118 Bulletin 313 



Septocylindrium aromaticum Sacc. — On the leaves of Acorus 

 calamus. Causes oblong, somewhat irregular, brown spots on both 

 surfaces of the leaf. Conidiophores fasciculate, short, white, coni- 

 dia cylindrical, rounded at the ends, denticulate at one end, hyaline, 

 non-septate or 1 to 3-septate, not constricted, 35-50 x 2-3 fi. 



721. Infected tip of leaf of Acorus calamus. 722. Conidiophores and coni- 

 dia, 1/12. 



Septocylindrium concomitans (Ell. & Hals.) Hals. — On tlie 

 leaves of Bidens frondosa. Causes oval or irregular, pale bro\\'Ti 

 spots with purplish border which is more prominent on upper than 

 lower surface, 2-4 mm. in diameter. Conidiophores fasciculate, 

 short; conidia cylindrical with acute ends, non-septate or 1-2 sep- 

 tate, 15-22 X 3-4 /A. 



723. Infected leaf of Bidens frondosa. 72A. Conidiophores and conidia, 1/12. 



Ramularia armorace^ Fcl. — On the leaves of horse-radish. 

 Causes subochraceous spots which become gray with age. Conidio- 

 phores fasciculate, continuous, sub-simple, 40-50 x 2.5-3 ix; conidia 

 rod-shaped, obtuse, hyaline, 15-20 x 3-4 /u,. 



725. Conidiophores and spores, 1/12. 



Ramularia arvensis Sacc. — On the leaves of Potentilla mon- 

 speliensis. Causes small, subcircular, white spots with reddish mar- 

 gins. Conidiophores fasciculate, denticulate, 1-septate, hyaline; coni- 

 dia more or less cylindrical, sometimes wavy in outline, one end 

 sometimes swollen or knobbed, non-septate or 1-septate, 22-26 x 

 2-5.4 fjL. 



726. Infected leaf of Potentilla monspeliensis. 727. Conidiophores and 

 conidia, 1/12. 



Ramularia desmodii Cke. — On the leaves of Meibomia. Causes 

 pale yellow spots. Conidiophores primarily in irregular patches, lim- 

 ited by the veinlets, non-septate or 1-2 septate, hyaline, 50-80 x 3-4 /i,; 

 conidia oblong or clavate-oblong, straight or slightly curved, 1-, 

 rarely 2- or 3- septate, hyaline, 12-24 x 3.5-4 fj.. 



728. Conidiophores and conidia, 1/12. 



Ramularia plantaginis E. & M. — On the leaves of Plantago lan- 

 ceolata. Causes small, circular or irregular, grayish, frequently 

 vvhite spots, with reddish or purple margins. Conidiophores fasci- 

 culate, somewhat wavy, sometimes branched, non-septate, hyaline, 

 35-40 X 3-3.5 II, conidia cylindrical, non-septate or 1-2 septate, 15-38 

 X 4 /x. 



