54 



POLYPODIACEAE 



Asplenium 



50 



Map 29 



Asplenium pinnatifidum Nutt. 



50 



Map 30 



Asplenium platyneuron (L.) Oakes. 



the northern half of the state it is either absent or restricted again to the 

 soils of sandstone outcrops and to the sand areas about Lake Michigan 

 where it is only local. I have never seen it except in slightly acid soil, and 

 when transplanted into an alkaline environment, even with great care and 

 in a half bushel of the soil in which it grew, it gradually disappeared in 

 a few years. 



S. Maine to Ont., and Colo., southw. to the Gulf States and Tex. 



2a. Asplenium platyneuron f. serratum (E. S. Miller) Hoffm. This is a 

 form with some of the pinnae more or less deeply and irregularly serrate. 

 I think this is merely a nutritional form. A fine example of this form was 

 found in Perry County by R. M. Tryon, Jr. 



3. X Asplenosorus* ebenoides (Scott) Wherry. {Asplenium ebenoides 

 Pv. R. Scott.) Scott Spleenwort. Map 31. This fern is a hybrid between 

 Asplenium platyneuron and Camptosorns rhizophyllus . (Slosson. Bull. 

 Torrey Bot. Club. 29: 487-495. 1902.) Three colonies of this hybrid were 

 discovered in Lawrence County by Ralph M. Kriebel who fully described 

 them in Amer. Fern Jour. 23 : 52-59. 1933. Mr. Kriebel is one of the best 

 amateur botanists Indiana has ever had, and it is to his discriminating 

 collecting that we owe not only an authentic Indiana record of this hybrid 

 fern but also the records of three hybrid oaks and many other rare plants 

 of Lawrence County. 



Vt. to Mo. and southw. 



4. Asplenium Trichomanes L. Maidenhair Spleenwort. Map 32. 

 Infrequent to rare in pockets of soil on cliffs in the area of sandstone 

 outcrops of the state. 



Nearly throughout N. A. except in the extreme northern part and in 

 Mex. ; also in Eurasia. 



5. Asplenium cryptolepis Fern. (Rhodora 30: 41-43. 1928.) {Asplen- 

 ium Ruta-muraria of Gray, Man., ed. 7 and Britton and Brown, Illus. 



Amer. Fern Jour. 27: 56. 1937. 



