THE WILT DISEASE OF PIGEON-PEA. 53 
more or less regularly in the media on which the fungus grows satis- 
factorily. Of these the most striking is the moist, bacterial-like 
surface growth which developed sooner or later in all the cultures 
in which growth was considerable, except rice and plantain. It is 
most strongly developed in ordinary agar streak cultures, which 
would be taken on a cursory examination for bacterial growths. 
It is quite unlike the growth of the conidial stages of either Neocos- 
mospora vasintecta or of the Nectria mentioned in the early part of 
this paper. The second character of importance is the colour. In 
almost all the successful cultures this developed first with spore- 
formation and was largely confined to the spores. It ranged from 
pale flesh colour to salmon pink in these cases, and examination of 
spores in the mass never indicated a deeper tone than the latter, 
On rice, however, the substratum and the mycelial layers in contact 
with it developed a much deeper orange-red (plate III, fig. 3). This 
was altogether independent of spore-formation, and examination 
showed that the colour was contained in the hyphal contents not 
in the walls. In no cases were any green, blue, purple or carmine 
tones developed and this fact serves at once to distinguish the spe- 
cies from Neocosmospora (cf. plate IIT, figs. 4 and 5). 
Of less important characters, because less constant, the chief is 
the formation of Tubercularious stromata observed in cultures on 
acid potato and on plantain. The formation of coremial strands 
on rice, plantain and onion is a character of the same nature, but is 
not constant even on these media, as the onion cultures showed. 
Of other cultural characters it may be said that the fungus 
grows equally well when carbohydrate is supplied as sugar (in the 
liquid cultures) or as starch (in the solid cultures). In the former 
case glucose is the most suitable, saccharose next and maltose least 
of the three tried. Similarly of starchy media potato, carrot, rice 
and plantain were the best in the order named, while tapioca was 
hardly capable of utilization at all. As regards reaction, acid 
potato, carrot and rice gave better results than normal, and in potato 
and rice the normal was better than the alkaline culture. In 
