Fungi, Ascomycetes, Ustilaginales, Uredinales . Fg- 45- Phyllactinia Corylea (Pers.) Karst.; peri-thecium containing uninucleate asci;after Harper. Fig. 46. Phyllactinia Corylea(Pers.) Karst.; a. b. fusion inascus; after Harper. Eight chromosomes (fig. 47) have been observed throughout the life-history. In Phyllactinia Corylea and also in Microsphaera AIni(Sands, 1907) andvarious species of Erysiphe (Harper, 1905), the organization of the restingnucleus is very characteristic. A deeply staining central body lies againstthe nuclear membrane and to this the chromatin threads are it
Fungi, Ascomycetes, Ustilaginales, Uredinales . Fg- 45- Phyllactinia Corylea (Pers.) Karst.; peri-thecium containing uninucleate asci;after Harper. Fig. 46. Phyllactinia Corylea(Pers.) Karst.; a. b. fusion inascus; after Harper. Eight chromosomes (fig. 47) have been observed throughout the life-history. In Phyllactinia Corylea and also in Microsphaera AIni(Sands, 1907) andvarious species of Erysiphe (Harper, 1905), the organization of the restingnucleus is very characteristic. A deeply staining central body lies againstthe nuclear membrane and to this the chromatin threads are it they extend into the central cavity of the nucleus forming a sheafof divergent rays connected laterally by delicate fibrillae (fig. 46). Ill] ERYSIPHALES 89 In Phyllactinia there is evidence that the number of main strandscorresponds to the number of chromosomes, and that, in fact, these persist. Fig. 47. Phyllactinia Corylea (Pers.) Karst.; a. metaphase of first division in ascus; b. ana-phase of fust division; c. anaphase of second division in ascus; d. anaphase of thirddivision ; after Harper. throughout the resting stages that intervene between successive divisions,and fuse in pairs after nuclear fusion. ERYSIPHACEAE: BIBLIOGRAPHY 1895 Harper, R. A. Die Entwickelung des Peritheciums bei Sphaerotheca Castagnei. Her. d. deutsch. Bot. Gesell. xiii, p. Harper, R. A. Ober das Verhalten der Kerne bei der Fruchtentwickelung einiger Ascomyceten. Jahrb. fiir wiss. Bot. xxix, p. DANGEARD, P. A. Second memoire sur la production sexuelle des Ascomycetes. I c li. , v, p. Harper, R. A. Kernteilung und freie Zellbildung im Ascus. Jahrb. fur wiss. lint. xxx, p. Salmon-, E. S. A Monograph of the Erysiphaceae. Mem. Torrey Hot. Club, ix, p. N EGER, F. W. Neue Beobachtungcn iiber das spontane Freiwerden der Erysipheen- fruchtkorper. Centr. f
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfungi, bookyear1922
