. 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. viburni, Peck. Oii Viburnum ( America). PI. densa (Eabh.). Oii Scropliularineae (Britain). PI. ribicola (Schroet.). On Ribes rubrum ( America). PI. epilobii (Eabh.). On Epilobium pahistre, and E. parvifoliurii. PI. obducens (Schroet.). On cotyledons of Impatiens ( America). PI. geranii (Peck.). On Geraniums in America. PI. Halstedii, Berl. and de Toni. On Silphium, Rudheckia, Helianthus
. 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. viburni, Peck. Oii Viburnum ( America). PI. densa (Eabh.). Oii Scropliularineae (Britain). PI. ribicola (Schroet.). On Ribes rubrum ( America). PI. epilobii (Eabh.). On Epilobium pahistre, and E. parvifoliurii. PI. obducens (Schroet.). On cotyledons of Impatiens ( 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 graminicola (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 jj^ conidia are aljjointed 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. {Pcronospora gaiLgliuniformis Berk.^) (Britain and America). The richly-branched conidio- phores appear singly on attacked parts of plants. This fungus ' Cornu, Compt. rend., Fig. i2.—Bremia (v. Tubeuf 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 illustra
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