ROSELLINIA 233 



sort of natural sequence to planting on forest ground, judging 

 from material received at Kew from various parts of the 

 world. Wherever tree-stumps remain in the ground, the 

 mycelium spread from thence, and naturally attacks young, 

 growing roots. As the land becomes better cultivated this 

 pest gradually disappears, but not as a rule before early 

 crops have suffered. Kainit or sulphate of potash pricked 

 into the soil checks the underground spread of mycelium. 



Ascophores densely gregarious, seated on a black, velvety 

 mass, glabrous, mammilate ; asci cylindrical, 8-spored ; 

 spores elliptic-fusiform, slightly inaequilateral, continuous, 

 brown, 40-45 x 1 2 /A. Pycnidia subglobose, black, sparingly 

 pilose, stylospores elliptic-oblong, continuous ; hyaline, 



7-8X4;5/*- 



Conidiophores springing from black sclerotia, much 

 branched at apex, conidia hyaline, continuous, elliptic- 

 oblong, 7 X 4 ft. 



Stagnant water should not be allowed to remain in the 

 soil, as this favours the spread of the fungus. In cases where 

 the fungus has devastated large areas, it is probable that 

 such will be deserted as unprofitable, the tree being allowed 

 to lie and rot, and the fungus to spread in the soil. This is 

 disastrous, being in fact a nursery for the development and 

 diffusion of the enemy. It is not our object to suggest 

 whose business it is to prevent such short-sightedness, but to 

 impress emphatically that such a condition of things should 

 not be tolerated. 



Massee, Kew Bulletin, 1896, p. i. 

 Wight, Journ. MycoL, 5, p. 199. 



Seedling oak disease. Hartig has given a very exhaustive 

 account of a disease attacking the roots of seedling oaks. 

 In seed-beds where the plants from one to three years of 

 age are placed in close proximity to each other, and their 

 roots become intermixed, Rosellinia querdna (Hartig), the 

 fungus causing the disease, spreads rapidly in the ground 

 from one plant to another, by means of Rhizoctonia-like 

 mycelium. At times when the temperature is high and 

 moisture present, the disease quickly spreads through an 

 entire bed of seedlings. The first indication of injury is the 

 wilting and drying up of the leaves, the uppermost ones first 

 showing these symptoms, the lower leaves dying in turn, after 

 which the seedling perishes. When the root of a plant that 



