BULLETIN 
TORREY BOTANICAL CLUB 
a OE 
Contributions to American Bryology—VI. 
By EvizaBeTu G. BRITTON. 
I. WESTERN SPECIES OF ORTHOTRICHUM. 
In a recent letter Dr. Venturi says that “there is great con- 
fusion in the genus Orthotrichum, due to the fact that’ American 
authors have described many new species, and that European 
authors have described others without taking into account what 
_ had already been done in America.” 
: Even a superficial survey of the field will convince us that this 
S only too true, but we think European bryologists are more 
“countable for this than American ones, for Sullivant at least, 
Who described most of our new species, figured and gave com- 
- plete characterizations of all which he proposed. 
Since 1887 there have been added 14 species and 8 varieties of 
this genus to the flora of our Western States; 9 of these are new, | 
_ 4nd 5 others are previously described European ones. There 
Were 5 new Species added by Mitten in 1865, which were but little 
nOwn and several not since collected, and in 1874 Sullivant fig- — : 
_ Ured and described 8 more, With the recent additions in Mes 
Botanisches Centralblatt, and Hedwigia, by Venturi; and Kind- _ 2 
_ ?erg’s and Miiller’s from Macoun’s Canadian mosses, with a few 
of Renauld and Cardot’s from Henderson’s Oregon collections, it ; A - 
— “Mngs the number up to 47, many of which have been collected 
hing once, and are still lacking in figures and parts of deserig bats 
= emed desirable, therefore, to call the atte 
