﻿Williams: 
  Calymperaceae 
  of 
  North 
  America 
  395 
  

  

  rounded 
  to 
  the 
  scarcely 
  acute 
  apex 
  and 
  with 
  very 
  distinct 
  teniolae 
  

   of 
  three 
  or 
  four 
  thicknesses 
  of 
  cells 
  and 
  five 
  or 
  six 
  cells 
  wide 
  ex- 
  

   tending 
  from 
  some 
  little 
  distance 
  above 
  the 
  base 
  to 
  about 
  an 
  equal 
  

   distance 
  below 
  the 
  apex, 
  with 
  three 
  to 
  six 
  rows 
  of 
  cells 
  between 
  

   the 
  tenola 
  and 
  margin; 
  costa 
  about 
  looju 
  wide 
  a 
  little 
  above 
  the 
  

   base, 
  nearly 
  percurrent, 
  in 
  cross-section, 
  showing 
  five 
  or 
  six 
  guide- 
  

   cells, 
  large 
  stereid 
  bands 
  above 
  and 
  below 
  them 
  and 
  outer 
  cells 
  

   somewhat 
  differentiated; 
  cells 
  of 
  blade 
  in 
  upper 
  leaf 
  mostly 
  

   roundish 
  or 
  slightly 
  elongate, 
  mamillose 
  on 
  the 
  ventral, 
  flat 
  on 
  

   the 
  dorsal 
  side, 
  the 
  median 
  cells 
  6-7 
  )u 
  in 
  diameter, 
  gradually 
  

   changing 
  toward 
  the 
  base 
  to 
  the 
  not 
  very 
  numerous 
  rectangular 
  

   cells 
  which 
  are 
  more 
  or 
  less 
  colored 
  and 
  never 
  form 
  distinct 
  can- 
  

   cellinae. 
  [Fig. 
  12.] 
  

  

  Type 
  collected 
  in 
  the 
  vicinity 
  of 
  Utuado, 
  Porto 
  Rico, 
  on 
  wet 
  

   rocks, 
  March, 
  1915', 
  E. 
  G. 
  Britton 
  5206 
  (herbarium 
  of 
  the 
  New 
  York 
  

   Botanical 
  Garden). 
  

  

  Distribution: 
  known 
  only 
  from 
  type 
  locality 
  and 
  La 
  Juanita, 
  

   near 
  Las 
  Marias, 
  Porto 
  Rico, 
  

  

  New 
  York 
  Botanical 
  Garden. 
  

  

  