genus Hormotriclum  for  this  latter  group,  adding  to  it,  as  that  
 author  has  done,  Conferva  bangioides,  C.  Youngana,  and  probably  
 C. collabens,  a  species  of  which  but  little  is  yet  known.  
 In  any  future  work  I  should  probably bring these  species  together  
 under  one  generic  head,  as  they  certainly  have  characters  
 in  common with  each  other,  and  such  of  them as have,  like  the  
 present,  been  classed  with  the  Lyngbyce  differ  from  the  type  of  
 that  genus  in having  a  distinctly  articulated  filament. 
 I have  frequently  observed  C.facca  put  forth  the  root-like,  
 proliferous branches  given  in  our  plate. 
 ■3 i 
 .  ■  gL  
 I. ill 
 Fig.  1 .  Tufts  of  L y n g b y a   I-LAOCA gTowing on  purpurascens-.— n 
 °  ral size.  2.  Portions  of filaments from the  same;—Mglili/ magnified.