PLANT SUCCESSION'. 



233 



Aspergillus parasiticus. This Aspergillus also was not found 

 in mv culture from sugar, but Miss Church, of the United 

 States Department of Agriculture, informs me it has 

 been isolated from sugar by Kopeloff, in Louisiana. 



Aspergillus repens-glaucus group. Members of this group are 

 amongst the Aspergilli most frequently met with in sugar 

 here, and strains of them are considered in both of the 

 publications cited. They are also recorded from sugar 

 from Java and Louisiana. 



Manilla spp. Biowne mentions two species of Monilia from 

 Cuban raw sugar and records the result of their growth 

 in raw sugar solutions. So far I have not come across 

 ■Monilia in isolations from sugar, and the one found in 

 the air of a sugar mill is Monilia sitophila. 



In addition to the above fungi there were present three further 

 Penicillium spp. and a member of a group of Penicillia common 

 in soils and designated by Chas. Thorn and Miss Church in an 

 article by O. A. Pratt as the "Soil series Penicillia." 



The fungi above enumerated from the air of a sugar mill 

 belong to the groups which have been shown to be of considerable 

 economic importance to the sugar industry as they are, under 

 favourable conditions, amongst the more important of the micro- 

 organisms responsible for the deterioration of sugar in storage, 

 a problem which is at present receiving the attention of scientific 

 workers in all the great sugar producing countries. It is with 

 pleasure we acknowledge the assistance given us in our investiga- 

 tions by Dr. Chas. Thorn and Miss Margret Church, both of the 

 United States Department of Agriculture. 



THE PLANT SUCCESSION IN A TYPE OF MIDLAND 

 TREE VELD IN NATAL. 



BY 



R. D. AlTKEN, M.Sc, 



Natal University College. 



With Plate* /I, III, and 1 Map. 



Bead July 12, 1921. 





I. Introdution. 

 Attention has often been drawn to the wide areas of country 

 in South Africa which are covered by Tree Veld, and a preliminary 

 division of this type of vegetation into several formations has been 

 attempted (3)*, e.g., Acacia or Thorn Veld of the Eastern side; 

 Protea Veld of the higher altitudes; Bush Veld of the Transvaal. 

 There is no doubt, however, that the subdivision of climax associa- 

 tions can be carried still further, and this becomes particularlv 



*The numbers refer to the list of references at the end of this paper. 



9 



