123 
Ehrb.—var. alternans, Breb.—St. punctulatum, Breb.—St. poly- 
morphum, Breb. —St. cyrtoceron, Breb. — St. paradoxum, 
Meyen.—St. gracile, Ralfs.—St. hirsutum, Breb.—<S¢. teliferum, 
Ralfs.-—St, Saxonicum, Buluh.—St. polytrichum, Perty.—St. 
spongiosum, Breb,.— St. controversum, Breb.—St. vestitum, 
Ralfs.—St. oxacanthum, Archer.—St. farcigerum, Breb.—<S¢. 
lunatum, Ralfs.—St. munitum, Wood. The following four are 
considered new species. | 
St. bibrachiatum, n. sp., segments subquadrangular, or cuneate, 
gradually widening upward, truncate at ends, lateral extremi- 
ties each tapering into a single, elongate divergent colorless 
process, rough or denticulate on the margins. Arms two to three 
times as long as the body. End view elliptical, with a single 
process at each end, tips obtuse dentate.—.00187’—.00225” long 
with arms, .0015”—.0016” wide. 
St. cuneatum, n. sp. Frond as long as wide. Segments 
broadly cuneate with convex bases, producing in front view deep 
constrictions between them. Sides converging from the base upward 
to a truncate end, each with three to six sharp teeth, spaces bet ween 
them deep inverted crenulations. End view triangular, sides some- 
what concave, angles bi-trifid, with six radiating central processes 
rarely extending beyond the sides. .00175’—00225” each way. 
St, binaculeatum, n. sp. Frond smooth, front view subellip- 
tical, inner margins more convex than the outer, angles with 
two spines separated at the base. End view triangular, sides 
slighty concave, angles bluntly rounded with two rather long 
more or less divergent spines on each. .0015” long, .002” wide. 
_ St. eruciatum, n. sp. Frond small, smooth, front view cruci- 
form, the arms mammillare, sinus wide, obtuse angled. End view 
three or four lobed, each slightly tapering, ends rounded with a 
number of more or less diverging setae, as long as the lobes, on the 
ends of each. .001” without setae. 
17. Xanthidium, Ehrb.—-X. fasciculatum, Ehrb.—ditto var. antelo- 
poum, Ktz.—ditto var. polygonum, Ehrb. 
18. Arthrodesmus, A. convergens, Ehrb. 
I shall be pleased to hear from any one interested in this subject, especially with a view 
to add to the knowledge of this kind of plants. rw 
§ 128. A Two Day’s Excursion.—The geology of Grayson 
County, Ky., at the station called Big Clifty, is peculiarly adapted 
to the growth of ferns. The sand stone which underlies the sur- 
face is quite soft and disintegrates readily. The country is very 
hilly, and the streams, which at times rise rapidly, have worn their 
beds into immense gullies. Big Clifty Creek bridge, 62 miles from 
Louisville, on the Paducah R. R., from cliff to cliff, is one hundred 
and thirty two feet high. The following is a list of ferns collected _ 
in a recent excursion by Major W. J. Davis and myself, within a 
circle of a radius not greater than two and one half miles. Aspid- 
ium acrostichoides, Swartz; A. spinulosum, Swartz; A. spin, var, 
intermedium; A. Noveboracense, Swartz; A. marginale; Swartz; 
Adiantum pedatum, L.; Botrychium Virginicum, Swartz; Camp- 
