. A monograph of the British Uredineae and Ustilagineae, with an account of their biology including the methods of observing the germination of their spores and of their experimental culture. Smut fungi; Rust fungi; Smut diseases; Fungi. 8o British Uredinecs and Usiilaginecs. abundantly. As the teleutospores are of pretty large size, their germination is easily observed. I have found them germinate much more freely in summer than in late autumn (Plate VII. Fig. 18). U. tragopogi (Pers.) {U. receptaculorum, Fries).—The germination was observed by Tulasne,* and by Von Wald- to consist in
. A monograph of the British Uredineae and Ustilagineae, with an account of their biology including the methods of observing the germination of their spores and of their experimental culture. Smut fungi; Rust fungi; Smut diseases; Fungi. 8o British Uredinecs and Usiilaginecs. abundantly. As the teleutospores are of pretty large size, their germination is easily observed. I have found them germinate much more freely in summer than in late autumn (Plate VII. Fig. 18). U. tragopogi (Pers.) {U. receptaculorum, Fries).—The germination was observed by Tulasne,* and by Von Wald- to consist in the protrusion of a promycelium through a very marked germ-pore in the epispore. It becomes three or four-septate, and pro- duces subcylindrical promycelial spores, which are rounded, especially at their distal ends. These often grow nearly parallel to the promycelium, as figured by Von Waldheim; sometimes they are produced terminally upon branches , ?'s- ^—ustiiago trago- given off from the segments of the pro- pogi. Teleutospjre germi- ° . " ^ ?otu|£|.'TTuTisne!r" mycelium. Conjugation often takes place between them after they have fallen off. In nahrlosung Brefeld | found them to be abun- dantly reproduced by budding, but they were larger, mea- suring from S to 20/x in length, and from 5 to 7(U in breadth. U. kuhneana, Wolff.—The promycelium is three to four- septate, the lowermost compartment being the longest and empty. It produces numerous promycelial spores in whorls at each septum (Plate VII. Fig. 17). In nahrlo- sung § they budded very profusely, forming very character- istic small yeast-spores, from 3 to 5(U long, and from 3 to Sju wide. Wolff || also investigated the germination in water. U. ^j//oi5^to(Schlecht.).—The germination of this plant * Tulasne, "2° M^moire," pp. 159-160, t. xii. figs. 34-40. t P'. von Waldheim, loc. cit., t. xi. figs. 27-37. % Brefeld, loc. cit., pp. 81, 82, t. v. figs. 7-11. § Brefeld, loc. cit., pp. 83-88,
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectfungi, booksubjectsmu
