65 
rella perithecia, and vice-versa, is that the former is the conidial 
stage of the latter.* It might be mentioned here that the few 
attempts made te infect Coffea robusta and Coffea excelsa with 
conidia from cacao Colletotrichum have been unsuccessful. 
B.—CoLLeTOTRICHUM ON TEA, CoTTON, AND OTHER PLANTS. 
| Colletotrichum on Tea.—Colletotrichum camelliae, Mass., the 
fungus causing Brown Blight of tea, is to be found in Uganda on 
leaves of all ages. The Glomerella stage has not yet been en- 
countered in nature, and the fungus has not been studied in pure 
culture.t The small areas of tea in the country are of the 
nature of experimental plots rather than commercial enterprises, 
and little attention has been given to them. An opportunity, 
however, was taken recently to inoculate some young tea plants 
with Colletotrichum conidia taken from cultures derived from 
both coffee and cacao material. Conidia were. placed on the 
apical bud of the stem, and introduced into the stem by 
punctured wounds, were placed on nodes and internodes of stems 
and also brought into contact With the nodal and internodal 
cortical tissues by means of wounds, and were placed on both 
surfaces of leaves. During a necessary absence of the writer 
from headquarters, the two series of experimental plants became 
mixed with the control plants. Results were thus rendered 
valueless; they were, however, very few. It was only in the 
ease of three plants out of twelve which were inoculated by 
internodal or nodal wounds that shrivelling of the young leaves 
and blackening of the inoculated stems were followed by the 
recovery of Colletotrichum in vitro. The conidia of the recovered 
fungus measured only 10-13 x 4 » and there were no setae. 
The leaf-inoculations seemed more successful, but could not be 
taken into account. It is thus impossible to assert that the tea 
Colletotrichum stands in the same relationship to Colletotrichum 
incarnatum or C. coffeanum as C. incarnatum does to C. coffeanum, 
but it ought to be noted that, com supe com camelliae is as 
similar to coffeanum as coffeanum to incarna 
- Colletotrichum on Garden Plants and eg of 
Colletotrichum have been found on garden plants of Codiaeum 
and Eranthemum which were dying back. They are morpholo- 
gically similar to each other and to C. coffeanum, but no cross- 
inoculation tests have yet been made in order to eludicate their 
relationships with each other or with the fungus found on coffee. 
Anthracnose of cotton-bolls is responsible for a certain 
amount of yearly loss in the cotton crop of Uganda. The causal 
fungus is usually confined to the bolls, and it may so penetrate 
* Cf. Dastur. Annals of Appd. Biology, VI. 4, 245, 1920. 
{+ The Brown Blight of tea in Assam, from which Massee’s original 
material came, has been shown by Tunstall (see ; Beeseainde of the Second 
‘Meeting of Mycological Workers in India, p. 56, Board of Agriculture in 
secre 1919) to be caused by G. cingulata, the perithecial stage having 
obtained in cultures. 
