109 



several other genera: Botrytis (Beauverie and Guilliermond, 13); Alter- 

 naria, Epicoccum, and Botrytis (Linder, 78); Inzengaea (Borzi, 23); De- 

 matium, Botrytis, Oidium (Klocker and Schiorming, 75); Chaetomium 

 (Zopf, 129, figs. 24, 25, A, B, Tab. 16). The phenomenon, as described, 

 is always associated with senescence. Sclerotia are described by Bakke 

 (6) and by Noack (87) , who seem to have found them common on old straw- 

 cultures, varying in length from 200 to 600 /*. I have not found them at all 

 on straw, though on old rice-cultures they are abundant. Pycnidia and 

 pycnoconidia, as seen by Ravn (91) in H. teres and as described by Bakke 

 (6), I have not seen. 



CONIDIOPHORES 



On standard wheat- shoots. The conidiophores are in no sense clustered 

 but arise singly as lateral branches, each from an ordinary mycelial cell, 

 and differ from the mycelium chiefly in that they grow erect and straight 

 instead of declined and crooked, and are darker in color than the mycelium. 

 Usually this branch in its basal region is mycelium-like, but it rapidly 

 thickens and darkens to true conidiophore character, and is usually 2.5 to 

 5 n in length. Sometimes the mycelial cell from which the conidiophore 

 arises also darkens. The conidiophore-cells contain protoplasm, and the 

 protoplast plasmolizes under the usual reagents. When mature the conid- 



FIG. 8. H. No. 1, showing variation in conidiophores, geniculation, 

 conidia-scars, and septation. 



