836 
Journal of Agricultural Research 
Vol. XXX, No. 9 
For a proper understanding of the 
terms ( 8 ) used for normal forms of re¬ 
productive stages and mycelium of 
Fusaria the characters considered of 
primary importance are enumerated 
below. 
I. Normal reproductive stages 
1. Microconidia: 0-(0-3)-septate, 
globose-pearshaped as in F. 
poae (Peck) Wr. (fig. 1A); el¬ 
lipsoidal as in F. orthoceras 
App. et Wr. (fig. 1, B); ovoid- 
fusoid as in F. moniliforme 
Sheld. (fig. 1, C); comma- 
shaped as in F. chenopodinum 
(Thum.) Sacc. (fig. 1, D). 
They may be found scattered 
(fig. 1, A-D), in false heads 
(fig. 1, E), or in chains (fig. 1, 
F) and may form sporodochia 
and pionnotes. 
2. Macroconidia: O-pluriseptate, 
dorsiventral, fusoid to sickle¬ 
shaped, apedicellate and pedi¬ 
cellate, scattered, sporodoch- 
ial and pionnotal. 
a. Septation types: 
0-septate, F. flavurn 
(Fr.) Wr. (fig. 1,0); 
1-septate, F. dimerum 
Penz. (fig. 1, P); 
3-septate, apedicellate, 
F. betae (Desm.) Sacc. 
(fig. 1, K); 
3-septate, pedicellate, F. 
poae (Peck) Wr. and 
(fig. i, J); 
5-septate, F. chenopodi¬ 
num (Thum.) Sacc. 
and (fig. 1, M); 
5-7-septate, F. cheno- 
odinum (Thum.) 
acc. and (fig. 1, N); 
9-septate, F. decemcel- 
lulare Brick. 
b. Sporulation types: Scat¬ 
tered; in false heads; 
pionnotes, continuous, 
gelatinous, slimy, (1) 
formed on the naked 
surface of the substratum 
(fig. 1, Li) as in section 
Eupionnotes, species of 
section Roseum, Gibbo- 
sum, Elegans and Dis¬ 
color, or (2) on a mycelial 
sheet as in F. avenaceum 
(Fr.) Sacc. (fig. 1, Mi) or 
(3) composed of an aggre¬ 
gation of sporodochia as 
in F. martii App. et Wr. 
(fig. 1, Ni); sporodochia, 
(1) tubercularialike (fig. 
1, Hi) found in the ma¬ 
jority of species of all sec¬ 
tions except Ventricosum 
and some species of Ele¬ 
gans and Eupionnotes 
(. 2 ) in columns represent¬ 
ing a chainlike develop¬ 
ment, as in F. stilboides 
Wr. (fig. 1, Ki). 
c. Shape: Fusoid-lanceolate, 
slightly curved, mostly 
apedicellate, F. argilla- 
ceum (Fr.) Sacc. (fig. 1, 
I); slightly sickle-shaped, 
apedicellate, F. betae 
(Desm.) Sacc. (fig. 1, K); 
sickle-shaped, pedicellate, 
most of the species; 
strongly dorsiventral, F. 
scirpi Lamb, et Fautr. 
and F. chenopodinum 
(Thum.) Sacc. (fig. 1, N); 
terminal cell suddenly 
constricted, F. culmorum 
(W. G. Sm.) Sacc. and 
F. chenopodinum (Thiim.) 
Sacc. (fig. 1, M); terminal 
cell whiplike, much elon¬ 
gated F. scirpi Lamb, et 
Fautr. and F. chenopo¬ 
dinum (Thiim.) Sacc. (fig. 
1, N); curvature within 
the limits of conical sec¬ 
tions as elliptic (fig. 1, 
M), parabolic and hyper¬ 
bolic (fig. 1, N). The 
curvature is mainly de¬ 
termined from the dorsal 
and ventral sides of 
spores, in side view, with¬ 
in the septation regior. 
3. Chlamydospores: Terminal (fig. 1, 
Bi, Di) , intercalary (fig. 1, Ai), 
single, in chains, in clusters, 
mycelial (fig. 1, Z to Bi), coni- 
dial (fig. 1, Ci). 
a. Terminal: In sections Ele¬ 
gans, Martiella, Ventri¬ 
cosum; unicellular, F. ar- 
gillaceum (Fr.) Sacc. (fig. 
1,N Di); 0-1-septate, sec¬ 
tions Martiella and Ele¬ 
gans (fig. 1, Bi). Most 
fungi forming terminal 
spores may also develop 
intercalary spores. In 
section Ventricosum no 
intercalary spores are 
produced. 
b. Intercalary: Mostly 0-1-sep¬ 
tate (fig. 1, Ai) in sections 
Elegans, Martiella, Dis¬ 
color, Gibbosum, and 
Eupionnotes (subsection 
Chlamydospora). Chains 
and clusters (fig. 1, Z) 
may also occur in most 
of these sections. 
