SOSTO< . 



543 



the slime-canal into the idand it-elf, ami th.-i-' occupy the 

 space left hy tin- glandular cells mi their ci.n\ i-r-i<ni into -lime. 

 'I'hence the filaments find their way into tin- intercellular -] 

 >f tin- starch-containing parenchyma -urroundinu the uland, and 

 become clo-ely applied tu the cell-walls. The X' '.s/i then bores 

 through or dissohe.s the cell-wall, absorbs tin- starch, and grows 

 vigorously till it tills the whole cell. In this manner the 

 Xoxtoc spreads through the cortical parenchyma of the Gunnera 

 stem from cell to cell. The stem ^land- in course of time 

 become inactive and the canal closes up, so that the Nostoi i- 





Kii.. 3'J1. . A. C.ir:il-liki- snrl Prans- 



i A ; tin,- ilmilili; line- imliivi;- tinii 



"f tin: .'i Tul>ouf del.) 



>init in. In this condition it is absolutely de- 

 pendent on noiiri-hnient deriveil i'roin the lio>t-cell<. and seems 

 io thrive on it. No outward symptoms of di-ea-e can he 

 erved on Gunnera with enclosed Nostoc, iln- local destruction 



of the eell-colilellt-. the lo--, of starch, and the tillill- Up of 



the tissues with filaments of JV</.s/,/r having apparently no 



efl'eet. Tile BpeClCS of I 111,!, I, fit haVe U Vel'\ -llol't ,v|e|ll willl 



.1 growing point hanll\ lai^-d above the level of the -oil. 30 

 I hat the NostOC ea-ily finds its way there. No al-ae have 

 I'een loUlld in the petiole alld lalllilia of the -i-antic lea\e-. 



Gunnera ma\ -M-ily he eiilti\'ated althoii-h \\ contain- no 



-, .\,,,/,,c ,//<//,///<// as identical \\ith N, 

 1 .i-iii--' in. // '' .\ . i -! i 



Jonsson 



