xri.] NEW DISEASE OF GKASS. 57 



colour the fungus might be easily overlooked, and it must 

 be remembered that the original description states the 

 plant to be " pallid." A pallid condition of this fungus 

 may therefore possibly be widespread and unnoticed. 

 In some places and seasons the fungus may be always 

 pallid, and so virtually invisible. When the fungus 



FIG. 18. 



Stems of Sheep's Fescue Grass, with Isaria fuciformis, Berk. 

 Enlarged 5 diameters. 



exhibits the scarlet colour, the tint appears to be per- 

 manent, for no change has been observed in the colour of 

 our dried herbarium examples. In this permanency of 

 colour it resembles the beautiful and closely-allied orange- 

 coloured Anthina flammea, Fr., so common on the dead 

 beech leaves of our autumn woods. 



In reaching England from Australia this fungus has 

 taken the same course as the Pucdnia of our hollyhocks 

 and the Capnodium of our Thuyas. 



The structure of 'Isaria fuciformis, B., is very simple, 

 as is the case with all imperfect fungi. The whole sub- 

 stance of the parasite is one compacted mass of minute 

 cells or exceedingly small transparent bladders, as illus- 



