﻿260 
  INTRODUCTION 
  TO 
  BOTANY 
  

  

  that 
  a 
  single 
  plant 
  (7V///</v/x 
  ^jinnnosus') 
  may 
  produce 
  as 
  

   many 
  as 
  11,000,000 
  spores. 
  The 
  same 
  authority 
  states 
  that 
  

   one 
  "shaggy 
  mane" 
  (f 
  '/y<r//^x 
  <-"ntn(nx) 
  mushroom 
  may 
  pro- 
  

   duce 
  5,000,000,000 
  spores. 
  It 
  is 
  obvious 
  that 
  only 
  a 
  small 
  

   11 
  umber 
  of 
  these 
  spores 
  succeed 
  in 
  producing 
  nc\v 
  plants; 
  

   otherwise 
  they 
  would 
  very 
  soon 
  occupy 
  the 
  earth. 
  

  

  246. 
  Puffballs. 
  One 
  of 
  the 
  most 
  important 
  differences 
  be- 
  

   tween 
  puff 
  halls 
  (fig. 
  202) 
  and 
  mushrooms 
  is 
  that 
  puffballs 
  

   produce 
  their 
  spores 
  within 
  an 
  inclosed 
  reproductive 
  body 
  

   instead 
  of 
  upon 
  gills 
  or 
  within 
  pores. 
  Puffballs 
  may 
  become 
  

   quite 
  large, 
  even 
  a 
  foot 
  in 
  diameter, 
  and, 
  when 
  ripe, 
  may 
  con- 
  

   tinue 
  to 
  emit 
  small 
  clouds 
  of 
  spores 
  intermittently 
  for 
  several 
  

   years. 
  One 
  giant 
  puff 
  ball 
  (Ly 
  coper 
  don 
  giganteum) 
  was 
  esti- 
  

   mated 
  ! 
  to 
  contain 
  7,000,000,000,000 
  spores. 
  

  

  247. 
  Classification 
  of 
  the 
  thallophytes. 
  The 
  following 
  is 
  the 
  

   classification 
  of 
  the 
  thallophytes, 
  including 
  the 
  chief 
  genera 
  

   that 
  we 
  have 
  considered. 
  This 
  classification 
  is 
  placed 
  here 
  for 
  

   use 
  as 
  a 
  general 
  summary, 
  and 
  not 
  primarily 
  to 
  be 
  committed 
  

   to 
  memory. 
  If 
  studied 
  carefully, 
  it 
  will 
  give 
  a 
  good 
  review 
  

   of 
  the 
  three 
  chapters 
  on 
  the 
  groups 
  of 
  thallophytes. 
  

  

  GROUP 
  A. 
  THAI.I.OPIIYTES. 
  Since 
  the 
  l>arteria 
  ami 
  the 
  blue-green 
  algje 
  

   are 
  so 
  much 
  alike 
  in 
  structure 
  and 
  in 
  methods 
  of 
  reproduction, 
  they 
  are 
  

   classified 
  together 
  rather 
  than 
  with 
  the 
  fungi 
  and 
  alg;e 
  respeeth 
  ely. 
  

   CLASS 
  I. 
  Scm/.oi'iiYTKS 
  (the 
  fission 
  plants) 
  

  

  SUB-CLASS 
  I. 
  SCHI/.OMYCKTKS 
  (bacteria, 
  or 
  fission 
  fungi). 
  Illus- 
  

   trated 
  liy 
  numerous 
  type 
  forms 
  and 
  various 
  methods 
  of 
  living 
  

   SUB-CLASS 
  II. 
  Sciiizorin 
  < 
  r 
  K, 
  or 
  Cyanophyceje 
  (the 
  blue-greru 
  

   algre, 
  or 
  the 
  fission 
  alg:e). 
  Leading 
  genera 
  used 
  as 
  illustrations 
  

   Noxtoc, 
  Oscillator 
  ia 
  

   CLASS 
  II. 
  A 
  I.C.K 
  

  

  Srit-CLASS 
  I. 
  CHLOROPHYCK.K 
  (the 
  green 
  algae). 
  Leading 
  genera 
  

   used 
  as 
  illustrations 
  Pleurococcus, 
  Xj>imi/f/r<i, 
  Cladophora, 
  

   Vaucheria, 
  Chant 
  

   SUB-CLASS 
  II. 
  PHJEOPHYCE.* 
  (the 
  brown 
  algse). 
  Leading 
  genera 
  

  

  used 
  as 
  illustrations 
  /'(>/>, 
  >'<//////>>(//// 
  

  

  SUB-CLASS 
  III. 
  KIKIDOI-IIYC 
  i:.i: 
  (the 
  red 
  algje). 
  Leading 
  genns 
  

   used 
  as 
  illustration 
  Dasya 
  

  

  1 
  Buller, 
  A. 
  II. 
  R., 
  Researches 
  on 
  Fungi. 
  Longmans, 
  Green 
  & 
  Co., 
  1909. 
  

  

  