230 MAINE AGRICULTURAL EXPERIMENT STATION. I913. 



growth. When the cultures were one month old examination 

 showed the presence of spores of different types. The most 

 abundant were obovate in shape and about 8 microns in diameter 

 but there were many septate spores 4 to 5.5 x 14 to 20 microns 

 and consisting of 2 or 3 cells. There were also non-septate 

 spores of the shape that usually occurs in cultures of Fusarium. 

 No long septate spores were o'bserved at this time. 



F III from apple does not make as great a growth on any 

 medium which has been used as the other forms from apples. 

 On the beet cylinder cultures four days old, the mycelium cov- 

 ered a little more than one-half of each slant. There was 

 very little aerial growth and this was white in color. No red 

 color ever appeared in these cultures, although occasionally a 

 little red color has been observed on other media. 



The growth of F IV from apple was identical in appearance 

 with what has been described for F II. Spores of the same 

 type were found in the cultures. 



Another fungus, F X, which was isolated from Red Astra- 

 chan apples which were decaying around the core had exactly 

 the same cultural characters on this medium as F II. 



The fungus, F XIII, from sunflower heads produced the 

 same amount of aerial growth, the same colors and the same 

 types of spores as the strains with obovate spores from apples. 



Strains of a fungus from potato, F IX, and sweet corn, F 

 VI, which produced hoth obovate and septate spores with a pre- 

 dominance of the obovate type were grown on this medium and 

 gave cultures which in color and amount of mycelium agreed 

 quite closely with the forms described above from apples and 

 sunflower. Comparisons showed, however, that the cultures 

 from apple and sunflower produced a larger proportion of sep- 

 tate spores than the similar fungi from other sources. 



The mycelium of F. putrefaciens,* F XII grown over the 

 entire surface of the slants when the cultures were 4 days old. 

 Not so much aerial mycelium had developed as in the forms 

 with obovate spores but about the same amount as in F I from 

 apple. The color differed from that in the Maine form, how- 

 ever, the red and yellow of the 'European fungus 'being dull in 

 comparison. The dull red color extended to the aerial mycelium 



* See foot-note p. 254. 



