SPHAERIALES 



167 



frequent lateral anastomoses occur and crystals of calcium oxalate, which 



have become separated from the substratum, are found among the filaments. 



Hyphae become massed together to form the stroma which in the 



very young stages consists entirely of vegetative filaments densely inter- 



Fig. 124. Xyiaria Hypoxyhn Grev., after Tulasne. 



woven and rising vertically from the surface of the substratum. As they 

 grow the stromata assume their characteristic shape, conid.a appear -and 

 drops of pinkish or yellowish fluid are exuded. When these dry up, black 

 dots indicating the position of the ripening perithecia are s 



