558 
and Campbellton, Florida, Chapman; on damp sand along the 
margins of pine barren ponds, Levy Co., 1877, and near Rose- 
wood, Florida, A. P. Garber, November, 1877; Ocean Springs, 
Mississippi, S. M. Tracy; New Orleans, Louisiana, Drummond, 
1833. ; 
A minute species ranging through the Southern and Gulf 
‘States to Mexico and Cuba, also in Guiana and Brazil, though 
many of the larger specimens in the herbarium of D. C. Eaton 
and probably at Kew, are referable to other tropical American 
species. A specimen in the herbarium of Prof. Underwood, col- 
lected in “Moist places in the Sierra Madre Mountains, Chi- 
huahua, Mexico, by C. G. Pringle, Oct. 21-30, 1887,” is certainly 
not this species. It is much larger and the venation is quite differ- 
ent. It is probably undescribed. There has been much confu- 
sion as to the proper name for this species. O. uudicaule L. be- 
longs to an African species collected at the Cape of Good Hope 
by Thunberg, and Prantl enumerates five authors who have applied 
the name to seven different species, and concludes that our North 
American specimens should be known by a manuscript name 0. 
tenerum of Mettenius. Eaton and-other American authors have 
discarded O. pusilléum Nutt., because he describes the frond as cor- 
date. Some notes by J. H. Redfield in the Eaton Herbarium made 
from Nuttall’s types at the Philadelphia Academy of Sciences, 
prove, however, that his specimens of OQ. pusillum are what we 
have been calling O. nudicaule, and he says that it is “ scarcely 
ever more than an inch high.” Besides he enumerated Q. dud- 
bosum, of which O. pusillum has been considered a synonym, as 4 
distinct species. 
7. OPHIOGLOSSUM CROTALOPHOROIDES Walt. Fl. Carol. 256. 1788. 
O. bulbosum Michx. Fl. Bor. Am. 2: 276. 1803. : 
_ Plants 3-12 cm. high ; rootstock globose, large, often 1 cm. 
in diameter, bearing few slender roots, and several fronds; petioles 
subterranean, I~3 cm. high; sterile lamina 1~3 cm. long, .5-2 em. 
broad, concave or carinate, broadly ovate and cordate at base, 
apex acute; basal veins 5, midvein slightly stronger, rarely 
branched and continuous nearly to apex; lateral veins freely anas- 
tomosing, forming short hexagonal areolae with no or rarely one 
free veinlet ; peduncle slender, 1-9 cm. long, arising from the 
petiole; spike short, broad, 3-10 mm, long, apiculate ; sporangia : 
4-II pairs; spores .05 mm. diam., reticulate with raised ridges. 
