TRIPOSPOBIUM HELICOSPORIUM. 439 



Sect. VI. HELICOSPOKAE. Sacc. 

 HELICOSPOKIUM. Nees. (figs. 10, p. 397, and 29, p. 443.) 



Sterile hyphae creeping, fertile ascending, dark-coloured, 

 furnished here and there with small spine-like ongrowths 

 that bear the conidia. Conidia terminal or lateral, spirally 

 coiled, hyaline or coloured, pluriguttulate or pluriseptate, 

 coloured. 



Helicosporium, Nees, Syst. der Pilze, p. 68 ; Emend., Sacc., 

 Mich., ii. p. 29 ; Sacc., Syll., iv., p. 557. 



Some pale coloured species connect the present genus with 

 Helicomyces in the Mucedineae. 



Helicosporium pulvinatum. Fr. 



Tufts broadly effused, dingy yellowish-white, becoming 

 dusky ; hyphae slender, septate, branched, dingy olive, 3-4 p, 

 diameter ; conidia in spirals with 23 turns, 2 p. diameter, 

 70-80 p. long, not septate but multinucleate, hyaline. 



Helicosporium pulvinatum, Fr., Syst. Myc., iii. p. 354; Sacc., 

 Syll., iv. n. 2638. 



On rotten wood, especially oak. 



Far. effusum, Berk. Tufts effused, exceedingly thin; 

 conidia colourless. 



Helicosporum Mulleri. Sacc. (fig 10, p. 397.) 



Tufts broadly effused, rather woolly, dark olive; sterile 

 hyphae creeping, fertile ascending, fasciculate, 10 p. thick, 

 not branched, septate, smoky or brownish, towards the tip 

 with minute branchlets or tooth-like projections that give 

 origin to the conidia. Conidia cylindrical, sparingly septate, 

 6-7 p. thick, colourless, spirally coiled, diameter of entire coil 

 about 25 p.. 



Helicosporium Mulleri, Sacc. Mich., ii. p. 129 ; Sacc., Syll., 

 iv, n. 2639. 



Helicoma Mulleri, Corda. 



On rotten wood of poplar, oak, &c. 



Helicosporium viride. Sacc. 



Tufts effused, olive-green ; mycelium olive, interwoven, 

 fertile threads erect, septate, olive, tips paler ; conidia large, 



