184 



t-ase bad the plant grown on a firmer substratum. Those found were 

 merely fragments of the tips of the thalhis and were thin oasts without 

 the markings which are characteristic- of the upper surface, and without 

 the rhizoids of the under surface. There was. indeed, nothing to dis- 

 tinguish the casts from those which might have been formed by any mem- 

 ber of the group, except the fact that they agreed in size and form with the 

 unmixed colony of this species which grows immediately above them. 

 Lafayette. Ixd.. November. 1905. 



