10 TREE ROOT DISEASES. 


Tinally, in those cases where the fungus has completely 
devastated large areas, it 1s probable that such will be 
deserted as unprofitable, the trees 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 the object of this note 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. 
DFSCRIPTION of the FIGURES, all of which illustrate Rosellinza 
radictperda. | 
Fig. 1, Ascigerous condition of the fungus, showing the 
perithecia, natural size. 
Fig. 2, perithecia enlarged. 
Fig 3, section of same, showing the wall to consist of two 
separate layers, enlarged. | 
Fig. 4, ascus containing spores, and paraphyses, x 400. 
Fig. 5, tip of ascus after treatment with a solution of iodine, 
showing the arrangement for effecting the opening or 
dehiscence of the ascus for the escape of the spores, x 400. 
Fig. 6, spores from an ascus, one of which is germinating, 
xX 650. } 
Tig. 7, brown mycelium, with swellings at intervals, x 500. 
Tig. 8, a black scleroctium bursting through the cortex of a 
root, from which spring several slender branches bearing 
conidia, xX 50. 
Fig. 9, a single thread composing the branches, branched 
and bearing conidia at the tip, x 400. 
Fig. 10, free conidia, x 400. 
lig. 11, a pycnidium springing from the olive mycelium 
enlarged. 
Fig. 12, stylospores or reproductive bodies produced in the 
interior of the pycnidia, x 400. 
