250 INTRODUCTION TO THE STUDY OF FUNGI 



bodies it may be urged that the globose form, and absence of 

 movement, are unusual with known spermatia. And again, 

 the fact of their power of germination, or rather of budding, is 

 opposed to their possessing the function of spermatia. Cornu 

 found that the so-called spermatia budded in the manner of 

 Saccharomyces. In saccharine solutions they behave in a very 

 similar manner to yeast spores, or* analogous to the concatenate 

 production of cells in the Ustilagineae. 



It has also been suggested that in the aecidium stage the 

 conjugation of two swollen hyphae of the mycelium takes place, 

 from which the whole aecidial cup is produced as the result of 

 a sexual act. This again requires careful confirmation before 

 it can be accepted as more than a hypothesis. In the subse- 

 quent stages of uredospore and teleutospore no sexual act has 

 been discovered, and at present we are bound to admit that in 

 the Vredineae sexuality has not been proven. 



BIBLIOGRAPHY 



De Toni, J. B. "Sylloge Uredinearum," in Saccardo, Sylloge Fungorum, vol. 



vii. pt. ii. Padua, 1888. 

 Ploweight, C. B. A Monograph, of the British Uredineae and Ustilagineae. 8vo. 



London, 1889. 

 Db Bary, A. Untersuchungen liber die Brandpilze. 8vo. 1853. 

 Smith, "W. G. Diseases of Field and Garden Crops. 12mo. Cuts. London, 1884. 

 Ungee, F. Die Exaniheme der Pfianzen. 8vo. Vienna, 1833. 

 Cooke, M. C. Bust, Smut, Mildew, and Mould. 12mo. Col. plates- London, 



1870. 

 Dietel, P. Beitrage zur Morphologie und Biologie der Uredineen. 1887. 

 Scheoter, J. "Die Brand- und Rostpilze Schlesiens," in Abhand. der Settles. 



Gesell. 1869-72. 

 Winter, Geo., in Rabenhorst's Kryptogamen Flora — Pilze. 8vo. Cuts. 1884. 

 Leveille, J. H. "Sur la disposition des Uredines." Ann. des Sci. Nat., 3rd 



series, vol. viii. Paris, 1847. 

 Faelow, W. G. " The Gymnosporangia or Cedar Apples of the United States. " 



Mem. Boston Soc. Nat. Hist. 8vo. Boston, 1880. 



