. Niesslii Tliiini. on Sorbus {Pyrns) Aria. Sph. pruinosa ('. et Pk. on Ithun in America. j2Q0QDo Fio. 71.—Sphacrotheca castagnei. Epiphytic mj-celium on epidermis of S/ni-aea Ubnaria. Three haustoria are embedded in epidermal cells. Two conidiophores are shown, from one of which a conidium has become detached. A hair of Si
Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 174 ASCOMYiJETKS. Sph. epilobii Lk. occurs on Epilohiiim ( America). Sph. Niesslii Tliiini. on Sorbus {Pyrns) Aria. Sph. pruinosa ('. et Pk. on Ithun in America. j2Q0QDo Fio. 71.—Sphacrotheca castagnei. Epiphytic mj-celium on epidermis of S/ni-aea Ubnaria. Three haustoria are embedded in epidermal cells. Two conidiophores are shown, from one of which a conidium has become detached. A hair of Si>iraea is sliowu at one side. (v. Tubeuf del.) Podosphaera. This genus is distinguished from Sphacrothcca by its upright perithecial appendages, which branch dichotomously towards their extremities. Podosphaera oxyacanthae D. C. Apple powdery mildew, also occurring on pear {Fijrus), hawthorn (Crataegus), mountain ash {Pyrus Ancuparia), and medlar {Mcspilus). In America this disease is very injurious to It attacks chietly young seedling plants, stunting their growth and causing them to lose their leaves. P. tridactyla Wallr. This causes injury to leaves of various species of Primus (cherry, plum, and sloe) (Britain and America). -Accoimt by M. B. Waits { Department of Agriculture, Report for 1888); notes on treatment in Fairchilcl's experiments [Journal of Mycolorjy, vii. p. 256), and elsewliere (Edit.). 3 Halsted Zeitschrift f. PJlanzenkrankheiten, 1895, p. 338) gives as additional liosts; Apple, Crataegits Oxyacantha, Amelanchier canadensis and Spiraea (Edit.).
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