82 
West. — On Stigeosporium Marattiaceartnn and 
p. 231 et seq.), which stain a dirty yellow after treatment with iodine and 
completely resist the action of concentrated sulphuric acid or potassium 
hydrate. The ‘ stalk ’ portion of the ‘ arbuscules ’ is more resistant to the 
Text- fig. 4. Disorganizing ‘arbuscules’ of Stigeosporium Marattiacearum , as seen in ( a ) 
a transverse section of a root and in (£) a longitudinal section of a root of Marattia Cooperi , Mre. 
n. = nucleus of host-cell, x 700 . 
Text-fig. 5 . Diagram showing position of the fungus within the tissues of the host-root. 
Note : Relative proportions are greatly exaggerated. 
enzymes, which are presumably secreted by the cytoplasm of the mycorrhizal 
cell, and persist for a considerable time after the complete disorganization of 
the ramifications (Text-fig. 4, a , b)} 
1 The cytological features connected with the digestion of fungal endophytes by their hosts have 
been carefully studied by Magnus (32), Shibata (40), and Kusano (30). 
