102 NOTICES OF NORTH AMERICAN FDNGI. 



"Var. Caudatum, sporis basi valde attennatis. On Castanea 

 pwnila. No. 4038. On oak. Car. Inf. Ravenel. No. 1237. 



Spores '0035 long, very much attenuated below, but the species 

 is scarcely distinct. 



625. Helminthospoxium olivaceum. B.^Il. — Olivaceum ; floccis 

 brevibus e mycelio repente oriundis flexuosis quandoque nodalosis ; 

 sporis longissiuiis lineari clavatis, 10-12 septatis. 



On leaves of Gleditschia. Car. Inf. Ravenel. No. 1333. 



Forming thin olive patches ; mycelium consisting of creeping 

 jointed threads, from which the short, erect, flexuous, sometimes 

 nodulose fertile threads arise, which bear at their tips one or two 

 very long, linear, clavate spores, with about twelve septa. 



026. Helminthosporium Petexsii. B. tfc C. — Floccis e maculis 

 orbicularibus fuscis oriundis nodulosis demum atris obscuris ; sporis 

 clavatis 6-septatis. 



On orbicular brown spots on the underside of leaves of Smilax. 

 Car. Inf. No. 4942. On Laurus Benzoin. Alabama, Peters. 

 No. 3875. 



Flocci nodulose, at first pale, then so dark as to mask auy septa, 

 which, however, appear to be always absent ; spores lateral, or 

 more rarely apical, clavate, with about six septa, -004 long. 



* Helminthospoxium foliculatum. Cd. — On Zea. Pennsyl- 

 vania, Michener. No. 4367. On cabbage stalks. New England. 

 Murray. No. 5423. On Quercus laurifolia (living bark). Car. 

 Inf. No. 1016 ; var. with the spores concatenate with an inter- 

 vening globose cell. » 



627. Helminthosporium fragilissimum. B. i]' C, — Valde fragile; 

 sporis clavatis cum floccis continuis. 



On dead twigs of Smilax. Car. Inf. No. 2386. On S. rotun- 

 difolia. No. 3765. 



Extremely brittle ; spores clavate, so continuous "with the septate 

 flocci that there is no distinction. 



6-28. Helminthosporium Ravenelii. Curtis. — Spongiosum; floccis 

 nodosis ramosis inarticulatis ; sporis cymba^formibus 4 — articulatis. 

 y/. Hoffmanni. B. Mss. 



Forming a thick spongy mass on the inflorescence of Sporobolns 

 Indicus. Car. Inf. No. 1339. The fungus is so common on the 

 inflorescence of this grass that specimens are rarely found without 

 it, and its common name of Black-seed Grass is derived from it. 

 Flocci branched, nodulose, apparently inarticulate; spores boat- 

 shaped, with about four septa, the endochromes connected with 

 each other by a little process as in some SiohcBricB. The species 

 occurs also in Cuba, 



629. Helminthosporium nodosum. B. Sf C. — Sparsum ; floccis 

 articulatis ad articulos nodosis ; sporis clavatis 6-septatis. 



On inflorescence of Eleusine Indica. Car. Inf. No. 1331. 



Not forming a spongy mass as in the last, but scattered ; flocci 



