SEPTOJTEMA — HELMTNTHOSPOEIUM. 405 



The species with short subelliptioal conidia, formerly 

 included in the present gernis will be found under Brachy- 

 sporiiim. 



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 /*, 

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

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

 cell subacute, hyaline. 



Helminthospoi-ium velutinum, Link, Obs., i. p. 8 ; Sacc, Syll., 

 iv. n. 1914. 



On rotten wood. 



Hehninthosporiuin cylindricnm. Corda. 



Effused, velvety, foscous ; hyphae subfasciculate, filiform, 

 long, simple, septate, sooty, paler upwards, 100-130 x 4r-5fi; 

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

 14^15 X 2-5 /I, pale smoke-brown. 



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

 Syll., iv. n. 1917. 



On rotten wood, beech, &c. 



Helminthosporiam simplex. Nees. 



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

 simple or sparingly branched ; conidia pale, shortly fusiform, 

 2-3-septate. 



Helminthosporium simplex, Xees, 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, 8-septate, pellucid and white, 

 19-20 /i long, often curved, apical cells minute. 



