278 The Botanical Gazette. [July, 
R. lamellosa is known from Ontario, New Jersey, Alabama 
and ome: 
. arvensts from Connecticut, New Jersey, Ontario and 
Distaet of Columbia; R. crystallina from iltnois, South Car- 
olina, Colorado, and ‘Neva 
R. minima is known from New York, New Jersey, South 
Carolina, Illinois and California, R. senuzs from New Jersey, 
Delaware, Ohio, Missouri and Arkansas. 
R. Frostit is known from Ohio, Illinois, Missouri, Kansas, 
S: Dakota, Idaho, Montana, and Colorado: 
R. lutescens leads the list, being known from Massachu- 
setts, New York, Virginia, Tennessee, . Louisiana, Ontario, 
Ohio, Illinois, Minnesota and Idaho. 
From 21 states there are no Riccias reported and fourteen 
others have reported each a single species. 
The above showing would strongly point to the fact that 
there is need of much local observation before we can form 
any rational idea’either of the extent of the genus as devel- 
oped in America or of its geographic distribution. 
Greencastle, Indiana. 
el 
* Ricciocarpus natans and Ricciella — formerly included in this genus 
have a much more extended distribution 
