NOTES ON THE FLORA OF IOWA. 



217 



have rediscovered Berkeley's species which has been repre- 

 sented, apparently, so far by but a single specimen of unknown 

 origin. 



It should be remarked, however, that the outer peridium,as 

 such, was probably not noticed by Berkeley. It is extremely 

 delicate and very persistent as a red covering of the peridium 

 proper. In older and weathered specimens the outer peridium 

 resembles simply a tinge or stain, and its true character 

 would not be apparent from such a specimen; but in younger, 

 fresher specimens the two peridia are sufficiently distinct. 

 The capillitium is very delicate and shows a tendency to 

 become discrete from the peridium suggesting so far Fries' 

 genus Lanopila. 



Saccardo for some reason does not have B. later it ia. I am 

 indebted to Mr. A. P. Morgan for calling my attention to 

 Berkeley's description. 



