GRASSES OF IOWA. 



201 



GIBBELLINA CEREALIS, PASS. 



Passerini,* who described this fungus in 1886, states that it 

 was very destructive. Later Cavaraf published an extended 

 account of the fungus and has given us the details of its life 

 history. Loverdot likew se describes it. The culm of affected 

 plants is very weak and does not produce fruit. The culm 

 above the first node above the ground shows a grayish-brown 

 circular spot. Later these spots lengthen and become conflu- 

 ent. The spots are covered with a mouldy mycelium which 



Fig. 92. Stem hUght, Oibbellina cereaZis ; a, general appearance; b, asci with asco- 

 pores and paraphyses; c, stroma, mycelium and peritheolum. (Oavara.) 



♦Bol. de Oomiz. Agr, Farm. 1886: 



tUeber elnlgeparasltische Pilze. Zelt. f. Pflanzenk. 3. 16. 



tLes Maladies. Orypt. 225. 



