37 
Plants from all these localities contain macrospores of normal 
size, that is, not larger than 560 g in diameter, as given by A. Braun 
the founder of the species, but it has remained for Mr. A. A. Eaton 
to extend the known range of this species into New Hampshire, 
and to there discover plants having much larger spores than those 
previously recorded; plants from Country pond, Kingston, N. H., 
having spores 5H0 n in diameter, from Pautuckway pond 700 // in 
diameter, and from Pautuekaway river, Epping, N. H. , 750 //, the 
spores of th-e latter being as large as any of I lacuatris, but sculp- 
tured like those of I. Tuckermani in a very characteristic manner. 
Dr. C. B Graves has also sent a large number of plants of this 
species from North Stonington, Conn. I. Tuckermani matures its 
spores earlier than any other of our species, the outer leaves often 
falling away early in July. 
V 
238 . !. saccharata Engelm Leaves 10-20, dark green, 
spreading, subulate, 2-5 inches long ; stomata abundant ; peripher- 
al bast-bundles wanting; sporangia spotted; velum narrow; ma- 
crospores 400-550 //, “as if sprinkled with minute grains of white 
sugar,” — Engelm. Microspores 24-38 g, papillose. Type locality 
on Wicomico and Nanticoke rivers, eastern shore of Maryland, 
above salt water, but between high and low tides. Scattered on 
a thin stratum of mud covering a bed of gravel, W. M. Canby, 
Piney Creek cove and Back Creek, Elk river, Mainland, T. C. Pal- 
mer, Botanical Gazette, Jan., 1895 Tidal tract of the Merrimac 
river near the mouth of the Artichoke, R. D. Plants like those 
from Elk river. 
At Lloyd's creek, Sassafras river, Md. , plants intermediate in 
spore sculpture between I. saccharata and I. riparia have been col- 
lected by Mr. Palmer; Botanical Gazette, Apr. 1896. 
V 
239 . I. riparia Engel. Leaves 15-30, dark green, nearly 
erect, 4-12 inches long ; stomata abundant ; peripheral bast-bun- 
dles wanting : sporangia distinctly spotted ; velum one-fourth to 
three-fourtlis indusiate ; macrospores often large, 450-650 g in di- 
