68 



BOTANICAL GAZETTE 



[JANUARY 



partly by Polytrichum, and sometimes by a species of grass. In 

 many spots these knolls are absolutely bare save for a few plants 

 of P olytrichum . It was in these knolls that all but 2 of the 21 

 prothallia were found, as well as most of the sporelings. 



Figs. 1-8. 



specimen 



openings 



form the lobes entirely, Xs; figs. 4, 5, prothallia of L. obscurum (?), crown is double, 

 XSJ figs. 6-8, prothallia of L. clavatum; in fig. 6 the antheridial lobes are marked as 

 in figs. 1 and 2; in fig. 7 the lobed edge is double; Xio. 



The frequent occurrence of sporelings and prothallia on these 

 small, bare, exposed elevations suggests the idea that those spores 

 which fall in such localities are first of all beaten into the ground 



