18 NORTH AMERICAN FLORA [VorumE 3 
1. Sphaerodermatella Helleri (Earle) Seaver, 
Mycologia 1: 182. 1909. 
Melanospora (?) Helleri Harle, Mublenbergia 1: 13. 1901. 
Sphaeroderma Helleri Sacc. Syll. Fung. 17; 781. 1905. 
Stromata erumpent; perithecia superficial, densely cespitose, 3-20 on an indistinct 
basal stroma, large, 0.5-1 mm. in diameter, deeply collapsing, grayish externally from 
irregular, flat, finally deciduous, wart-like projections apparently formed by the cracking 
of the hard outer layer; substance of the perithecial wall of a dark-brown color, soft, com- 
posed of small-celled parenchyma; ostiolum slightly prominent when young, perforation 
obscure when collapsed ; asci oblong, about 100 * 30, soon evanescent, 4-8-spored ; spores 
2-seriate, ellipsoid, simple, at first hyaline, finally opaque and black, surrounded with a 
more or less distinct hyaline coat, about 25-28 K 12-20 », expelled and blackening the matrix 
when mature; paraphyses indistinct. 
On bark of tree. 
TYPE LOCALITY : Santurce, Porto Rico. 
DISTRIBUTION : Known only from the type locality. 
14. NEOCOSMOSPORA E. F. Smith, Bull. U. S. Dep. Agr. Veg. 
Phys. 17: 45. .1899. 
Microconidia (Cephalosporium stage) hyaline, ovoid to narrow-ellipsoid, straight or 
slightly curved, simple, 4-25 K 2-6 u, borne singly on the ends of short branches of a my- 
celium which fills the water-ducts and interior parts of the living stems of the hosts, often 
1-2-septate ; macroconidia (Fusarium stage) lunulate, 3-5-septate, 30-40 X 4-6, borne on 
the surface of dead stems in immense numbers, on numerous small, ovoid or hemispheric 
conidial beds ; conidiophores compact, pink in mass; on the surface of the dead stems of 
the host, globose, thin-walled, smooth, terminal or intercalary bodies are formed, brick-red 
in mass, individuals 10-124 in diameter, extreme limits 7-15“; perithecia as in Nectria,; 
asci numerous, subcylindric, 8-spored; spores l-seriate, brown, globose or short-ellipsoid, 
continuous, with a distinct wrinkled exospore (the latter sometimes wanting in small 
spores); paraphyses present, inconspicuous, broad, loosely jointed, unbranched, consisting 
of 5 cells. 
Type species, Fusarium vasinfectum Atk. 
1. Neocosmospora vasinfecta (Atk.) E. F. Smith, Bull. U. S. Dep. 
Agr. Veg. Phys. 17: 45. 1899. 
Fusarium vasinfectum Atk. Bull. Ala. Exp. Sta. 41: 28. 1893. 
Fusarium niveum HE. F. Smith, Proc. Am. Assoc. Adv. Sci. 43: 289. 1895. 
Perithecia gregarious, often closely crowded, bright-red, smooth, with a very prominent, 
obtuse ostiolum, becoming perforate; perithecial wall composed of large cells, 12-15 in 
diameter; perithecia 200-225 X 250-2754; asci nearly cylindric, 85-90>12-154; spores 
j-seriate or often irregularly crowded, globose or subglobose, at first hyaline and sur- 
rounded with a transparent exospore, becoming brown, with several large oil-drops 
within, the outer surface becoming wrinkled and rough at maturity; mostly 104 in 
diameter ; paraphyses present, inconspicuous, simple, septate. 
Parasitic on cotton, okra, cowpea, and watermelon. 
TYPE LOCALITY : Alabama. 
DISTRIBUTION : Virginia to Alabama, California, ene DEEeon: 
Exsiccatr: Ellis & Ev. Fungi Columb. 1434. 
ILLUSTRATIONS: Bull. U. S. Dep. Agr. Veg. Phys. 17: pi. "4-10. 
15. CREONECTRIA Seaver, Mycologia 1: 183. 1909. 
Nectria Fries, Summa Veg. Scand. 387, in part. 1849. 
Stromata fleshy or subfleshy, tubercular or depressed, red, yellow, brown, or occasion- 
ally black (at least with age); perithecia globose or subglobose, with the ostiolum often 
depressed with age, smooth, verrucose or furfuraceous, superficial on or surrounding the 
