STATE GEOLOGIST. 177 



A. Boottii , Tuckerman, (A. spinulosum, Swarlz, var. Boottii, Gray.) Boott's 

 Wood-Fern. 

 Kanabec county, Upftawi. Infrequent. 



A, cristatum, Swartz. Crested Wood-Fern. 



Throughout the state ; frequent northward, rare southward. St. Croix river, Parry; 

 Minneapolis. Simmons; Saint Paul and lake Harriet (near Minneapolis), Miss Cathcart; 

 Blue Earth county, Leiberg, [Extending northwest to lake Winnipeg, Eaton; Nebras- 

 ka, Aiighey.] 



A. Goldianum, Hook. Goldie's Wood- Fern. 



Minnesota, Daue7ipor(;Minneopa falls. Blue Earth county, Leiberg. Rare. East. 



A. Filix-mas, Swartz. Male-Fern. 



Northshoreof lake Superior, near Beaver Bay, Compbell. Rare. North. 



A. inarginale, Swartz. Marginal Shield-Fern. Evergreen Wood-Fern* 

 Lapham, Davenport. Infrequent. [Nebraska, Aughey.] 



A. acrostichoides, Swartz. Christmas-Fern. 



Lapham, Miss Cathcart. Fort Snelling, Parry. East. 



A. Lionchitis, Swartz. Holly-Fern. 



South of lake Superior, Whitney; doubtless also north of this lake in Minnesota. 

 [Nebraska, Aughey.] 



[A. aculeatum, Swartz, var. Braunii, Doell, will also probably be found in the north- 

 east part of this state.] 



CYSTOPTEKIS, Bernhardi. Bladdek-Fern. Cystopteris. 



C. biilbifera, Bemh. Bulblet Cystopteris. 

 Frequent, or common, throughout the state. 



C. fragilis, Bernh. Brittle Fern. 



Also frequent, or common, throughout the state. Very variable ; the form named 

 var. dentata. Hook., has been observed at Cascade river, north of lake Superior, Rob- 

 erts; Taylor's Falls, Miss Cathcart; and in Iowa (common), Arthur. 



C. iMontana, Bernh. Bladder-Fern. Cystopteris. 



In a swamp at the silver mine tliree miles up the bay from Port Arthur, Macoun; 

 probably also to be found north of lake Superior in Minnesota. [Deltoid-ovate, deli- 

 cately tripinnate, and almost quadripinnate fronds, and a long, slender, creeping root- 

 stock. Eaton in Wheeler's Report of Surveys luest of the One Hundredth Meridian.] 



ONOCLEA,L. Sensitive Fern. 



O. Strutliiopteris , Hoff. (Struthiopteris Germanica, Willd.) Ostrich- 

 J^ern. 

 Common, or frequent, throughout the state, excepting southwestward. 



O. sensibilis, L. Sensitive Fern. 



Common throughout the state, excepting perhaps near its west side. (A frond 

 eighteen inches high, sterile on one side of the stipe, but wholly fertile on the other 

 side, was found by the writer in Todd county The form called var. obtusilobata, 

 Torr., has been noted at Taylor's Falls, Miss Catlicart, and Mankato, Oedge.) 



WOODSIA, R. Br. Woodsia. 



W. obtusa, Torr. Obtyse Woodsia. 



Throughout the state, but local. Taylor's Falls [falls of the St. Croix], Parry, 

 12F 



