340 
Journal of Agricultural Research 
Vol. XXIV, No. 4 
studies. To this organism the authors applied ..the name Fusarium 
oxysporum Schlechtendal because they felt it “not at all certain” that 
the various names given to species of Fusarium growing on potatoes 
really stood for distinct forms. They therefore considered them as 
synonyms and used the earliest available name. This paper was the 
pioneer for Fusarium work in this country, and in addition to the careful 
work done, mycologists and pathologists are greatly indebted to its 
authors for the impetus given to the study of potato Fusaria, both in 
this country and abroad. 
In 1910 Appel and Wollenweber {2) published a basis for a monograph 
of the genus Fusarium Link. This paper was the first to give a compara¬ 
tively exhaustive treatment of the species of Fusarium. It is divided 
into two parts. In the first part the following subjects are discussed in 
detail: Methods, including media, inocula, nutrients, light, tempera¬ 
ture, color standards, variation in forms appearing in the cultures, 
mycelium, etc., lack of distinction between microconidia, and macroco- 
nidia and characters which constitute a “normal” culture or “normal” 
spore. These authors give a description of the genus Fusarium, discuss 
its relationships, and list its S)monomy. 
The second part relates entirely to taxonomy. Thirteen known species 
are described with the greatest care and detail, each description being the 
record of a research problem in itself. This paper is, without doubt, the 
most fundamental in the literature on Fusarium. It is not here reviewed 
in proportion to its worth, because our experimental work was not di¬ 
rectly influenced by it. The paper was published in Germany 10 years 
ago and did not include many of the common American species. There¬ 
fore, it was not well fitted for our identification work. The paper con¬ 
tains a very good bibliography of the Fusarium problem. 
In 1912 Jamieson and Wollenweber (9) described the symptoms of a 
disease causing dryrot of potato tubers, first noted on tubers sent from 
Spokane, Wash., in February, 1910. To the causal organism of this dis¬ 
ease Wollenweber gave the name Fusarium trichotheciodes^ placing it in 
the Discolor group. Inoculation experiments proved the pathogenicity 
of this organism in producing the characteristic dryrot of tubers. 
In 1912 Wilcox, Link, and Pool {20) published a research bulletin 
in which they described a rot which is practically identical with that 
described by Jamieson and Wollenweber (9), but due to the fact that 
the two papers were published so close together and that the investiga- 
tiona^work was being carried on simultaneously and independently, these 
authors gave to the casual organism the name Fusarium tuberivorum 
Wile, and Link, which we know now to be a synonym of F. trichothecioides 
Wollenw. Wilcox, Link, and Pool’s paper is of particular value to our 
work because of its emphasis on taxonomy. 
This paper gives the history and distribution of the dr)rrot of tubers 
and the economic importance and symptoms of the particular dryrot 
under discussion. The authors give a resume of the genus Fusarium 
and allied genera from 1809 to date, concluding with Appel and Wol- 
lenweber’s description of it. 
Details are given concerning the technic for studying the fungus, 
such as temperature, light, single-spore isolation, and color standard; 
and a discussion is made of macroscopic characters, mycelium, influence 
of temperature, influence ©f humidity, color characteristics, conidiophores, 
chlamydospores, spore measurements, and spore septations. Consider¬ 
able space is given to the last-mentioned topic. The importance of 
