On two species of Heterosporium particularly Heterosporium echinulatum 79 
The conidia were of a cylindrical shape with rounded ends; the 
majority were two-celled; but unicellular, and three-celled spores were 
also numerous. The spores were not constricted at the junction of the 
septa with the spore wall (fig. 10). They mensured: 13 p— 24 p x 6 p— 12 p. 
The dimensions of the most numerous were 8 p x 20 p. 
5. Conidiophores of H, Betae and of H» variabile. 
Reed and Cooley 1 ) state that the conidiophores of H. variabile 
produce prolongations from the first head as is the case with H. from beta 
and H. echinulatum and Cladosporium; but that these prolongations 
arise from just below the heads; and further that the spores are not 
produced in chaines; but singly upon each head. The also assert that in 
old cultures in which the fungus had been growing under saprophytic con¬ 
ditions for some time, the multicellular spiny spores were no louger pro¬ 
duced; but in place of these, small unicellular smoth spores were produ¬ 
ced by a budding process in chains. Similar spores were never observed 
in cultures of H. from Beta however old they might be. 
In material of H variabile obtained from the herbarium of the 
„Station für Pflanzenschutz“ in Hamburg and mounted in lactophenol, the 
conidiophore heads appeared to be similar to those of H. Betae and 
H echinulatum with from 1 to 4 articulation points (fig. 25 a), thus indi¬ 
cating that in these cases 4 spores had been produced upon one head; 
a head with a prolongation bearing articulations was also seen (fig. 25 b). 
The above described mode of development of the conidia-bearing- 
hyphae with the formation of prolongations from each head, and the origin 
of the conidia as a budding process (acropetalous) has also been observed 
for Cladosporium by Janczewski and confirmed by Shatokowitsch. 
It will also he seen to hold true for H. echinulatum. 
B. Heterosporium echinulatum. 
The germination upon all solid media and in water was similiar 
to but not so rapid as that of H. Betae. The end cells of the multicellular spores 
always produced germ hyphae, the first of which corresponded in position 
with those of H. Betae (fig. 26 zz). After 30 hours nearly every cell of the 
spore had produced germ hyphae, in some cases more than one hypha 
was given off from one cell, and in one case as many as four hyphae were 
counted which arose from an end cell (fig. 26 b). After 24 hours the first 
germ hyphae had branched and produced not only hyphae which grew 
into the substratum or upon it, but also a very characteristic aerial my¬ 
celium, which was very regularly wavy and often spirally coiled (see 
photomicro B). The bends of the hyphae of which the waves were formed 
were of equal dimensions, so that a very characteristic appearence was 
given to all the cultures of H. echinulatum. Spores which had germi¬ 
nated at the bottom of a watch glass with a little water in it had also 
produced these curious aerial hyphae. They were in fact, produced upon 
all the culture media tried and rendered the growths of the H. echinu¬ 
latum distinguishable from all others even in the early stages of mycelium 
1) Reed, H. S. and Cooley, J. S., Centralbl. f. Bact., 2. Abt., 32, 40, 
