ERRATA. 
Page 6, Ist line, for “‘ Wusiacese” read ‘* Weissiacew.’” 
«6, 9th line, from top for ‘ Weisia” read ‘“‘ Weissia.” 
Be east wp « « «© © Breyerianum” read ‘«Brewerianum.” 
«15; 16th «« “© heterostychum ” read ‘‘ heterostichum.” 
“ 96, 9th — “4 @thyphylla” read “ ithyphylla.”’ 
** 32, 10th, 18th, 19th - «© « «Breyerianum” read ‘‘ Brewerianum.” — 
ot 3a bottom for ‘* Eurynchum ” read “«Burhynehum.”’ 
mee so, ; top ‘“ ‘‘commulatum” read “ commutatum. 
‘© 37, 10th ; “ ‘<“Rhitidium” read “ Rhytidiam.” — 
