Plants 3*6 dm. high ; sterile leaves long&talked, tri- 
angular- ovate, 2-pinnatifid below; pinnae 15 cm. or less 
L, 4 cm. or less wide, pinnatifid or sinuately lobed, de- 
current on the rachilla above ; fertile leaves much reduc - 
ed, longstalked, 4 cm. or less high. 
Frequent in moist places. Summer. 
24. MARSJLIA L. 1737. 
This name was dedicated by Michelius [Nov. Gen. 
c;. 1729.] to Aloysius Marsiliiis ^ an Italian physicist , 
It was then applied to species which Linnaeus after'- 
wards Included In his genus Jurigernian nla. The 
i)resent genus Mai^sllla was known to the Pre- Llnne- 
an botaizlsts by the names Lentlcula^ Lens palustrls 
names zvhlch were also applied to our present Lem- 
na species. 
Plants with a slender, creeping rootstock. Leaves long- 
petioled. Sporocarps borne on short peduncles arising 
from the rootstock and more or less adnate to the petiole. 
1. M. quadrifolia L. PI. 2. 
Mars Ilia quadrifolia L. Sp. PI. 1099. I^cLton^ 
in Gray, Man. 701. Underzv. in 111. Fl. i: 33; 
Nat. Ferns 123; in Britt, Man, 20. Clute^ 
1905. Fern Allies 195. 
55 
