﻿Taxonomic 
  Anomalies 
  669 
  

  

  at 
  the 
  base 
  united. 
  The 
  lemon-scented 
  Euca- 
  

   lyptus 
  citriodora 
  is 
  one 
  of 
  the 
  most 
  widely 
  

   known 
  cases. 
  In 
  other 
  instances 
  the 
  peltate 
  

   leaves 
  become 
  more 
  or 
  less 
  hollow, 
  constituting 
  

   broad 
  ascidia 
  as 
  in 
  the 
  case 
  of 
  the 
  crassulaceous 
  

   genus 
  Umbilicus. 
  

  

  This 
  connation 
  of 
  the 
  basal 
  lobes 
  is 
  universal- 
  

   ly 
  considered 
  as 
  a 
  good 
  and 
  normal 
  specific 
  

   character. 
  Nevertheless 
  it 
  has 
  its 
  manifest 
  

   analogy 
  in 
  the 
  realm 
  of 
  the 
  anomalies. 
  This 
  is 
  

   the 
  pitcher 
  or 
  ascidium. 
  On 
  some 
  trees 
  it 
  is 
  of 
  

   quite 
  common 
  occurrence, 
  as 
  on 
  the 
  lime-tree 
  

   (Tilia 
  parvifolia) 
  and 
  the 
  magnolia 
  (Magnolia 
  

   obovata 
  and 
  its 
  hybrids). 
  It 
  is 
  probable 
  that 
  

   both 
  these 
  forms 
  have 
  varieties 
  with, 
  and 
  others 
  

   without, 
  ascidia. 
  Of 
  the 
  lime-tree, 
  instances 
  are 
  

   known 
  of 
  single 
  trees 
  which 
  produce 
  hundreds 
  

   of 
  such 
  anomalous 
  leaves 
  yearly, 
  and 
  one 
  such 
  a 
  

   tree 
  is 
  growing 
  in 
  the 
  neighborhood 
  of 
  Amster- 
  

   dam 
  at 
  Lage 
  Vuursche. 
  I 
  have 
  alluded 
  to 
  these 
  

   cases 
  more 
  than 
  once, 
  but 
  on 
  this 
  occasion 
  a 
  

   closer 
  inspection 
  of 
  the 
  structure 
  of 
  the 
  ascidium 
  

   is 
  required. 
  For 
  this 
  purpose 
  we 
  may 
  take 
  the 
  

   lime-tree 
  as 
  an 
  example. 
  Take 
  the 
  shape 
  of 
  the 
  

   normal 
  leaves 
  in 
  the 
  first 
  place. 
  These 
  are 
  cor- 
  

   date 
  at 
  their 
  base 
  and 
  mainly 
  inequilateral, 
  but 
  

   the 
  general 
  shape 
  varies 
  to 
  a 
  considerable 
  ex- 
  

   tent. 
  This 
  variation 
  is 
  closely 
  related 
  to 
  the 
  

   position 
  of 
  the 
  leaves 
  on 
  the 
  twigs, 
  and 
  shows 
  

  

  