﻿458 
  JOURNAL 
  OF 
  THE 
  WASHINGTON 
  ACADEMY 
  OF 
  SCIENCES 
  VOL. 
  12, 
  NO. 
  20 
  

  

  ample, 
  subcoriaceous, 
  and 
  subentire, 
  and 
  closes 
  against 
  it, 
  as 
  if 
  hinged 
  on 
  the 
  

   transverse 
  receptacle. 
  

  

  In 
  these 
  particulars 
  the 
  resemblance 
  of 
  Culcita 
  straminea 
  to 
  the 
  Australian 
  

   plant 
  described 
  as 
  DavalUa 
  duhia 
  R. 
  Br. 
  is 
  slight, 
  yet 
  the 
  two 
  have 
  been 
  greatly 
  

   confused. 
  The 
  original 
  description 
  of 
  DavalUa 
  duhia 
  reads 
  as 
  follows 
  : 
  "Fron- 
  

   dibus 
  supradecompositis, 
  foliolis 
  2-3-pinnatis 
  pubescentibus, 
  pinnulis 
  lineari- 
  

   lanceolatis 
  incisis, 
  involucris 
  subrotundis 
  fimbriatis 
  subaxillaribus 
  lobulo 
  

   saepe 
  reflexo 
  semitectis. 
  (J. 
  D.) 
  v. 
  t;." 
  The 
  specimens 
  were 
  from 
  Port 
  

   Jackson 
  (New 
  South 
  Wales) 
  and 
  Tasmania. 
  The 
  numerous 
  Australian 
  

   specimens 
  at 
  hand 
  (cited 
  hereafter) 
  agree 
  perfectly 
  with 
  Brown's 
  description 
  

   in 
  having 
  the 
  marginal 
  lobule 
  opposite 
  to 
  the 
  sorus 
  often 
  reflexed 
  and 
  some- 
  

   times 
  partially 
  protecting 
  the 
  sori 
  ; 
  but 
  the 
  sorus 
  is 
  relatively 
  distant 
  from 
  the 
  

   margin, 
  the 
  marginal 
  lobule 
  is 
  not 
  at 
  all 
  modified 
  and 
  is 
  never 
  saccate, 
  and 
  

   the 
  true 
  indusium 
  is 
  membranous 
  and 
  conspicuously 
  dentate-ciliate, 
  is 
  

   early 
  thrust 
  back 
  against 
  the 
  leaf 
  surface, 
  and 
  in 
  form, 
  structure, 
  texture, 
  and 
  

   position 
  is 
  so 
  unlike 
  the 
  marginal 
  lobule 
  that 
  it 
  can 
  hardly 
  be 
  regarded 
  as 
  

   forming 
  any 
  part 
  of 
  a 
  "double" 
  indusium. 
  In 
  these 
  respects 
  C. 
  duhia 
  differs 
  

   so 
  definitely 
  from 
  Culcita 
  proper 
  that 
  it 
  ought 
  at 
  least 
  to 
  be 
  regarded 
  as 
  the 
  

   type 
  of 
  a 
  new 
  subgenus. 
  The 
  details 
  of 
  structure 
  are 
  shown 
  fairly 
  well 
  in 
  

   Hooker's 
  plate 
  24, 
  figure 
  C.^ 
  

  

  The 
  Fiji 
  plant 
  listed 
  by 
  Brackenridge 
  in 
  1854 
  as 
  Sitolohium 
  stramineum 
  is 
  

   not 
  Culcita 
  straminea, 
  but 
  a 
  new 
  species 
  very 
  closely 
  allied 
  to 
  the 
  DavalUa 
  

   duhia 
  of 
  Robert 
  Brown. 
  It 
  is 
  described 
  below. 
  

  

  Not 
  all 
  of 
  the 
  Reinecke 
  plants 
  from 
  Samoa 
  distributed 
  as 
  DavalUa 
  moluc- 
  

   cana 
  Blume 
  or 
  one 
  of 
  its 
  varieties 
  pertain 
  to 
  C. 
  straminea. 
  The 
  following 
  

   numbers, 
  as 
  represented 
  in 
  the 
  National 
  Herbarium, 
  belong 
  to 
  Saccoloma 
  

   moluccanum 
  (Blume) 
  Mett., 
  regarding 
  that 
  species 
  in 
  its 
  usual 
  widely 
  col- 
  

   lective 
  sense: 
  Reinecke 
  71 
  and 
  97a, 
  4 
  sheets, 
  from 
  Upolu; 
  Reinecke 
  143, 
  

   from 
  Savaii. 
  

  

  7. 
  Culcita 
  dubia 
  (R. 
  Br.) 
  Maxon. 
  

  

  DavalUa 
  duhia 
  R. 
  Br. 
  Prodr. 
  Fl. 
  Nov. 
  HoU. 
  157. 
  1810. 
  

  

  Dicksonia 
  duhia 
  Gaud, 
  in 
  Freyc. 
  Voy. 
  Bot. 
  367. 
  1827. 
  

  

  ? 
  Balantium 
  hrownianum 
  Presl, 
  Tent. 
  Pter. 
  134. 
  pi. 
  5,/. 
  4. 
  1836. 
  

  

  Sitolohium 
  duhium 
  Brack, 
  in 
  Wilkes, 
  U. 
  S. 
  Expl. 
  Exped. 
  16: 
  273. 
  1854. 
  

  

  As 
  noted 
  under 
  the 
  last 
  preceding 
  species 
  DavalUa 
  duhia 
  was 
  founded 
  on 
  

   material 
  from 
  New 
  South 
  Wales 
  and 
  Tasmania. 
  Luerssen^" 
  cites 
  four 
  col- 
  

   lections 
  from 
  the 
  Fiji 
  group 
  as 
  Dicksonia 
  duhia, 
  but 
  they 
  doubtless 
  pertain 
  to 
  

   the 
  next 
  species, 
  C. 
  hlepharodes. 
  As 
  represented 
  in 
  the 
  National 
  Herbarium 
  

   C. 
  duhia 
  is 
  confined 
  to 
  Australia, 
  the 
  specimens 
  being 
  as 
  follows 
  : 
  

  

  Australia: 
  Vicinity 
  of 
  Sidney, 
  New 
  South 
  Wales, 
  Wright; 
  Darnel 
  (ex 
  

   herb. 
  Bot. 
  Mus. 
  Hamburg); 
  Wilkes 
  Exped. 
  (2 
  sheets, 
  as 
  Sitolohium 
  duhium). 
  

  

  ' 
  Sp. 
  Fil., 
  vol. 
  1, 
  1844, 
  as 
  Dicksonia 
  dubia 
  (R. 
  Br.) 
  Gaud. 
  

   10 
  Fil. 
  Graeff. 
  233. 
  1871. 
  

  

  