146 Bulletin 313 



FusARiuii LYCOPERSici Sacc. — In the fibro-vascular tissues of the 

 tomato. Causes a wilting of the plant. Mycelium hyaline and vari- 

 ously branched, conidiophore short and simple; conidia curv^ed, both 

 ends acute, 1-3 septate, hyaline becoming yellowish, 25-30 x 3.5-4 /x. 



854. Cross-section of fibro-vascular bundles showing mycelium, 1/6. 855. 

 Spores, 1/12. 856. Chlamydospores and mjxelium, 1/12. 



FusARiUM RUBi Winter. — In buds and blossoms of dewberries and 

 blackberries. Causes deformities of the buds and flowers commonly 

 known as "false blossoms'' or "double blossoms." The conidia are 

 produced in the opening flower buds ; they are variable in size and 

 form, straight or curv^ed, 1-8 septate, 14-30 x 3-3.5 fi. 



857. Spores, 1/12. 



FusARiUM sp. (= Nectria ipomoca, page 36). 



ScLEROTiUM RHizoDES Auersw. — On Calamagrostis canadensis 

 and other grasses. Causes leaves to become dr}', rigid and bent into 

 characteristic crooks. Felty gro\\iJis of mycelium appear on the 

 leaves and give rise to sclerotia. Sclerotia at first white and woolly. 

 Described by Stout as follows : 



"ScLEROTiUM RHIZODES. — Sclcrotia on host plant are rounded and 

 smooth on their entire surface except on the side which was ap- 

 pressed to the leaf and here the Sclerotium is usually flattened and 

 rugose to conform to the ridges in the surface of the leaf." 



858. C. canadensis infected with Sclerothim rhizodes, showing sclerotium 

 and characteristic shepherd's crooks. 



