DILOPHOSPORA 



427 



DILOPHOSPORA (DESM.) 



Perithecia crowded, immersed in a crustaceous weft 

 of hyphae or stroma; spores fusiform, septate, hyaline, 

 furnished at each end with several simple or branched, 

 delicate hairs. 



Wheat ear fungus (Dilophospora gramim's, Desm.) some- 

 times attacks ears of wheat and arrests the development of 



FIG. 132. Cylindrosporiumpadi. i, spots caused by fungus on a plum leaf ; 

 2, section through a pustule of conidia of same ; 3, conidia of Exosporium 

 tiliae ; 4, conidium of Sporodesrnium brassicae ; 5, Helminthosporium gram- 

 inum on barley leaf ; 6, conidia of same ; 7, Actinomena rosae on rose 

 leaf; 8, single blotch of same, showing perithecia ; 9, conidia of same; 10, 

 conidiophores of Cercospora resedae; n, single conidium of same. Figs. 

 i, 5, and 7 about nat. size ; remainder highly mag. 



the grain by forming a blackish-brown, crust-like weft, which 

 involves a portion or sometimes the whole of the ear. The 

 inflorescence of various other grasses, as species of Festuca 

 Triticum, Alopecurus, etc., are also attacked. The inflores- 

 cence is sometimes very much contorted, at others times it 



