Apf. 3 $.is »3 Species of Fusarinm Isolated from Potato Tubers 
345 
classified them in various ways, but they all recognized the imperfections 
of the classification. In their monograph Appel and Wollenweber (^) 
have established the boundaries of the genus Fusarium, using Atractium 
Link, Fusidium Link, Fusisporium Link, Selenosporium Corda, Fusoma 
Corda, and Pionnotes Fries, either in toto or in part, as s3nionyms. 
The synonomy of the genus Fusarium given by Appel and Wollen- 
weber (2) is quoted below, and a translation is given of their description 
and notes. 
Synonomy: 
Atractium Link pr. p. in Mag. Ges. Nat. Fretmdc III, S. 10 (1809). 
Fusidium Link pr. p. in Mag. Ges. Nat. Freunde VII, S. 31 (1816). 
Fusidium Link pr. p. in Spec. Plant ii. S. 96 (1825). 
Fusisporium Link tn Spec. Plant i, S. 30 (1824). 
Corda Icon. I. S. 7 (1837^ 
Fusoma Corda Icon. I. S. 7 (1837). 
Pionnotes Fries Sum. Veg. &and., S. 481 (1849) Sacc. Syll. IV, S. 725. 
Conidia more or less polar, mostly dorsiventral, seldom distinctly round (radiar), 
mm^e or less curved; when ripe usumly septated; more or less ^lored when m maM<^ 
borne one after another in the same spot, but not connected in chains on the end^ 
simple or branched septate coaidiophores^ which appear spread out between ^e 
hyphae or joined as they are in coremia, or grouped together in sporodochia. 
Conidia spread out in a powdery form between the hyphae or tubercular-like on a 
limited gelatinous sporodochia, a slimy layer or occasionally as pionnotes without 
definite boundaries. . . u a 
Chlamydosphores, oval or pear ^aped, single or in bunches, in chains or bunded 
up, remaining ^ined for some time, terminal or interc^ary, not more than jme bmne 
in the same place. The chlamydophore is not very different from the conidiophore, 
and it has no distinctive color. It never gathers in gelatinous layers. , , 
Hyphae septate, variously branched epi- and endo-phytic, occurring Sparingly or 
in great quantity, either isolated or together, curly or thick, partly 
especially like a stroma to plectychymatic form with definite shape or without definite? 
shape, more often similar to-an even growth all over, limited or spread out, 9*^*^ 
closed up together on the inside, occasionally building up brightly colored myceliuim 
Note that it is undecided whether species that do not have septate comdia ^ould 
be kept separate from the genus or be placed in a subgenus Fusamen accordii^ to 
Saccardo (17); but there is no question about those which have a t^dency towma 
septation as F, orthoceras. It is also undecided in what ord^ of toportance the 
characters should be taken. The choice is between septations, dorsiyentoamy, 
polarity and the curve of the long axis of the conidia. It is very questionable whether 
Fusarium should be placed under Leptosporium as in Saccardo, and nothing but me 
study of the different forms can decioe the boundaries of the genus. Concerning me 
color of the conidia masses it can be said that black does not appear normally, neimer 
does black mycelium. Light orange and ochre colors predominate in the comdia. 
The mycelium also has yellow, red and blue. The term sclerotium as used in Fma- 
rium is disputable. Researches have not ^own that the term sclerotia Was 3ustifia- 
ble for the plectychymatic structures found. 
In 1913 Wollenweber {22) excluded from the genus all species having 
septocylindrical conidia. In bringing this genus to date, therefore, this 
fact should be incorporated. Sherbakoff {18) describes the genus con¬ 
cisely as follows: 
Hyphomycetes, with from hyaline to bright, but never plain gray nor black, conidia 
and mycelium; conidia sickle-shaped, septate (usually 3 or more septate), apically 
pointed, mostly pedicillate, not appenaiculate, noncatenulate; conidia scatteroa 
over substratum, in pseudopionnotes or in sporodochia, the latter without or ^m 
from flat to wart-like plectenchymic substratum, and always witlmut any differ¬ 
entiated enclosing or surrounding structures; conidiophores from simple to irregu- 
laiiy verticillate. 
30618—23-6 
