. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. PLASMOPARA. 131 PI. vibumi, Peck. On Viburnum ( America). PI. densa (Eabh.). On Scrophularineae (Britain). PI. ribicola (Schroet.). On Ribes ruhrum ( America). PI. epilobii (Eabh.). On Epilobium palustre, and S. parvifolium. PI. obducens (Schroet.). On cotyledons of Impatiem ( America). PI. geranii (Peck.). On Geraniums in America. PI. Halstedii, Berl. and de Toni. On Silphium, Rudheckia, Helianthus, and
. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. PLASMOPARA. 131 PI. vibumi, Peck. On Viburnum ( America). PI. densa (Eabh.). On Scrophularineae (Britain). PI. ribicola (Schroet.). On Ribes ruhrum ( America). PI. epilobii (Eabh.). On Epilobium palustre, and S. parvifolium. PI. obducens (Schroet.). On cotyledons of Impatiem ( America). PI. geranii (Peck.). On Geraniums in America. PI. Halstedii, Berl. and de Toni. On Silphium, Rudheckia, Helianthus, and many other American Compositae. Sclerospora. Mycelium intercellular in living plant-tissues, and deriving nourishment by means of haustoria. The conidiophores are thick, short, and divide at their apices into short broad branches, from each of which a single conidium is abjointed. The conidia in germinating discharge swarming cells. One oospore is formed in each oogonium. Sclerospora ^aminicola (Sacc.) lives in several species of Setaria ( America). Bremia. Mycelium intercellular in higher plants, and nourished by little button-like haustoria. The conidiophores are branched, and at their apical ends become swollen in a char- acteristic manner, so as to resemble a hand held cup- like with the fingers project- ing separately upwards, like the tentacles of Hydra. The conidia are abjointed singly from the tentacle-like pro- cesses, and germinate, emit- ting a germ-tube through a definite thin spot in their coat. Oospores originate singly in oogonia. Bremia lactucae, Eeg. {Peronospora ganglioniformis ) (Britain and America). The richly-branched conidio- phores appear singly on attacked parts of plants. This fungus ^Cornu, Compt. rend., Fig. ii.—Bremia lactucae. (v. Tuteuf del.). 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
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