Great Horsetail, West Dorset
 
 
Fertile stem - cone, brown and cream sheaths
 
 
Close-up of scales and spore cases
 
 
Sheath of fertile stem
 
 
Sterile vegetative stems in May
 
 
Closer view of whorls of branches in May
 
 
Sterile stems and branches in August
 
 
Close-up of branches in August
 
 
Patch of Great Horsetail