36 BOTANICAL GAZETTE [JANUARY 
spores of other species, but a constant character in the matured 
spores of 7. Eatont. The macrospores are quite small, the com- 
missural ridges usually cristate, and the epidermis of the spo- 
rangia,in /. Engelmanni unspotted, is in this species often covered 
with light brown sclerenchyma cells. 
Although I have visited three times the locality in East 
Kingston where this species occurs, I am yet indebted for many 
of the foregoing facts to the discerning eye and untiring efforts 
of Mr. Eaton himself, who has taken much interest in the incon- 
spicuous but interesting plants of this family. 
Isoetes Eatoni, n. sp.—Trunk stout, 6-48™" in diameter, 
bilobed, diameter of bulb sometimes 66": vernal and immersed 
leaves 50 to nearly 200, 38—71°™ long, with an elevated ridge on 
the ventral side, strongly winged near the base, the wing decur- 
rent into a broad (3™") hyaline margin, which is furnished with 
slender irregular hooked teeth, median section nearly triangular 
‘in outline; zstival leaves much shorter, 7.5~15°™ long, the outer 
nearly decumbent, median section approaching quadrangular ; 
stomata abundant: peripheral bast bundles of irregular occur- 
rence, often weak or wanting: sporangia maturing only when 
emersed, large, oblong, strongly arcuate, in well grown plants 
10™™ long and 4™™ wide, nearly covered with very light brown 
sclerenchyma cells: velum about one-fourth indusiate: macro- 
spores —. ae equatorial diameter 300—4 50M, 
sculpture lak Dy onvolute | ridges cristate : 
25-30 in length, smooth or slightly papillose: plant 
pulygamous : 
fag Mr. Alvah A. Eaton on the fats," ‘Powwow Station, East . 
ie a 2 ot been found on the tidal tract _ 
< of the Mesiichan river ae ‘Newburyport, Mass., and a large number at Pau- 
‘ Lsuseighee river, Epping, N. H., oneof the latter being trilobed. a 
n ‘interesting problem relating to the quillworts is isas to the . 
s ‘chemical nature of the clear white covering of th 
