2 



BOTANICAL GAZETTE 



[JULY 



lack aecidia. Of the first group, 2 species have aecidia of the cup 

 type and 5 have aecidia of the caeoma type; while the remaining 

 2 have primary uredosori that have been shown to be functional 

 aecidia. The 2 forms that lack aecidia are short-cycled micro- 

 forms. Of these 11 species, 10 are autoecious and one (Melampsora 

 Rostrupi) is heteroecious. 



TABLE I 

 Summary of fertilization phenomena 



Species 



Author 



Date I Length of cycle iType of aecidium Method of fertilization 



Phragmidium 



violaceum. . . . 

 Phragmidium 



speciosum. . . . 

 Melampsora 



Rostrupi 



Phragmidium 

 Pot. canadensis 

 Caeoma nitens. . 

 Triphragmium 



Ulmariae. . . . 

 Puccinia 



transformans . 

 Caeoma nitens. . 

 Puccinia 



Falcariae .... 



Endophyllum 

 Sempervivi. . . 



Melampsora 

 Lini 



Puccinia 



Malvacearum 



Blackman 



Christman 

 Blackman 

 and Fraser 



Christman 

 Olive 



1904 



Olive 



1905 

 1906 



Olive 

 Kurssanow 



Dittschlag 

 Hoffman 



Fromme 

 Werth and 



Ludwigs 



1907 

 1908 



1908 



1908 

 1910 



1910 



1912 



1912 



!9i3 



o, I, II, III 



o, I, III 



o, I, II, HI 



o, IISIPJII 



o,I(?) 



o 9 n%n*,m 



0,111 

 0,1 (?) 



o, I, III 



0,1 



o, I, II, III 



(o?),III 



Caeoma 



Caeoma 



Caeoma 

 Primary 



uredo 

 Caeoma 

 Primary 



uredo 



Caeoma 



Cup 

 Cup 

 Caeoma 



Nuclear 



migrations 

 Equal cell fusions 

 Equal cell fusions 



Equal cell fusions 

 Equal cell fusions 



Equal cell fusions 



Equal cell fusions 

 Equal cell fusions 



Equal cell fusions 



Equal cell fusions 



Equal cell fusions 



Equal cell fusions 



In 10 of the cases reported the fertilization processes described 



com 



ametes 



Christman 



'P 



remaining 



violaceum, as described by Blackman, two cells are also involved 



mo 



unequal and complete cell fusion was not observed. Nuclear 



mi 



VCKMAN 



Christ 



Kl 



pathological phenomena. The 10 cases of equal cell fusions are 

 described by 7 different authors, and none of these has found true 



