36 
Ceroospora alternantiierje, n. s. On leaves of Alternanthera 
achyrantha. St. Martinsville, La. Langlois, No. 1430. Maculicolous. 
Spots round, 1-2 millimeters in diameter; dirty brown, with a whitish 
center and shaded brown border; hypha3,25-30 by 5/*, continuous, oliva¬ 
ceous, truncate above, arising from a tubercular base about 25// in diam¬ 
eter; conidia obclavate, hyaline 1-3 septate, G5-80 by 3//. 
Cercospora thall®, ti. s. N. A. F., 2426. On living and dead 
leaves of Thalia dealbata. St. Martinsville, La., October, 1889. Hyph'se 
amphigenous, very short, ovate, 6-8 by 5//, olivaceous, mostly protruding 
in fascicles of 6-15 from the stomata of the leaf. Conidia cylindrical, 
olivaceous, 3-8 septate, 50-100 by 6-8 jx. Ends rounded and obtuse. 
The hyphae form dense, slaty-black, narrow, elongated patches 1J-2 
millimeters wide and 3-5 millimeters long between the veinlets of the 
leaf in the same manner as in C. zebrina , Pass. 
Macrosporium carotje, ti. s. On living leaves of Daucus carota , 
to which it is very injurious. St. Martinsville, La., June, 1888. Lang- 
ois, No. 1327. Turning the leaves yellow, then brown black, and kill¬ 
ing them entirely. Sterile liyphsB erect, at first simple, straight, brown, 
and septate, finally somewhat branched above, and 80-100 jx high by 
4-6// thick. Conidia clavate, brown, 5-7 septate, with one or two of 
the upper cells divided longitudinally, 55-70 by 12-14//, on long, slen¬ 
der (LJ-2 jx thick), permanent pedicels 80-110// long. 
Graphium squarrosum, ti. s. On dead stems of Sambucus. St. 
Martinsville, La., July, 1888. Langlois, 1381. Cinereous gray, stripes 
f-1 millimeter high and about 20// thick; erect, straight; composed of 
closely compacted fibers, with their hyaline free ends densely spiculif- 
erous and spreading on all sides nearly at right angles below and ob¬ 
liquely upwards above, 8-12 by 2^-3//, nearly straight or acutely arid 
sharply bent, with their apices dentate and subobtuse. Conidia borne 
on the spiculiferous ends of the spreading fibers, ovate-oblong, hyaline, 
continuous, 5-7 by 2-2^ jx. Some of the conidia are larger (10-11 // long) 
and 2-3 nucleate. It is uncertain whether these belong to the Graphium 
or are accidental. 
Sphaeridium lacteum, ti. s. On decaying herbaceous stems. St. 
Martinsville, La., January, 1888. Milk white, minute (J-J millimeter 
in diameter), contracted- at base so as to appear briefly substipitate. 
Sporophore branched in a dendroid manner above, the branches monili- 
form, constricted, and separating into elliptical hyaline, 5 by 3//, conidia. 
Phyllosticta virens, ti. s. On living leaves of Quercus virens. 
Louisiana, February, 1887. Langlois, No. 1070. Spots amphigenous, 
1 centimeter in diameter, pale grayish-brown, subirregular, definitely 
limited by a slightly darker line. Perithecia partly erumpent, small 
(75-100//.) Sporules oblong-elliptical or subovate elliptical or sub- 
fusoid, hyaline, 4-7 by 1^-2£//. Differs from the other species on oak 
leaves in the character of the spots and size of the sporules. 
