﻿280 
  Hayxes: 
  Six 
  species 
  of 
  Riccia 
  

  

  subbasilarlbus. 
  — 
  In 
  a 
  garden 
  at 
  Jacksonville, 
  Florida, 
  Feb., 
  

   1877.—/. 
  Donnell 
  Smith.'' 
  . 
  . 
  

  

  Habitat: 
  in 
  gardens 
  and 
  waste 
  places, 
  usually 
  on 
  sand. 
  

   Distribution: 
  Florida 
  and 
  Texas. 
  

   Exsiccatae: 
  Underw. 
  & 
  Cook, 
  Hep. 
  Amer. 
  42. 
  

  

  2. 
  Riccia 
  dictyospoil\ 
  M. 
  A. 
  Howe, 
  BulL 
  Torrey 
  Club 
  28: 
  

  

  163. 
  1901 
  

  

  "Thallus 
  simple 
  or 
  once 
  dichotomous, 
  forming 
  irregularly 
  

   gregarious 
  patches, 
  finally 
  oblong 
  or 
  elongate-obovate, 
  rarely 
  sub- 
  

   linear, 
  4-10 
  mm. 
  X 
  1-2 
  mm., 
  reticulate 
  above, 
  light 
  green 
  (when 
  

   dry) 
  with 
  at 
  length 
  a 
  narrow 
  dark-purple 
  border; 
  median 
  sulcus 
  

   acute 
  and 
  somewhat 
  pronounced 
  toward 
  the 
  apex; 
  ventral 
  scales 
  

   entire, 
  purple 
  at 
  maturity, 
  slightly 
  exceeding 
  the 
  thin 
  submem- 
  

   branous 
  ascending 
  thallus-margins; 
  width 
  of 
  transverse 
  sections 
  of 
  

   the 
  thallus 
  1.5-3 
  times 
  their 
  height, 
  the 
  ventral 
  outline 
  rounded- 
  

   convex 
  or 
  somewhat 
  flattened, 
  air-canals 
  narrow 
  and 
  vertical, 
  

   special 
  cells 
  densely 
  filled 
  with 
  a 
  yellowish 
  granular 
  substance 
  

   ('oil-body' 
  cells) 
  usually 
  abundant; 
  primary 
  epidermal 
  cells 
  

   oval-papilliform, 
  soon 
  collapsing, 
  leaving 
  more 
  or 
  less 
  persistent 
  

   cup-like 
  vestiges: 
  monoicous; 
  antheridial 
  ostioles 
  not 
  elevated: 
  

   spores 
  brown, 
  rather 
  translucent, 
  soon 
  exposed 
  by 
  the 
  rupture 
  of 
  

   the 
  overlying 
  parts, 
  95-116 
  ju 
  in 
  maximum 
  diameter, 
  scarcely 
  

   angled, 
  somewhat 
  flattened, 
  wholly 
  destitute 
  of 
  wing-margins, 
  

   almost 
  uniformly 
  areolate 
  over 
  entire 
  surface, 
  in 
  optical 
  section 
  

   appearing 
  densely 
  beset 
  on 
  all 
  sides 
  with 
  short 
  truncate 
  spines 
  or 
  

   papillae; 
  areolae 
  of 
  the 
  outer 
  face 
  8-12 
  ^i 
  in 
  width, 
  often 
  less 
  

   perfect 
  in 
  the 
  middle 
  of 
  the 
  face; 
  areolae 
  of 
  the 
  inner 
  faces 
  so 
  

   similar 
  to 
  those 
  of 
  the 
  outer 
  as 
  not 
  to 
  be 
  readily 
  distinguished 
  

  

  less 
  elevated 
  boundaries. 
  

  

  gul 
  

  

  "On 
  moist 
  granite 
  rock 
  near 
  Oconee 
  River, 
  Athens, 
  Georgia 
  

   (alt. 
  183 
  m.), 
  Roland 
  M. 
  Harper, 
  June 
  26, 
  1900, 
  no. 
  68a." 
  

   Habitat: 
  moist 
  granite 
  rocks. 
  

   Distribution: 
  Connecticut 
  and 
  Georgia. 
  

   Exsiccatae: 
  Harper, 
  Georgia 
  Plants 
  68a. 
  

  

  h 
  

   + 
  

  

  i 
  

  

  3. 
  Riccia 
  Beyrichiana 
  Hampe; 
  Lehm. 
  & 
  Lindenb. 
  in 
  Lehm. 
  

  

  Pugill. 
  7: 
  I. 
  1838 
  

  

  "R. 
  fronde 
  carnosa 
  ohlongo-lineari 
  bifida, 
  supra 
  canalictdata, 
  

   margine 
  adscendente 
  mtegerrima, 
  subtus 
  nigro-purptirascente, 
  apicem 
  

   versus 
  tncrassata. 
  

  

  