NOTICES OF NORTH AMERICAN FUNGI. 103 



articulated, zigzag, nodose, sometimes divided sliglitlj above ; 

 spores clavate, with about six septa. 



630. Helminthosporium arbuscula. B. 4- f. — Floccis fasciculatis 

 inarticulatis sursuin processibus brevibus deorsum incrassatis apice 

 sporiferis pra?dilis ; sporis subfusiformibus 3-septatis. 



On bark of various trees. On Acer. Car. Sup. No. 54. On 

 Rhus copaUina. Car. Inf. No. 1445, with Podosporium rigidiim. 

 On Carya. No. 3234. On Magnolia glauca. Eavenel. No. 

 1671. On Aeerrubrum. No. 1609. 



631. Helminthosporium xectnm. i?. ^' C. — Floccis brevibus sim- 

 plicibus triseptatis ; sporis oblougis utrinque obtusis triseptatis. 



On oali wood. Car. Inf. No. 2275. 



Flocci short, simple, with but very few articulations, partially 

 clothed with gelatinous shreds ; spores oblong, obtuse at either 

 end, triseptate. 



632. Helminthosporium obtusissimum. B. <|' C. — Floccis tenui- 

 oribus septatis ; sporis biseptatis utrinque obtusissimis. 



Ou dead wood. Car. Inf. No. 3050. 



Flocci longer and more slender than in tlie last, with more arti- 

 culations; spores oblong, very obtuse at either end, with two or, 

 more rarely, three septa. Resembling in some respect H. oosporum, 

 Cd., but the habit is very different. 



633. Helminthosporium moUe. B. th C. — Molle ; floccis fascicu- 

 latis flexuosis obtusis simplicibus ; sporis oblongis vel oblongo- 

 ellipticis utrinque obtusis triseptatis. Journ. Linn. Soc. x., p. 361. 



On Passiflora. Car. Inf. No. 2108. On Doliclios (cow pea). 

 No. 1575, on which also it occurs in Cuba. 



Forming a soft velvety stratum ; flocci fasciculate, flexuous, 

 simple, obtuse ; spores oblong or oblongo-elliptic, obtuse at either 

 end, triseptate. 



634. Helminthosporium interseminatum. B. Sf iJat'.— Effusum 

 molle ; floccis gracilibus ramosis hie illic sporiferis geniculatis ; 

 sporis oblongis bi-triseptatis. 



On Phytolacca decandra. Car. Inf. Ravenel. No. 1192. On 

 Cicuta maculata. I'ennsylvania, Michener. 



Forming a soft effused stratum ; threads slender, branched 

 above, geniculate, bearing here and there, the oblong 2-3 septate 

 spores '00086 long. 



635. Helminthosporium Pruni. B. d; C. — Floccis gracilibus sep- 

 tatis articulis supra inflatis ; sporis apicalibus subclavatis 4-septatis 



On bark of Prunns serotina. Car. Sup. No. 775. 



Threads slender, septate, articulated, one or two joints at the 

 top swollen ; spores seated at the tips of the threads, subclavate, 

 slightly torulose, quadriseptate, often more or less distorted. 



* Helminthosporium apiculatum. Cd. — On Coi'nus florida. Car. 

 Inf. No. 2452, 3237. On oak. No. 1158. 



Spores rather apiculate. 



