[Vor. 8 
10 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
From the cultural experiments with a large number of different 
media I observed certain marked differences in morphological 
characteristics of the hyphae and sclerotia exhibited by the 6 
strains, most of which are constant, showing no variation for 
any strain on the same medium and often none on different 
media. The most striking features shown by the strains will be 
summarized in the following table: 
TABLE I 
SHOWING THE MORPHOLOGICAL CHARACTERISTICS OF THE HYPHAE AND 
SCLEROTIA OF THE 6 STRAINS 
Diameter of Size of sclerotial cells Color of sclerotia 
hyphae (u) Extreme and average (on corn meal)* 
measurements (y) 
P1 8-12 11-17 X 20-56 Brick-red in young, cinna- 
Average 12 x 40 mon-brown or chestnut- 
brown in old 
P4 8-13 17-23 X 26-48 Chocolate in young, warm 
Average 18 X 32 blackish brown in old 
P7 3-6 8-13 X 15-28 Clay-color to tawny olive 
Average 9 X 21 
B1 8-14 12-34 X 29-54 Mars brown or chocolate 
Average 27 X 40 
H 7-11 8-20 X 19-48 Hazel or brick-red_ in 
Average 14 X 38 young, cinnamon-brown 
in old 
B3 8-12 14-26 x 16-42. Mars brown or darkish 
Average 25 X 36 brown 
* Color designations are in accordance with Ridgway's “Color Standards and 
Nomenclature." 
As shown in the table, the sclerotia of B1 are strikingly large 
and roundish, while those of P7 are the smallest of all and very 
light in color. There is also a remarkable difference in diameter 
of hyphae between P7 and the other strains. In general, there 
is no striking difference between P1 and P4 and H, though there 
exist minor differences in color, size, and shape of sclerotia. 
