434 vSchneider: Chroolepus aureus a lichen 



Hxplanation of plate 22 ' 



^, Filaments of Chroolepus aureus^ showing the enclosing fungal meshwork 

 (a, b) and special algal filaments (c). 



By Long filaments of Chroolepus with the enclosing meshwork removed. 



C, Terminal portion of algal filament, more highly magnified. The extreme tip 

 is always free of the fungal symhiont. 



Z>, Basal portion of algal filament, showing the delicate meshwork (b) and the 

 twining filaments of a coarser hyphal fungus (a). 



E^ A portion of the fungal meshwork removed from the algal filament, showing 

 the characteristic reticulation. 



Magnification of A and B about 225 diameters, of C, D and E about 300 diameters. 



