Form of Hormidium jlaccidum, A . Braun . 537 
rarely passes beyond this first stage of desiccation, as the spells of dry 
weather in temperate regions are comparatively short, and dew is continually 
deposited, especially in summer when the drought is most extreme. 
I have pleasure in recording my thanks to Dr. F. E. Fritsch for his 
valuable help and suggestions throughout the progress of the work. My 
thanks are also due to Dr. E. J. Salisbury for helpful suggestions. I am 
glad of the opportunity to acknowledge that facilities for this research were 
provided by a scholarship of the Fishmongers’ Company. 
