288 



MANUAL OF POISONOUS PLANTS 



Fig. 104. Wheat Scab (Gibberella Saubinctii), perfect form of Fusarium roseum I. 

 1. Wheat affected with wheat scab, upper portion destroyed. 2. Glumes covered with 

 perithecia. 4. Perithecia. 5. Asci from perithecia with ascospores, one of these enlarged 

 at 6. 7. Conidiophore and spores grown in agar. After Selby. 



Fiisariuni roseum, Link 



Mycelium whitish or varj-ing from }'ellow to orange, appearing at the 

 time when the grain begins to turn ; the head, or part of it, has a whitish 

 appearance and the chaff is glued together; conidiophorcs branched, spores 

 terminal or lateral, crescent shaped at first, 1-celled, finally 2 or more celled; 

 color of the conidia white or in masses orange or pink. According to Saccardo 

 the ascigerous stage is the Gibberella Saubineitii (Mont.) Sacc. with gregari- 

 ous perithecia, coriaceous, or somewhat membranaceous ; somewhat blackish 

 in color, asci oblong, lanceolate, ascospores fusiform, 3-celled. Definite cul- 

 tural experiments have not been made in this country to determine the relation 

 of this fungus to the F. heterosponim. 



According to Burrill and Barrett * several forms of Fusarium occur on 

 corn. Saccardo in a letter to the writer identified the common Iowa Fusarium 

 on corn as F. heterosponim. 



The Fusarium hctcrosporum Nccs, is common in parts of Germany, and 

 Tubeuf quotes Frank as stating that the destruction of rye is total in some 



* Bull. III. Agrl. Exp- Sta. 133. 



