104 NOTICES OF NORTH AMERICAN FUNGI. 



* Helminthosporiumvelutinum. Lli. — On dead twigs oi Laurus 

 Caroliniana. Car. Inf. Ravenel. No. 1798. 



636. Ifelminthospoxiuin xnelanosporum. B. ^ C. — Floccis gra- 

 cilibus articulatis ; spoils breviter fusiformibus multiseptatis ; arti- 

 culis verticaliter divisis. 



On fallen branches. Car. Inf. No. 2306. 



Threads slender, even, simple ; spores dark, subfusiform, or cask- 

 shaped, with many close septa, and a few vertical divisions. No. 

 6257. Boston, Sprague, differs in the threads being rather thicker, 

 and not articulate. 



* Helminthospoxium claTariaxuin . Besm. — On Clavarice. Bos- 

 ton, Sprague. No. 6260. 



Tulasne has shewn in his " Carpologia " that this is a condition 

 of a Sphceria. 



637. Helminthosporium dubium. B.^- C— Molle ; floccis brevi- • 

 bus obtusis basi diraricato-divisis ; sporis oblongis, 7-septatis. 



On the underside of leaves apparently of Viburnum. Alabama, 

 Beaumont. No. 4651. 



Flocci short, divided in a divaricate manner at the base, obtuse ; 

 spores oblong, with about seven septa, -0016 long. There is occa- 

 sionally a single vertical septum. 



638. Helminthospoirium iuflatum. B. cfc .Raz'.— Mycelio ramoso 

 repente, floccis fuscis flexuosis ; sporis arcuatis apiculatis, 4-sep- 

 tatis ; articulo altero inflato colorato. 



On branches of Myrica cerifera. Car. Inf. Ravenel. No. 

 1585. 



Mycelium creeping, branched, colourless, giving rise to erect, 

 flexuous dark threads, the two basal articulations of which are colour- 

 less bearing one or two spicules above, on which are seated the 

 curved, somewhat lanceolate, quadriseptate spores, "0028 long, one 

 joint of which is inflated and dark, the rest colourless. 



639. Helminthosporium subfuscum. B. Sf C. — Molle ; floccis 

 pallidioribus basi divaricato-ramosis ; articulo ultimo in sporam 

 triseptatam sublanceolatam mutato. 



On dead branches. New Jersey. No. 4679. 



Threads rather thick, pale, branched in a divaricate manner at 

 the base, but swollen below the ultimate joint, which is at first 

 obtuse, forming the somewhat lanceolate, very slightly curved, 

 triseptate spore, '002 long. 



640. Helm.inthospoxium tiaxa. B. <f- i?ap.— Floccis tenuibus arti- 

 culatis; sporis sublanceolatis curvulis, 4-septatis. 



On fallen branches. Sulphur springs. Car. Sup. Ravenel. 

 No. 1520. 



Threads slender, unbranched, not the least flexuous ; spores 

 somewhat lanceolate, swollen below, •002--0025 long. - The spores 

 in these three species are of a peculiar type, and closely resemble 

 each other, but the flocci are very different. 



