990 Wisconsin Academy of Sciences , Arts, and Letters. 
acid. It crystallizes from ethyl acetate in nearly colorless 
prisms melting at 199 °C. It is soluble in methyl alcohol, dif¬ 
ficultly soluble in ether, carbon disulphide and alcohol, readily 
soluble in warm benzene, chloroform, ethyl acetate, acetone and 
amyl alcohol. 
Filmaron. 25 Filmaron (C 47 H 52 0 16 ) is a light yellow, amor¬ 
phous powder melting at about 60°C. It is insoluble in water, 
difficultly soluble in alcohol, methyl alcohol and petroleum ether, 
readily soluble in acetone, chloroform, ether, ethyl, acetate, 
benzene, carbon disulphide, carbon tetrachloride, amyl alcohol 
and glacial acetic acid. In acetone solution, at ordinary tem¬ 
peratures. or upon warming with alcohol, it gradually decom¬ 
poses into filix acid and filixnigrin. The following structural 
formula has been suggested by Kraft: 
II, Cn. .xh 3 
<r 
Filixnigrin , 26 Filixnigrin is the term used by Kraft to desig¬ 
nate the mixture of brown to black amorphous decomposition 
products of the foregoing constituents. These decomposition 
products differ from the mother substances in that they are in¬ 
soluble in petroleum ether. They have been isolated from the 
etheral extract. To what extent they occur in the plant, if at 
all, has not been determined. 
Chlorophyll. The green coloring matter of the male fern 
rhizome and of the oleoresin prepared therefrom is generally 
conceded by the various investigators to be chlorophyll, al- 
25 Kraft, 1. c. 
28 Kraft, l. c. 
