194 
OPHIOGLOSSACE2. 
Botrychium virginianum (L.) Swartz, Schrad. Journ. Bot. ii, 111 (1800); Osmunda 
virginiana L. Sp. Pl. ii, 1064 (1753), 
In woods, Plummer Ford, July 3; Forks of Dismal River, July 11 (No. 1467). 
FILICES. 
Onoclea sensibilis L. Sp. Pl. ii, 1062 (1753). 
Natick, June 20; Plummer Ford, August 23 (No. 1377). Common among bushes 
along the rivers. 
Dryopteris thelypteris (L.) Gray, Man, 630 (1848); Acrostichum thelypteris L. Sp. 
PI, ii, 1071 (1753). : 
Common throughout in meadows; Halsey, September 11; South Dismal, August 
12 to 14 (No. 1684). 
Dryopteris spinulosa (Retz.) Kuntze, Rev. Gen. Pl. ii, 810 (1891); Polypodium 
spinulosum Retz. Fl. Scand. ed. 2, 250 (1795). 
Rare, Plummer Ford, July 4 (No. 1484). 
Dryopteris cristata (I..) Gray, Man. 631 (1848); Polypodium cristatum Ll. Sp. Pl. ii, 
1090 (1753). 
In damp places among trees, on the bank of Dismal River; at the Forks, July 12; 
South Dismal River, August 14 (No. 1530). New to the State of Nebraska. 
Cystopteris fragilis (L.) Bernh. Schrad, Neues Journ. Bot. i, pt. 2, 27 (1806); 
Polypodium fragile L. Sp. Pl. ii, 1091 (1753). 
On the wooded banks of Dismal River, Plummer Ford, July 3 (No, 1452). 
Woodsia oregana Eaton, Can. Nat. ii, 90 (1865). 
On the wooded hillsides near Plummer Ford, July 5 (No. 1479). 
EQUISETACE A}. 
Equisetum arvense L. Sp. Pl. ii, 1061 (1753). 
Only the sterile fronds, collected at Natick, June 20; Thedford, September 9.(No. 
1378), 
Equisetum variegatum Schleich. Cat. Pl. Helvet. 27 (1807). 
On the banks of Middle Loup River north of Mullen, July 17 (No. 1801). 
Equisetum levigatum A. Br.; Engelm. Amer, Journ. Sci. xl vi, 87 (1844), 
Two forms of this are found in Nebraska. The more common one corresponds to 
the description given in the manuals, except that it is often branching at the base, 
like the preceding. The spikes are narrow and often somewhat stalked. Thedford, 
June 14 (No, 1260). The other form nearly equals EH. robustum in size,6 to 10 dm. 
high; ridges with 2 lines of tubercles, sheath 8 to 12 mm. long widening upward, 
with a black margin and sometimes with a slightly brownish shade at the base. In 
meadows, Thedford, June 14 (No. 1283). This is said to be a good “hay grass.” 
Equisetum robustum A. Br.: Engelm. Amer. Journ, Sci. xlvi, 88 (1844). 
On a hillside near Plummer Ford, August 24 (No. 1722). 
