. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. PHRAGMIDIUM. 363 On species of Potentilla: Phr. fragariastri (D. C.) (Britain and America). Phr. potentiUae (Pers.) ( America). Phr. tormentillae Fuck. (Britain.) Phr. papillatum Dietel, from Siberia. Phr. nepalense Barcl. and Phr. laceianum Barcl. in India. On species of Bubus: Phr. rubi (Pers.) {Phr. bulbosum Schlecht.) (Britain). Phr. rubi-idaei (Pers.). On leaves of raspberry. (Britain and America.
. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. PHRAGMIDIUM. 363 On species of Potentilla: Phr. fragariastri (D. C.) (Britain and America). Phr. potentiUae (Pers.) ( America). Phr. tormentillae Fuck. (Britain.) Phr. papillatum Dietel, from Siberia. Phr. nepalense Barcl. and Phr. laceianum Barcl. in India. On species of Bubus: Phr. rubi (Pers.) {Phr. bulbosum Schlecht.) (Britain). Phr. rubi-idaei (Pers.). On leaves of raspberry. (Britain and America.) Phr. violaceum (Schultz) (Britain). Phr. rubi-miniatum J. Miill. Phr. albidum (Kiihn). Phr. quinqueloculare Barcl. Phr. octoloculare Barcl. Phr. Barclayi Dietel, from Hima- laya. Phr. gracile Pari., America. And other species. On Sanguisorba: Phr. san^isorbae (D. C). On Sanguisorba minor. (Britain.) Phr. carbonarium (Schlecht.) (Britain). This species has also been placed in a separate genus Xenodochus. It occurs on San- guisorba. TJredospores are want- ing ; the teleutospores form firm black crusts; the aecidiospores form chains ; and the paraphyses are club-shaped. Diseased leaves and petioles are thickened and bent. Wakker's investigation showed: a slight enlargement of parenchymatous cells and rupture of epidermis on spore-formation; a diminution in the intercellular spaces and in formation of collenchyma and sclerenchyma; a suppression of all production of chlorophyll and calcium Fig. 195.—Phragmidium rubi from Ruhus iruticosus. One spherical immature te- leutospore, and two well-developed and germinating ones. (After Tulasne.) Melampsora. Teleutospores dark and unicellular, in some cases multi- cellular by formation of new walls, generally in a vertical. 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 perfectly resemble the or
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