SEPTONEMA HELMINTHOSPORIUM. 405 



The species with short subelliptical conidia, formerly 

 included in the present genus will be found under Brachy- 

 sporium. 



Distinguished from Cladosporium by the conidia being more 

 than 1-septate at maturity. 



f Conidia 2-3-septate. 



Helminthosporium velutina. Link. 



Effused, black, velvety ; hyphae filiform, 200-250 X 6-7 p., 

 septate, smoky-black ; conidia from oblong to ovate-obpyri- 

 form, 25-30 x 11-13 /*, 3-septate, smoky, 3-guttulate, lowest 

 cell subacute, hyaline. 



Helminthosporium velutinum, Link, Obs., i. p. 8 ; Sacc., Syll., 

 iv. n. 1914. 



On rotten wood. 



Helminthosporium cylindricum. Corda. 



Effused, velvety, fuscous ; hyphae subfasciculate, filiform, 

 long, simple, septate, sooty, paler upwards, 100-130 x 4-5 \L ; 

 conidia cylindrical, apex rounded, base acute, 3-5-septate, 

 14-15 X 2-5 fj., pale smoke-brown. 



Helminthosporium cylindricum, Corda, in Sturm, t. ii. ; Sacc., 

 Syll., iv. n. 1917. 



On rotten wood, beech, &c. 



Helminthosporium simplex. Nees. 



Thin, effused, black, toruloid, hyphae densely crowded, 

 simple or sparingly branched ; conidia pale, shortly fusiform, 

 2-3-septate. 



Helminthosporium simplex, Nees, Nova. Act. Leop., ix. p. 241, 

 t. v. f. 11 ; Sacc., Syll., iv. n. 1921. 



On willow wood. 



Helminthosporium capitulatum. Corda. 

 Tufts minute, somewhat effused, glaucous brown ; hyphae 

 quite simple, erect, septate, clear brown, pellucid, apex 

 white, and crowned with an incomplete, whitish head of 

 conidia which are oblong, 3-septate, pellucid and white, 

 19-20 p. long, often curved, apical cells minute. 



