﻿189^-] 
  BOTANICAL 
  GAZETTE. 
  1 
  83 
  

  

  1 
  

  

  sexual 
  reproduction 
  could 
  be 
  found. 
  Having 
  found 
  the 
  asci 
  and 
  para- 
  

   physes 
  in 
  al] 
  cases 
  arising 
  together, 
  and 
  discovering 
  no 
  trace 
  of 
  sexual 
  re- 
  

   production, 
  he 
  was 
  led 
  to 
  re-examine 
  some 
  of 
  the 
  Collemacea3 
  with 
  a 
  view 
  

   to 
  establishing 
  or 
  disproving 
  Stahl's 
  well-known 
  conclusions. 
  His 
  in- 
  

   vestigations 
  were 
  entirely 
  confirmatory 
  of 
  Stahl's. 
  It 
  appears, 
  therefore, 
  

   that 
  we 
  have 
  among 
  the 
  homceomeric 
  lichens 
  two 
  types 
  of 
  sexual 
  repro- 
  

   duction, 
  while 
  among 
  the 
  heteromeric 
  species 
  the 
  reproduction 
  is 
  purely 
  

   vegetative, 
  as 
  it 
  is 
  in 
  some 
  ascomycetous 
  fungi, 
  ^ 
  

  

  The 
  paper 
  by 
  Mr. 
  Setchell 
  on 
  the 
  structure 
  and 
  development 
  of 
  

   Tuoineya 
  fluviatilis^ 
  very 
  aptly 
  supplements 
  the 
  recent 
  monograph 
  of 
  

   rofessor 
  Atkinson 
  on 
  the 
  Lemaneaceae 
  since 
  the 
  very 
  thorough 
  examin- 
  

   ation 
  to 
  which 
  the 
  author 
  has 
  subjected 
  it 
  shows 
  clearly 
  how 
  closely 
  it 
  

   unites 
  Lemanea 
  and 
  Batrachospermura. 
  

  

  iHE 
  EARLY 
  Stages 
  in 
  the 
  germination 
  of 
  the 
  macrospore 
  of 
  Isoetes 
  

   echmospora 
  show 
  a 
  remarkable 
  similarity 
  to 
  the 
  formation 
  of 
  the 
  endo- 
  

   sperm 
  in 
  the 
  conifers, 
  since 
  the 
  nucleus 
  divides 
  into 
  a 
  large 
  number 
  of 
  

   ( 
  aughter 
  nuclei 
  before 
  any 
  cell 
  walls 
  are 
  apparent. 
  Such 
  is 
  the 
  sub- 
  

   stance 
  of 
  a 
  brief 
  article 
  by 
  Professor 
  Douglas 
  H. 
  Campbell 
  in 
  the 
  Ber- 
  

   ichte 
  der 
  Deutschen 
  hot. 
  Gesells. 
  viii. 
  pp. 
  97-100, 
  pi. 
  1. 
  

  

  ^ir. 
  F. 
  H. 
  KxowLToN 
  has 
  just 
  issued 
  a 
  revision 
  of 
  the 
  genus 
  Arauca- 
  

  

  y 
  on 
  of 
  Kraus. 
  The 
  discussion 
  involves 
  the 
  presentation 
  of 
  three 
  

  

  genera, 
  Cordaites 
  (11 
  sp.), 
  Dadoxylon 
  (26 
  sp.), 
  and 
  Araucarioxylon 
  (13 
  sp.) 
  

  

  • 
  George 
  Walter 
  has 
  carefully 
  examined 
  the 
  brown 
  sclerotic 
  el- 
  

  

  nts 
  among 
  the 
  parenchymatous 
  tissues 
  of 
  the 
  rhizomes 
  of 
  a 
  large 
  

  

  rnber 
  of 
  ferns. 
  Particular 
  attention 
  was 
  given 
  to 
  the 
  isolated 
  groups 
  

  

  ^ 
  strands 
  of 
  cells 
  designated 
  by 
  Eussow 
  as 
  "StiLtzbiindel." 
  Dr. 
  Walter 
  

  

  J« 
  studied 
  the 
  development 
  of 
  the 
  cell-groups, 
  the 
  thickening 
  of 
  the 
  

  

  d*t 
  K*^*^ 
  ^^^^ 
  character 
  of 
  the 
  coloring 
  material 
  which 
  gives 
  them 
  their 
  

  

  ^ark 
  brown 
  or 
  almost 
  black 
  color. 
  These 
  coloring 
  matters 
  are 
  phlo- 
  

  

  Jp 
  lens, 
  and 
  begin 
  to 
  be 
  deposited 
  as 
  the 
  tissues 
  have 
  lost 
  their 
  power 
  

  

  ivision. 
  The 
  extraordinary 
  hardness 
  of 
  this 
  tissue 
  is 
  also 
  due 
  to 
  

  

  ^^^ 
  ^^^^^nce8, 
  which 
  are 
  either 
  chemically 
  united 
  with 
  the 
  cellulose 
  

  

  ^ 
  infaltrated. 
  The 
  many 
  interesting 
  details 
  must 
  be 
  sought 
  in 
  the 
  me- 
  

  

  ic«r 
  ^^^'^' 
  ^^^^^ 
  ^PP^^""^ 
  '^^ 
  °"^ 
  <^^ 
  the 
  parts 
  of 
  the 
  Bibliotheca 
  Botan- 
  

  

  *o^ 
  allie^d^^^' 
  ^^^^^^^^^ 
  C— 
  On 
  the 
  carpologic 
  structure 
  and 
  development 
  of 
  theCoIlemaceffl 
  

  

  from 
  the 
  P 
  ^^"^^" 
  Contrib. 
  from 
  the 
  Crypt. 
  Lab. 
  of 
  Harvard 
  University, 
  XI. 
  Reprinted 
  

  

  3g 
  '^^' 
  *'^^er. 
  Acad, 
  of 
  Arts 
  and 
  Sci. 
  Vol. 
  xxv, 
  pp. 
  15-52, 
  pi. 
  8. 
  8vo. 
  May, 
  l^'^. 
  

  

  flovJatliii^^^' 
  ^ViLLiAM 
  Albert.— 
  Concerning 
  the 
  structure 
  and 
  development 
  of 
  Tuomeya 
  

  

  Reprint- 
  

  

  ^ 
  from 
  P 
  ^^^"^y* 
  Contrib. 
  from 
  the 
  Crypt. 
  Lab. 
  of 
  Harvard 
  University. 
  XII. 
  

  

  ^^" 
  ^^' 
  ^^^'^' 
  '^'"^^ 
  ^^^ 
  ^^^- 
  PP- 
  ^■-^"^- 
  ^ 
  double 
  plate. 
  May, 
  1890. 
  

   •^^r 
  Farn^^"'-^^' 
  GEOHOE.-Ueber 
  die 
  braunwsndigen. 
  sklerotischen 
  Gewebeelemente 
  

   ^^tl8 
  r,!' 
  T^ 
  ^^sonderer 
  Beriicksichtigung 
  der 
  sog. 
  "SllUzbundel'* 
  Russow's. 
  Bibl. 
  bot. 
  

   • 
  PP- 
  "I- 
  Pl. 
  3. 
  4to. 
  Cassell 
  : 
  Theodor 
  Fischer. 
  M. 
  6. 
  

  

  