SEXUAL REPRODUCTION 65 



Brefeld, Schimmelpilze, i. 



Brefeld, Landw. Jahrb., 5 (1876). 



Biisgen, Pringsh. Jahrb., 13. 



De Bary, Fung., Mycet., and B act. (Engl. ed.), p. 61. 



De Bary and Woronin, Beitr., i. 



Fischer, Phy corny cetes Rabenh. Kr. FL, 295 (1892). 



Guilliermond, Rev. Gen. Bot., 16, p. 129 (1904). 



Harper, Ann. Bot., 13, p. 467 (1899). 



Ikeno, Flora, 88, p. 229 (1901). 



Leger, Recher. sur la struct, des Mucorinees, 1896 

 (Poitiers). 



Rothert, Ber. d. deutsch. Bot. Ges., u, p. 286 (1894). 



Swingle, U.S. Dept. Agr., Bull. 57. 



Thaxter, Bot. Gaz., 24, p. i (1897). 



Thaxter, Bot. Gaz., 20, p. 484 (1895). 



Wager, Ann. Bot., 10, p. 295 (1896). 



Ward, Phil. Trans. Roy. Soc.\ Ser. B. 191, p. 269 

 (1899). 



SEXUAL REPRODUCTION 



Recent research has demonstrated the existence of what 

 appear, at first sight, very different modes of sexual repro- 

 duction in fungi, and although these diverse modes are 

 being to some extent linked up by the discovery of inter- 

 mediate conditions, yet our knowledge is too limited in 

 this direction to serve as the basis of a phylogenetic 

 classification. 



If we accept Brefeld's idea as to the evolution of the 

 fungi, commencing with the algae-like Phycomycetes, from 

 which descended the Ascomycetes, and finally the Basidio- 

 mycetes, there is an evident reduction of the sexual mode 



