1899] BRIEFER ARTICLES 429 
throughout their length, while in the latter a great many of the longer 
hairs as well as many of the shorter ones taper almost to a point. 
The description and measurements of structural parts are as 
follows : 
ZONE OF HAIRS (300—500y in diameter). 
Hairs: (a, pi. XXVTJ) long hairs consisting of 18-20 (more or less) cells 
outside the gelatinous sheath, counting from the basal cells; diameter of 
outer cells 5-8u, of inner 5-8; length of middle and outer (apical) cells 
18-40, of basal 13-20n; shape of basal cells elliptical to oval, of outer mostly 
rectangular, of apical usually rounded at tip. 
(6) Short hairs consisting of 1-6 cells outside the basal cells; diameter 
of basal cells 6—8y, of apical 4-6u (rarely wider than the basal); length of 
cells 13-164; shape of basal cells round to elliptical or oval; of the others 
rounded to rectangular (apical often pyriform). ’ 
Sfores-(c), single or in clusters, 10-15 in diameter, 15-264 long, spherical 
when young, pyriform when mature. 
INTERNAL FILAMENTS. 
Basal cells (d) 8-18 in diameter (broader in a few cases), 10-40m in 
length (rarely larger), oblong to ovoid, often very irregular. 
Cells of longitudinal fibers (e) 3-15u in diameter, very variable and often 
indefinite in length, irregularly cylindrical and often tapering. 
Cells of transverse fibers (f) 4-12y in diameter, much extended and 
variable in length, irregularly cylindrical. 
___ GEORGE G. Hepecock and ABEL A. HunTER, University of Nebraska. 
; EXPLANATION OF PLATE XXVI.—The plate represents a longitudinal 
radial section of a branch a short distance from the base, reaching from the 
outer edge of hairs to the middle of the axis. X 450. @, long hair; 4, short 
hair; ¢, spore formed from a single end cell; d, basal cell; ¢, longitudinal 
fiber of central portion ; f transverse fiber of central portion. 
NOTE ON CORN SMUT. 
_ A FEW years ago the per cent. of smut on corn in the vicinity of 
Manhattan was investigated with considerable care." 
cent. of smutted stalks. This year the amount of smut was <— 
SNe field giving go smutted stalks in 840, or 10.7 per cent. Another, 
"A. S, Hircncock and J. B.S. NorTOoN, Bulletin 62, Kansas Experiment Station, 
December 1896, E 
