﻿Vol. 
  47 
  

  

  No. 
  1 
  

  

  BULLETIN 
  

  

  OF 
  THE 
  

  

  TORREY 
  BOTANICAL 
  CLUB 
  

  

  JANUARY, 
  1920 
  

  

  Observations 
  on 
  monosporangial 
  discs 
  in 
  the 
  genus 
  L 
  

  

  Marshall 
  A. 
  Howe 
  

  

  (with 
  plate 
  I 
  AND 
  FIVE 
  TEXT-FIGURES) 
  

  

  The 
  genus 
  Liagora 
  is 
  a 
  group 
  of 
  marine 
  red 
  algae 
  of 
  the 
  family 
  

   Nemalionaceae 
  (Helminthocladiaceae) 
  , 
  The 
  species 
  are 
  con- 
  

   fined 
  to 
  the 
  warmer 
  seas, 
  where 
  they 
  show 
  a 
  preference 
  for 
  water 
  

   that 
  is 
  normally 
  agitated, 
  ranging, 
  however, 
  from 
  between 
  the 
  

   tide-lines 
  on 
  surf-beaten 
  rocks 
  down 
  to 
  a 
  depth 
  of 
  at 
  least 
  one 
  

   hundred 
  feet. 
  In 
  the 
  West 
  Indian 
  region, 
  including 
  Bermuda 
  

   and 
  southern 
  Florida, 
  the 
  genus 
  is 
  represented 
  by 
  nine 
  or 
  ten 
  

   species 
  and 
  one 
  species 
  is 
  known 
  to 
  occur 
  on 
  fhe 
  Californian 
  

   coast. 
  With 
  the 
  exception 
  of 
  one 
  species, 
  recently 
  described 
  from 
  

   Bermuda 
  by 
  Collins 
  & 
  Hervey,* 
  and 
  one 
  from 
  the 
  Mediterranean 
  

   Sea, 
  the 
  plant 
  body 
  is 
  more 
  or 
  less 
  calcified, 
  the 
  amount 
  of 
  the 
  

   lime 
  and 
  the 
  way 
  in 
  which 
  it 
  is 
  deposited 
  being 
  more 
  or 
  less 
  char- 
  

   acteristic 
  of 
  the 
  various 
  species. 
  Under 
  the 
  compound 
  micro- 
  

   scope 
  the 
  thallus 
  is 
  seen 
  to 
  be 
  of 
  an 
  obviously 
  filamentous 
  struc- 
  

   ture, 
  both 
  the 
  structure 
  and 
  the 
  often 
  lubricous 
  character 
  of 
  the 
  

   plants 
  when 
  living 
  sometimes 
  calling 
  to 
  mind 
  their 
  fresh-water 
  

  

  Batrachosp 
  

  

  Most 
  

  

  are 
  consistently 
  monoicous^-characters 
  that 
  hitherto 
  have 
  been 
  

   rarely 
  ascertained 
  or 
  mentioned 
  in 
  the 
  describing 
  of 
  species, 
  

   probably 
  because 
  the 
  antheridia 
  are 
  in 
  some 
  species 
  very 
  incon- 
  

   spicuous. 
  The 
  plants 
  rarely 
  seem 
  to 
  be 
  sterile. 
  Antheridia, 
  

  

  * 
  Proc. 
  Am. 
  Acad. 
  53; 
  100. 
  1917. 
  

   [The 
  Bulletin 
  for 
  December 
  (46: 
  461-502. 
  pL 
  iq) 
  was 
  issued 
  December 
  31, 
  1919.] 
  

  

  1 
  

  

  