2 E. J. BUTLER. 
Besides these two spore-forms found attached to the hyphe 
within the plant tissues, two others were found on the surface of the 
bark over blackened areas which occur on diseased plants at the 
base of the stem. One of these was a Nectria, characterised by 
bright red perithecia within which were numerous cylindrical asci, 
each with eight colourless, bicellular spores. The other, which was 
always present in great quantity on the bark, was a Fusarium, 
a genus the members of which are in several cases known to be 
merely the lower stages of species of Nectria and allied fungi. 
Pure cultures made from the Nectria ascospores gave rise in 
turn to Cephalosporium, Fusarium and chlamydospores indistin- 
guishable from those found as described above on the diseased plant. 
The Nectria form itself was not again obtained in these cultures, 
though some of them were maintained for more than two years on a 
large variety of media. It was, however, once obtaimed in culture 
from the similar fungus found on black pepper. 
Infection experiments with pure cultures of the fungus were 
carried out. As mentioned on page 28 of the previous paper, the 
results were irregular, the inoculated plants taking the disease 
in some of the experiments and not in others. 
As the details of these were not given, the results of a few may 
be summarised here. 
Experiments with Nectria and Cephalosporium from 
wilted Pigeon-pea. 
A preliminary experiment showed that infective material 
occurred on the surface of diseased roots and of the base of the stem, 
a washing from these parts after they had lain for two days in a 
moist chamber, proving fatal to healthy plants. 
Series I. 
The culture used was a nutrient gelatine subculture from a 
plating from the surface of the bark of a wilted plant, overlying 
a blackened area in the wood where the tissues were full of hyphe, 
