122 
Transactions of the Royal Society of South Africa. 
Irene natalensis Doidge is found on several species of Doryalis. The 
specimen selected was on the upper surface of the leaves of D. tristis, which 
have a thin cuticle. The penetrating filament has brown walls like those of 
Fig. 1. — Haustorium of Meliola Evansii penetrating into leaf of Scolopia, sp. 
(comp. oc. No. 8). All the figures were drawn with the aid of the camera 
lucida and a Zeiss ■Y\-in. oil-imm. obj. 
the mycelial hyphae, but very much thinner, and it passes through the 
epidermis into the first layer of palisade cells, the expanded vesicle being 
just within the latter. These haustoria differ from those of M. Evansii in 
the brown coloration of the walls of the penetrating filament. The latter 
may be at right angles to the leaf surface, but is very often oblique and 
sometimes its course is quite crooked or even tortuous. 
Irene puiggarii Speg., which occurs on a number of rosaceous hosts, is 
