HELMINTHOSPOEIUM. 407 



fl Conidia 3-o-se2)tate. 



Helminthosporium tilias. Fr. 



Effused, lax or slightly tufted ; conidia cylindric-obclavate, 

 60 X 15 jjL, 5-pseudo-septate, sooty, terminal or fasciculate, 

 filiform, septate; hyphae of equal lengtli. 



Hehninthosjyorium tiliae. Fries, Syst. Myc, iii. p. 360; Sacc, 

 Syll., iv. n. 1950. ^ 



On dead, decorticated branches of Tilia. 



Quite distinct from Exosporium tiliae, although, the two 

 bear a superficial resemblance to each other. 



Helminthosporium Rousselianum. Mont. 



Hyphae sooty-black, gregarious, simple, base bulbous, 

 apex pellucid, oblong, incrassated, nodulose, remotely 

 septate ; conidia fusiform, hyaline, 3-5-septate, 50 X 5 /x, 

 inverted laterally in the hyphae. 



Helmintliosporium Mousselianum, Mont., Cast., vi. n. 84 

 Mont., Syll. Crypt., n. 1129; Sacc, Syll., iv. n. 1957. 



On wood. 



Helm.inthosporium. subulatum. Xees. 



Hyphae subsimple, subulate, loosely aggregated, straight 

 conidia rather large, clavate, incurved, 3-4-septate. 



Helminthosporium suhulatum, Nees, Nov. Act. N. C, ix. 

 p. 242 ; Sacc, Syll., iv. n. 1958. 



On oak branches. 



Helm-inthosporium. nanum. Nees. 



Hyphae simple or furcate, nodulose, opaque, rigid, erect, 

 short; conidia subcylindrical, ends obtuse, 3-5-septate, 

 equal to or twice as thick as the hyphae. 



Helminthosporium nanum, Nees, Syst., p. 67, f. 65 ; Sacc, 

 Syll., iv. n. 1962. 



On rotten wood, stems, &c. 



Helminthosporium. delicatulum. Berk. 

 Tufts soft, thin, black, hyphae subulate, slender, multi- 

 septate, brown, paler above; conidia subhyaline, oblong, 

 ends obtuse, 3-4 septate, curved cells sometimes vertically 

 septate. 



