286 
which have not yet been given, between the Fusarium under 
study and that. described as Fusarium udum by Butler on 
pigeon-pea in India.* The question of the identity of the 
Fusarium with one of the species separated out and described in 
recent years in America or with F. diantht, Pril. and Del.,+ the 
cause of.a carnation disease in France, was attended with many 
difficulties but was not overlooked. With regard to the former, 
the Fusarium seemed to be nearest to Fusarium radicicola, 
Wollenw., the cause of a tuber-rot of potatoes,t and to differ 
from the latter in having a Cephalosporium stage in place of the 
Cylindrophora of Delacroix as well as in other details. Dela- 
croix’s suggestion that F. dianthi was carried by nematodes is of 
interest in view of what is recorded under a previous heading. 
There did not seem, however, to be any sufficient reason for 
going further afield than F. udum, a species which was set up 
to obviate such a position as that in which the writer found him- 
self when confronted with the task of naming the Fusarium. 
Efforts had already been made to induce the formation of the 
perfect stage of the Fusarium, both as it occurred previously on 
carnations and other plants and latterly on cashew-nut seedlings, 
by damping the cultures and growing the fungus on steamed 
cashew-nut twigs and seeds, of which several were kept out-of- 
doors under natural conditions, but they had met with no success. 
The only perithecial formation found at any time was the 
Nectria on rotted cashew-nut seeds, and it was shown to have a 
Fusarium differing entirely from F. udum. Moreover, other 
forms, species of Botryosphaeria, Dothiorella and Phomopsis, have 
been found on wilted Grevillea seedlings left standing on the soil 
after death, but no evidence that any connection exists between 
either of them and the Fusarium has been derived from the 
culture work carried out. 
The identification of the Fusarium being called for on grounds 
of convenience alone, it was therefore necessary to rely on 
cultural and morphological characters, and it was thought 
advisable to repeat some at least of Butler’s cultural experiments; 
and also to attempt the inoculation of pigeon-pea, its host in 
India, to show whether or not the Uganda Fusarium was identical 
with Fusarium udum. Liquid and solid media prepared, as 
under, according to Butler’s directions were inoculated wit 
spores of the cashew nut strain from the agar cultures which 
had provided inoculum for the infection experiments. The 
standard solution for the liquid media consisted of ammonium 
nitrate 5 gr., potassium phosphate 2-5 gr., and magnesium 
sulphate 1-25 gr. in 500 cc. distilled water, and the substances 
mentioned below were added to flasks containing each 30 cc. of 
a mame solution. Notes on the cultures are appended to 
each. 
* Memoirs of the Dept. of Agric. in India: Bot. Series 2- 
No. 9, 1910. 
+ G. Delacroix, Annales de l'Institut National Agronomique, 16, 1901. .- 
t Jour. Agric, Res. 2, 4, 257, 15 July 1914. an 
