150 REPORT OF THE DEPARTMENT OF BOTANY OF THE 
Teil des Halmes ein.’ No clue to the identity of the fungi is given. 
The above discussion of silver top is brought into this article 
on carnation bud-rot not because our investigation throws any new 
light on the cause of silver top, but for the reason that the Sporo- 
trichum and the mite found in connection with it prove to be iden- 
tical with the Sporotrichum and mite of carnation bud-rot. 
RELATIONSHIP OF SPOROTRICHUM PO, S. ANTHO- 
PHILUM AND:sHEALD SWUSARIOMs: 
As the investigation advanced it gradually became evident that 
Sporotrichum poe Pk., Sporotrichum anthophilum Pk. and Heald’s 
bud-rot Fusarium are one and the same species. In the first place, 
a comparison of Peck’s descriptions of his two species of Sporo- 
trichum shows them to be strikingly alike except as to the host 
plant. Sporotrichum poe is described as follows: “* Hyphe slender, 
.oooo8—.o00012 of an inch thick, procumbent, branched, slightly 
interwoven, white; spores colorless, subglobose, .o0016—.00032 
of an inch [4 to 8 »] broad. Sheaths and culms of Kentucky blue 
crass, Poa pratensis.” 
Sporotrichum anthophilum is described as follows: “ Hyphee 
creeping, interwoven, branched, continuous or sparingly septate, 
variable in thickness, .oooo8—.00024 of an inch in diameter, hyaline, 
forming a loose cottony stratum; spores globose or broadly ovate, 
.00OO16—.0003 of an inch long, borne at the tips of short branch- 
lets which are usually narrowed toward the apex and pointed. Para- 
sitic on the filaments and petals of carnation pinks destroying their 
vitality and spoiling the flowers.” 
It will be observed that neither description contains any reference 
to septate spores although spores distinctly once-septate like those 
shown in Plate XIII, fig. 3, occur almost constantly both in the car- 
nation fungus and in the June grass fungus. Without having made 
any attempt at an accurate determination it is estimated roughly 
that, in carnation buds, the usual proportion is about one septate 
spore to 100 or 200 non-septate spores. Occasionally, they may be as 
frequent as one to twenty-five and occasionally so rare that a long 
search is required to find one. As a rule they are easily recognized, 
being somewhat larger than the ordinary spores and more or less 
pear-shaped, whereas the ordinary spores are well described as 
“ globose or broadly ovate.” That these large, pear-shaped, two- 
“By PYG Stewart. 
