86 



MANUAL OF BOTANY 



forms where two kinds of gametophyte are met with. The 

 fmigus producing Ergot [Clavicejys) is an example of this. The 

 first form consists of a feltwork of myceUmn, filling the ovary 

 of the Eye or Wheat plant, and giving rise by abstriction to 



Fig. 843. 



Fig. 844. 



sph 



Fig. 843. Young sclerotium, c, of Claviceps growing up and supplanting the 



old spliacelia, sph. Fig. 844. Section through the junction of the 



sphacelia with the sclerotium of Clavicejxs, showing formation of gonidia. 



Fig. 845. 



Fig. 846. 



Fig.Sib. Portion of the horn-shaped sclerotium of Claviceps purpntea, or the 



Ergot Fungus, bearing four stromata. Fig. 846. Longitudinal section of 



a stroma, magnified, showing the perithecia. After Tulasne. 



numbers of gonidia (Jig. 844). This form is known as the 

 Sjphacelia. Later in the year the mycelium becomes very dense 

 and hard, and protrudes from the ear as a black elongated body 

 which is known as a sclerotium {fig. 843). After a period of rest 

 extending through the winter, the sclerotium germinates, putting 



