HELmXTHOSPOElUM. 407 



f I Gonidia 3-S-septate. 



Helnunthosporiuin tilias. Fr. 



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

 60 X 15 /A, o-pseudo-septate, sooty, terminal or fasciculate, 

 filiform, septate; hyphae of equal length. 



Helminthosporium tiliae, Fries, Syst. Myc, ui. p. 360 ; Sacc, 

 Syll., iv. n. 1950. 



On dead, decorticated tranches of Tilia. 



Quite distinct from Exosporium tiliae, although the two 

 hear a superficial resemblance to each other. 



Helminthosporiuiu Rousselianum. Mont. 



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

 apex pellucid, oblong, incrassated, nodulose, remotely 

 septate ; conidia fusiform, hj-aline, 3-5-septate, 50 X 5 fi, 

 inverted laterally in the hyphae. 



Helminthosporium Sousselianum, Mont., Cast., vi. n. 8-1 

 Mont., SyU. Ciypt., n. 1129 ; Sacc, SyU., iv. n. 1957. 



On wood. 



Helminthosporiuin subulatum. Xees. 



Hyphae subsimple, subulate, loosely aggregated, straight 

 conidia rather large, clavate, incurved, 3— i-septate. 



Hehninihosporiiim subulatum, Xees, Xov. Act. N. C, ix. 

 p. 242 ; Sacc, Syll., iv. n. 1968. 



On oak branches. 



Helminthosporiuia nanum. Xees. 



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. is^VO 



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

 SyU., 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. 



