58 



POLYPODIACEA 



Polypodium 



TO 



Map 42 



Azolla carolmiana Wflld. 



50 



Map 43 



Equisetum arvense L. 



sandstone and knobstone occur. There are, however, a few reports for it 

 outside of this area. For example, Phinney reported it from the area 

 composed of Delaware, Jay, Randolph, and Wayne Counties, saying: 

 "Common. Moist woods". Van Gorder reported it from Noble County, say- 

 ing : "A common plant of moist woods". Neither of these authors report the 

 Christmas fern which occurs in their area, and, without doubt, their 

 reports for this Polypodium should be referred to Polystichum. Bradner 

 reported Polypodium from Steuben County but he also reported Poly- 

 stichum. In this instance I think he may have had a sterile specimen of 

 Polystichum and thought it was a Polypodium. This species was reported 

 from the vicinity of Lake Michigan by three authors. I have always 

 questioned these reports because my idea of the habitat of this species is 

 that of outcrops of sandstone rocks. Doubtless Buhl had the same idea 

 when he said (Amer. Midland Nat. 16: 250. 1935) that this report should 

 be deleted for lack of confirming specimens. To my great satisfaction 

 (because I always prefer to confirm rather than to deny a report) on May 

 30, 1935 through the courtesy of R. M. Tryon, Jr. I was shown a colony 

 of this species on a wooded dune in the Dunes State Park. Mr. Tryon has 

 had this colony under observation for several years and reports that it is 

 gradually diminishing. The plant is growing in dense shade on the north 

 side of a high dune which is well protected from the wind. Doubtless this 

 species was infrequent to frequent in the dunes before it had to compete 

 with fire and civilization. 



Lab., Newf. to Man., southw. to Ga., Ala., and Mo. 



2. Polypodium polypodioides (L.) Watt var. Michauxianum Weath. 

 (Contrib. Gray Herb. 124: 31. 1939.) (Polypodium polypodioides (L.) Watt 

 of recent authors.) Resurrection Fern. Map 41. Very local in a few coun- 

 ties in the southern part of the state. It is usually found in large mats, 

 clinging to almost perpendicular cliffs or on large detached fragments of 

 rock below the cliff. I found it once in Posey County in the crotch of a 

 large bur oak tree which grew on the border of one of the numerous sloughs 

 in the bottoms. It grew at a height of about 10 feet above the ground but 



