﻿FUNGI 
  AND 
  FUNGOUS 
  DISEASES 
  OF 
  PLANTS 
  261 
  

  

  CLASS 
  III. 
  FUNGI 
  

  

  Si 
  IJ-CLASS 
  I. 
  PHYCOMYCETES 
  (the 
  algae-fungi). 
  Leading 
  genera 
  

   used 
  as 
  illustrations 
  Rhizopus 
  (bread 
  mold), 
  Plasmopara 
  

   (grape 
  downy 
  mildew), 
  PhyiopTitkora 
  (potato 
  blight) 
  

  

  SUB-CLASS 
  II. 
  ASCOMYCETES 
  (the 
  sac 
  fungi). 
  Leading 
  genera 
  

   used 
  as 
  illustrations 
  Sclcrotlnia 
  (brown 
  rot), 
  Miscrosphnera 
  

   (lilac 
  mildew), 
  Morchella 
  (morel), 
  Penicillium 
  (blue 
  mold), 
  

   Saccharomyces 
  (yeast) 
  

  

  SUB-CLASS 
  III. 
  LICHENS. 
  Leading 
  genera 
  used 
  as 
  illustrations 
  

   -Parmdia, 
  Usnea 
  (bearded 
  moss), 
  Cladonia 
  

  

  SUB-CLASS 
  IV. 
  BASIDIOMYCETES 
  (the 
  basidium 
  fungi). 
  Leading 
  

   genera 
  used 
  as 
  illustrations 
  Ustilago 
  (smut), 
  Puccinia 
  (rust), 
  

   Coprinus 
  and 
  Pobjporus 
  (mushrooms), 
  Lycoperdon 
  (puffball) 
  

  

  PROBLEMS 
  

  

  1. 
  Why 
  docs 
  bread 
  "mold"? 
  How 
  can 
  it 
  be 
  prevented 
  from 
  doing 
  so? 
  

  

  2. 
  Why 
  is 
  it 
  that 
  a 
  plant 
  disease 
  newly 
  introduced 
  into 
  a 
  country 
  

   seems 
  to 
  spread 
  more 
  rapidly 
  and 
  to 
  prove 
  more 
  destructive 
  than 
  

   diseases 
  that 
  have 
  long 
  been 
  in 
  that 
  country? 
  

  

  3. 
  Can 
  you 
  account 
  for 
  the 
  fact 
  that 
  lilac 
  bushes 
  seem 
  to 
  be 
  fairly 
  

   thrifty 
  even 
  though 
  they 
  are 
  infested 
  with 
  lilac 
  mildew 
  ? 
  

  

  4. 
  Why 
  are 
  lichens 
  sometimes 
  called 
  "the 
  advance 
  guard 
  of 
  vege- 
  

   tation 
  " 
  ? 
  

  

  5. 
  If 
  you 
  can 
  secure 
  the 
  data 
  from 
  published 
  reports, 
  or 
  can 
  perform 
  

   an 
  experiment 
  for 
  the 
  purpose, 
  determine 
  the 
  difference 
  in 
  yield 
  that 
  

   may 
  be 
  made 
  by 
  selecting 
  or 
  treating 
  seed 
  oats 
  or 
  corn 
  so 
  as 
  to 
  remove 
  

   the 
  smut 
  disease. 
  What 
  percentage 
  of 
  gain 
  on 
  the 
  crop 
  may 
  be 
  made 
  

   in 
  this 
  way? 
  

  

  6. 
  Under 
  what 
  circumstances 
  may 
  fungi 
  that 
  are 
  parasitic 
  upon 
  

   plants 
  or 
  animals 
  be 
  of 
  service 
  to 
  the 
  farmer 
  or 
  gardener? 
  

  

  7. 
  Why 
  are 
  railroad 
  ties 
  and 
  other 
  timbers 
  often 
  treated 
  with 
  poison- 
  

   ous 
  solutions 
  before 
  they 
  are 
  used 
  ? 
  

  

  8. 
  Discover 
  from 
  first-hand 
  study 
  or 
  from 
  publications 
  the 
  life 
  history 
  

   of 
  some 
  of 
  the 
  worst 
  fungous 
  parasites 
  of 
  your 
  locality. 
  

  

  