113 
are usually developed from the cells of the basal leaf-node external 
to the verticil, though a few are seen within the whorl, The sporan- 
gia at the fundus of the verticil are comparatively few in this species. 
This plant was gathered in company with T. intertexta^ Allen, in 
Seneca Lake, N. Y., near Geneva, at a depth of about ten feet of 
water, in August, 1882. 
Tolypella prolifera^^ Leonh. — Plant large, clothed with broad 
and elongated green leaves, rarely incrusted. Sterile leaves simple, 
three to four-celled, elongated, acute. Fertile leaves with two (rarely 
three) fertile nodes and a three- to four-celled terminal, acute; rays 
of the leaf two to three at each node, 3-4-celled, mostly simple (fer- 
tile nodes have rarely been seen on the rays of the leaf In American 
plants), acute. The mucronate tip of the leaves and rays is some- 
what elongated, never short and abrupt, from 100 to 120/^ long, and 
45"~5o/^ broad at base; the leaf just below this tip is about 100// in 
diameter. Sporangia numerous in the fundus of the verticil and on 
the ventral aspect of the leaf-nodes; coronula persistent, superior 
cells longer than the inferior; nucleus chestnut-colored, round-oval, 
345-375/^ (the largest fully mature) long, 300/i broad; striae ?>-(), 
mconspicuous. Antheridia short-stipitate^ 3ooyU in diameter. 
I am fortunate in possessing some of E. Hall's original specimens, 
determined by the late Prof. Braun, and have been able to compare 
other plants with this. Braun, in Nordstedt's '' Fragmente," gives 
as locahties: from Engelmann's herbarium, "Upper Missouri, Pinois 
Springs, Hayden's survey, Forma munda cinerascens^ 1858," and 
^^ Athens, Illinois, E. Hall." It has been sent to me by Prof. Macoun, 
Flora of the great Plains, railway survey, Canada, near Bottsford, 
Aug. 6th, 1879 •" I have also received very young plants, having 
numerous, long, sterile leaves from the base, overtopping the whole 
plant, from Mn Horsford of Vergennes, Vt., though there is some 
doubt as to their determination. 
Doubtless the species will be found to be not uncommon in the 
northern portions of the country and in Canada. 
Tqlypella fimbriata, nov. sp. — Statura -mediocris, 0.15- 
0.2O™- alt., viridis. Folia verticillorum sterilium indiyisa rarissinie 
divisa, 2-3-articulata, acuta. Folia fertilia duplicato divisa, radiis 
fertilis 3-4-cellularibus. Sporangia in divisura foliorum et in fundo 
verticilli aggregata, coronula persistente, cellulis superiorbus longiori- 
busquam inferioribus ; nucleo fusco, ovali, 425-450/^ long, 330-350/* 
lat., oxygyro ; striis 9-10, prominulis, acutis ; antheridio stipitato, 
3^0'335/* diametro. 
From T,prolifera, to which this species is most nearly allied, it 
differs in its smaller size, larger fruit, oval nuclei, with more numer- 
ous and prominent sharp angles. 
The plant has a long, simple stem, naked (with perhaps one 
small verticil near the base) nearly to the compact head of fertile 
leaves. Just below this is usually the sterile verticil of 7-9 leaves, 
^•05-0.08'"- long, which extend far beyond the fertile head, formmg a 
coarse fringe or involucre of leaves. Very rarely, the sterile leaves 
Hl^ivided,^! have seen but one specimen divided: 
Description taken from American specimens- No satisfactory description of 
^^ species has as yet Leen given. 
