714 
Transactions of the Royal Society of South Africa. 
Many of these have been described only in general terms, and in some 
cases wrongly diagnosed, and this has caused considerable confusion. Those 
species which have been adequately described have been published in 
periodicals not readily accessible. I have therefore given in full the descrip- 
tions of known species as well as of new ones. 
I am indebted to Miss S. M. Stent for the determination of the greater 
part of the host plants, and to "Dr. J. Medley Wood, Professor J. W. Bews, 
and Miss M. Franks (Mrs. Howard Flanders) for the identification of a 
number of plants collected in Natal. I should also like to express my in- 
debtedness to Miss A. Pegler and others who have contributed a number of 
interesting specimens. 
A series of permanent microscopic preparations has been made of all the 
fungi examined, and is kept for reference in the Union Botanical Laboratory, 
Pretoria, where it may be seen by anyone who is interested in this group 
of fungi. The method adopted in preparing the slides is a modification of 
that used by Gaillard, the procedure being as follows : The fungus colony 
on the leaf surface is covered with a drop of collodion made according to the 
following formula : 
Soluble guncotton .... 4 parts. 
Absolute alcohol . . . . 10 „ 
Ether 32 „ 
Castor oil .... 2 „ 
Lactic acid 2 „ 
This formula, which is the one used by G-aillard, was found to form a 
collodion rather too thick for most purposes, and can be made more fluid by 
diluting by one-third to one-half with a mixture of — 
Alcohol absolute . . . .10 parts. 
Ether 32 „ 
The drop of collodion is allowed to dry on the leaf, and the pellicle thus 
formed is then carefully detached and placed on a glass slide. The fungus 
colony adheres to the collodion, and can thus be placed on the slide in the 
exact position which it occupied on the leaf. The collodion is now re- 
dissolved by means of the mixture of alcohol and ether mentioned above, 
and the preparation may be dehydrated and mounted in Canada balsam. 
In the enumeration of species which follows, unless other wise stated, the 
numbers in brackets refer to the numbers in the Union Mycological 
Herbarium, which have been quoted by Sydow as I. B. Pole Evans' 
numbers. Among the specimens in the herbarium by far the greater number 
belong to the genus Meliola, of which over thirty species are described ; and 
in the grouping of the species of this genus Gaillard's classification is 
followed, which is based on the septation of the spores and the presence and 
form of mycelial and perithecial setae. 
All drawings have been made with the aid of the camera lucida, and are 
