Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplants00tube Year: 1897 190 A8C0MYCETES. fertilise the trichogyiie and cause it to develop as an ascogoniuni. P. ochraceum (Wahlenb.) (P. fulinim Y). C.) causes yellowisli- I'fd spots on leaves of Primus Fadus. P. obscurum Juel. produces thickened leaf-spots on Astragalus alpinus and A. orohoides; on the under side these are whitish, on the upper side they show the spermogonia as red points. The damage caused by Polystigma

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Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplants00tube Year: 1897 190 A8C0MYCETES. fertilise the trichogyiie and cause it to develop as an ascogoniuni. P. ochraceum (Wahlenb.) (P. fulinim Y). C.) causes yellowisli- I'fd spots on leaves of Primus Fadus. P. obscurum Juel. produces thickened leaf-spots on Astragalus alpinus and A. orohoides; on the under side these are whitish, on the upper side they show the spermogonia as red points. The damage caused by Polystigma is easily kept in check liy burning infected leaves in autumn. Epichloe. The stromata form on the stems of grasses yellowish mould- like coatings in which the flask-shaped perithecia are embedded. Fio. S3,—EjHchlod lypUna, forming numerous white cushions, wliich completely encircle the grass-stems, (v. Tubeuf phot.) The asci are cylindrical, and contain eight thread-like unicellular

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