120 FLOWERLESS PLANTS 



the PelUgera canina, a ven^ handsome species 

 which is abundant in many country districts 

 upon mossy banks, or in moist places upon 

 moors. WTien dry, the plant is rather an un- 

 attractive grey colour ; but in the moist autumn 

 weather it assumes a rich green tint. The 

 under side of the growth is of a shining white, 

 and from this spring a number of " roots," by 

 means of which an attachment is secured. The 

 fructifications consist of bright brown lobes 

 which arise from the border of the growth. 

 The specific name of the plant is due to the 

 fact that it was at one time considered to be a 

 remedy for hydrophobia. In the case of many 

 of the leafy hchens the manner of growth is 

 in the form of a rosette. Many kinds belong- 

 ing to the genus Parmelia may be found in the 

 greatest abundance upon tree-trunks and rocks. 

 One of the commonest is P. physodes, which 

 forms large rounded patches which may be as 

 much as a foot across. It is of a grey-green 

 colour above, and is brown on the under side. 

 Another species, P. piilveriilenta, is also very 

 common on trees. In a moist state it is of a 

 deep green colour, although it assumes a paler 

 hue when the growth is dry. This lichen 



