66 BOTANICAL GAZETTE 
easily arranged for when they are to be made at a distance from | 
source of material. Sometimes a single sowing of teleutospores deter 
mines the point in question, but for a variety of reasons it usuall 
does not. A common source of difficulty is the failure of the teleuto 
spores to germinate. But these are details pertaining to a § 
matter. It will be many years before any large proportion 
numerous heteroecious rusts will be connected with their res 
aecidia, and in the meantime all clues to relationship will be! 
prized by students, and their pursuit will give to the collect 
additional source of pleasure.—J. C. ArTHUR, Purdue University. 
ROCKY MOUNTAIN PLANT STUDIES. I. 
Havine spent the past two collecting seasons in the field with 
fessor Nelson, and having had the opportunity of much obséi 
and some investigation in the herbarium, I have become greatl 
ested in n the varied and beautiful flora of the middle West. No on 
a fae 
e. ‘this region are so ie remained unrecognized. The t 
deposited in the Rocky mountain herbarium of the 
‘Wyoming. : 
| Marsilia 
. Gisepns, & n. sp.—Plant 4-7 high : eaten 
— becoming Eitan, eae long, 3-7™" wide: sporocarp 
_ Somewhat woolly) pubescence: raphe short: 
Sane Soper a mere rounded papilla or wanting: pedt 
long: sori 5-8 in each valve: megaspores oval to barely obl 
in each sorus. 
a ‘This isa species ‘ehich has passed for M. vestita, but seeming! 
. very close relationship to it. The absence of the sharp upper tooth 
rocarp, which i is so > prominent in M9. vestita, is a mark eee 
