1914] 



FROMME—AECIDIUM CUP 



5 



caeoma of Melampsora Lini. This form differed in structure from 

 previously described caeomas in that two sterile cells were normally 

 produced above each gamete. Equal cell fusions were found in 

 abundance. A number of three and a few four-cell fusions were 

 found, and these gave rise to chains of three and four-nucleated 

 aecidiospores and intercalary cells. Multinucleated cells, whose 



determined, were also found among 



spore chains. 



TABLE II 

 Plurinucleated cells 



Author 



Sappin-Trouffy 



Blackman and Fraser. . 



Blackman and Fraser. . 

 Blackman and Fraser. . 



Blackman 



Olive 



Dittschlag 



Hoffman 



Fromme 



Date 



1896 

 1906 



1906 

 1906 



1904 

 1908 



Rust 



No. of nuclei 

 to a ceil 



1910 



1911 



1912 



Ur. Betae 



P. Malvacearum 



Ur. Ficariae 

 P. Poarum 



Ph. violaceum 

 P. Cirsiil-anceolati 



P. Falcariae 



Endo. Sempervivi 



Mel. Lini 



4 



3 



3 



3 and 4 



3 

 Up to 15 



3 



3 



3 and 4 

 3, 4, and 11 



Kind of cell 



Uredospore 

 Teleutospore 

 basal cell 



and 



Teleutospore 

 Aecidiospore 



initial cell 

 Basal cell 

 Cell at base of 



aecidium 

 Aecidiospores 



and basal cells 

 Aecidiospores 



and basal cells 

 Aecidiospores 



Basal cells 



Werth and Ludwigs (28) studied the teleutosorus of the micro 



form Piiccinia Mai 



They found cell fusions between the 



tips of club-shaped hyphae. The fusing cells were usually of 

 unequal size and the nucleus of the smaller passed over into the 

 larger. This binucleated cell cut off two cells, the lower of which 

 became the stalk, and the upper, after a division, the two-ceiled 

 teleutospore. They occasionally found binucleated cells in the 

 vegetative tissue and were unable to explain their presence. 



some 



interest, since the uninucleated and binucleated condition seems to 

 be very constant in the gametophytic and sporophytic mycelium, 

 respectively. A number of instances of plurinucleated cells that 

 have been figured bv various authors are tabulated in table II. 



