586 Went . — Notes on Sugar-cane Diseases . 
numbers, but very few conidia are to be found. In order to get 
these it is necessary either to seek in cracks of diseased canes 
or to allow a piece of longitudinally split diseased cane to dry 
slowly. In the latter case, after twenty-four to forty-eight 
hours, some black streaks appear running lengthwise of the cane 
on the cut surfaces. On examining these by the aid of the 
microscope, it is clear that they are stromata ; from each 
stroma spring a great number of dark-brown hairs, and at the 
foot of these the conidia are found (Fig. 4). Figs. 5 and 6 
give a more magnified view of two such hairs, with the 
conidia forming cells at their base. Each hair is divided into 
cells. Very often the case of Fig. 6 occurs, viz. that the top 
of the hair remains uncoloured. Fig. 7 represents three 
stages in the formation of conidia on their basidia ; in c the 
conidium is almost ripe, and has already assumed its charac- 
teristic sickle-shaped form. This may be still better seen in 
Fig. 8, where a ripe conidium is represented ; the conidium is 
colourless and contains a protoplast which is highly re- 
fringent. Fig. 9 shows some other forms of conidia, which 
sometimes may be found ; the difference in form is mostly 
due to the position in which these conidia are seen. I have 
already remarked that in nutrient solutions very few conidia 
are developed ; in that case there are no brown hairs to be 
found, or only here and there a single one. Fig. 10 shows 
a mycelium-filament of such a culture, which has given off 
several short branches ; these will again develop branches, 
which will be the basidia on which the conidia are found. 
The conidia germinate very easily in nutrient solutions ; 
Fig. 1 1 shows three stadia of germinating conidia. By culti- 
vating one single conidium in a hanging-drop, the evidence 
may easily be got that the mycelium emanating from it later 
on, forms the above-mentioned chlamydospores ; the result 
therefore is that these and the conidia belong to the same 
fungus. 
From the above-mentioned characters it will be seen that 
the fungus belongs to the genus Colletotrichum ; I have named 
it Colletotrichum falcatmn because of the shape of the conidia. 
