﻿Vol. 
  47 
  

  

  No. 
  9 
  

  

  BULLETIN 
  

  

  OF 
  THE 
  

  

  TORREY 
  BOTANICAL 
  CLUB 
  

  

  SEPTEMBER, 
  1920 
  

  

  Calymperaceae 
  of 
  North 
  America 
  

  

  R. 
  S. 
  Williams 
  

  

  (with 
  plates 
  15-17) 
  

  

  The 
  next 
  part 
  of 
  the 
  North 
  American 
  Flora 
  relating 
  to 
  mosses 
  

   will 
  cornprise 
  the 
  families 
  Fissidentaceae 
  and 
  Calymperaceae. 
  

   The 
  second 
  of 
  these 
  families 
  includes 
  only 
  two 
  genera, 
  Syrrhopodon 
  

   and 
  Calymperes. 
  The 
  results 
  obtained 
  from 
  the 
  study 
  of 
  this 
  

   group 
  are 
  here 
  offered 
  in 
  advance, 
  partly 
  to 
  allow 
  the 
  illustrations 
  

   of 
  cross-sections 
  of 
  the 
  leaves 
  to 
  be 
  issued 
  with 
  the 
  descriptions. 
  

  

  ■ 
  

  

  SYRRHOPODON 
  Schwaegr. 
  Suppl. 
  2^: 
  no. 
  1824 
  

  

  Dioicous 
  or 
  rarely 
  autolcous. 
  Growing 
  in 
  mostly 
  compact 
  

   cushions 
  of 
  pale 
  green 
  to 
  greenish 
  brown 
  color 
  with 
  more 
  or 
  less 
  

   radiculose, 
  branching 
  stems 
  from 
  a 
  few 
  millimeters 
  to 
  6-8 
  cm. 
  

   high. 
  Leaves 
  with 
  mostly 
  imbricate, 
  often 
  conspicuously 
  white 
  

   base, 
  mostly 
  narrowed 
  upward 
  to 
  a 
  point 
  varying 
  from 
  straight 
  

   to 
  crispate 
  and 
  from 
  lanceolate 
  to 
  lingulate 
  or 
  ligulate, 
  with 
  acute 
  

   or 
  rounded, 
  mostly 
  denticulate 
  apex 
  and 
  having 
  a 
  distinct 
  border 
  

   (except 
  in 
  5. 
  martinicensis) 
  either 
  much 
  thickened 
  or 
  of 
  hyaline 
  

   or 
  yellowish 
  cells. 
  Costa 
  stout, 
  from 
  nearly 
  percurrent 
  to 
  excur- 
  

   rent, 
  often 
  papillose 
  or 
  spiny 
  on 
  one 
  or 
  both 
  sides, 
  in 
  cross-section 
  

   showing 
  one 
  row 
  of 
  guide-cells 
  with 
  rarely 
  a 
  few 
  accessory 
  guide- 
  

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

   differentiated. 
  Leaf-cells 
  throughout 
  upper 
  part 
  of 
  leaf 
  chloro- 
  

   phyllose 
  and 
  roundish 
  or 
  oval 
  to 
  quadratic, 
  rarely 
  smooth, 
  mostly 
  

   papillose 
  or 
  mamillose 
  on 
  one 
  or 
  both 
  sides; 
  cells 
  of 
  the 
  erect 
  base 
  

   mostly 
  hyaline 
  (the 
  cancellinae), 
  square 
  to 
  linear, 
  changing 
  

   abruptly 
  into 
  the 
  green 
  cells 
  of 
  upper 
  part 
  of 
  leaf. 
  Perichaetial 
  

   leaves 
  usually 
  smaller 
  than 
  the 
  stem-leaves. 
  Seta 
  erect, 
  elongate 
  

  

  iThe 
  Bulletin 
  for 
  August 
  (47: 
  325-366. 
  pi 
  14) 
  was 
  issued 
  October 
  5, 
  1920.] 
  

  

  367 
  

  

  