﻿I 
  

  

  t 
  

  

  1890. 
  J 
  

  

  BOTANICAL 
  GAZETTE 
  

  

  247 
  

  

  This 
  species, 
  which 
  is 
  sometimes 
  as 
  tall 
  and 
  stout 
  as 
  the 
  

   follovvmg, 
  is 
  distinguished 
  from 
  the 
  genuine 
  S. 
  subsecundum 
  

   as 
  well 
  as 
  from 
  S. 
  obesum, 
  by 
  the 
  pore 
  structure 
  of 
  the 
  branch 
  

   leaves. 
  The 
  pores 
  are 
  always 
  numerous 
  on 
  both 
  sides 
  (al- 
  

   though 
  less 
  so 
  on 
  the 
  inner) 
  and 
  are 
  small 
  with 
  strong 
  rings, 
  

   ine 
  color 
  of 
  the 
  tufts 
  is 
  sometimes 
  grass- 
  or 
  gra3'-green, 
  

   sometimes 
  brownish 
  red 
  or 
  dappled 
  with 
  green 
  and 
  red. 
  The 
  

   plant 
  is 
  a 
  water-lover, 
  but 
  also 
  occurs 
  in 
  drier 
  situations 
  ; 
  it 
  

   IS 
  seldom 
  found 
  completely 
  submersed 
  and 
  floating 
  in 
  water 
  

   like 
  the 
  following 
  species. 
  

  

  r. 
  Stem 
  leaves 
  in 
  form 
  and 
  cell-structure 
  like 
  the 
  preceding 
  but 
  

   ^1% 
  fewer 
  pores 
  on 
  both 
  sides. 
  Hyaline 
  cells, 
  as 
  a 
  rule, 
  

   tibrillose 
  quite 
  to 
  the 
  base. 
  Branch 
  leaves 
  large, 
  either 
  with 
  

   few 
  pores 
  on 
  both 
  sides, 
  or 
  on 
  the 
  outer 
  side 
  with 
  somewhat 
  

   more 
  numerous 
  pores 
  in 
  nearly 
  all 
  the 
  cell-angles, 
  but 
  never 
  

   in 
  uninterrupted 
  rows 
  as 
  in 
  the 
  preceding 
  species. 
  

  

  30. 
  S. 
  obesum 
  Wils. 
  Bryol. 
  Brit. 
  p. 
  22 
  (1855). 
  

  

  Syn.: 
  S. 
  subsecundum 
  var. 
  turgidum 
  C. 
  Miill. 
  Synops. 
  I, 
  p. 
  101 
  (1849)? 
  

   S, 
  turgidum 
  (C. 
  Miill.) 
  Roll, 
  Flora, 
  1886 
  ? 
  

  

  S. 
  decipims 
  Sull. 
  et 
  Lesq. 
  in 
  Herb. 
  Ke 
  

  

  w. 
  

  

  I 
  

  

  ) 
  

  

  ced 
  

  

  Virginia 
  {Lesquereux) 
  ; 
  New 
  Hampshire, 
  Crawford 
  House, 
  

  

  9?j° 
  V- 
  \ 
  Mass., 
  Lynn, 
  50 
  ft., 
  Boston, 
  50 
  ft. 
  {Faxon). 
  

  

  Ihis 
  is 
  a 
  truly 
  aquatic 
  plant; 
  it 
  is 
  usually 
  found 
  quite 
  

  

  submersed 
  and 
  floating. 
  Its 
  color 
  is, 
  like 
  that 
  of 
  the 
  pre- 
  

  

  ing 
  species, 
  extremely 
  variable, 
  sometimes 
  grayish 
  green, 
  

  

  ometimes 
  dark 
  brownish-red, 
  sometimes 
  variegated. 
  It 
  

  

  generally 
  assumes 
  a 
  plumose 
  habit 
  similar 
  to 
  that 
  of 
  certain 
  

  

  ^quatic 
  forms 
  of 
  the 
  Cuspidata. 
  It 
  mav 
  always 
  be 
  with 
  

  

  ertainty 
  distinguished 
  from 
  the 
  forms 
  "of 
  the 
  preceding 
  

  

  species, 
  which 
  it 
  often 
  closely 
  resembles 
  in 
  habit, 
  by 
  the 
  

  

  uch 
  scantier 
  pores 
  in 
  the 
  branch 
  leaves, 
  which, 
  even 
  if 
  

  

  °'"^y^umerous 
  on 
  the 
  outer 
  side, 
  never 
  occur 
  in 
  uninter- 
  

  

  Hi 
  ! 
  -k 
  '*^^^'^ 
  ^^^^ 
  strino-s 
  of 
  pearls, 
  but 
  onlv 
  more 
  plentifully 
  

  

  istnbuted 
  in 
  the 
  angles 
  of 
  the 
  cells, 
  

   standing 
  the 
  nearest 
  to 
  Sph. 
  obesum 
  in 
  habit 
  is 
  a 
  species 
  

   Pn^-^i 
  ^^^^"tly 
  distinguished 
  by 
  me, 
  Sph. 
  crassicladnm, 
  from 
  

   ^"gland 
  (Bot. 
  Centralblatt, 
  1889, 
  no. 
  45). 
  The 
  branch 
  

   nea^r 
  ^a^ 
  ^^'"^' 
  ^arge, 
  broad 
  roundish-ovate 
  to 
  longish-ovate, 
  

   tru 
  ' 
  ^^^^ 
  margins 
  not 
  involute; 
  the 
  apex 
  broadly 
  

  

  \Vl"^^^^i 
  '^"^ 
  ^ 
  ^° 
  9-toothed 
  ; 
  the 
  border 
  3 
  to 
  5 
  cell-rows 
  wide. 
  

   feeM^ 
  -^ 
  ^^^^ 
  leaves 
  are 
  slightly 
  glossy 
  and 
  the 
  margins 
  

  

  eoiy 
  undulate. 
  ,The 
  hyaline 
  cells 
  are 
  furnished 
  with 
  num- 
  

  

  fibn 
  .^"^^^^'f^^y 
  meniscoid-projecting 
  fibril-bands, 
  and 
  the 
  

  

  ^'s 
  m 
  the 
  upper 
  two-thirds 
  to 
  three-fourths 
  o( 
  the 
  leaf 
  on 
  

  

  