CONTRIBUTIONS TO THE FLORA OF IOWA. 75 



State is that recorded by Miss Mary E. Wood (Bot. Gaz., VII., 73), 

 who reports it from the Maquoketa River, about fifty miles west of Du- 

 buque, but I have seen no specimens. 



Phegopteris calcarea, Fee (No. 998), is "closely related to P. Dryop- 

 teris, the principal differences being a somewhat thicker root-stalk, 

 glandular stalk and fronds, fronds more rigid and erect, and smaller 

 pinnte on the lower side of the primary divisions" (Eaton). It is not 

 uncommon in Europe, but the only localities known in North America 

 are a station on the St. Louis River, in Minnesota, and a spot of a few 

 yards square at Decorah. The Decorah specimens are specially fine 

 and well developed. It is to be looked for on hmestone cliffs, particu- 

 larly those facing the north. Mr. Davenport, in his Supplement to the 

 Catalogue of the Dav. Herbarium ('March. 1883), writes the name P. 

 Dryopteris, Fee, var. RobertlaJiwii (Rupr.), and gives the history of the 

 synonymy, maintaining that it is not entitled to specific rank. 



Aspidiiim spi/iulosiiiii, Swartz (No. 1002), in the comparative size of 

 the pinnules and the markings of the spores in the Iowa specimens, 

 apjiroaches var. dilatatmn, which variety will doubtless be found event- 

 ually within the limits of the State. 



Cystopteris bulbifera, Bernh. (No. 1003), shows an interesting varia- 

 tion in a specimen received from Muscatine county. The under sur- 

 face of the frond is unevenly glandular, and the usually smooth bulb- 

 lets are clothed with dark brown lanceolate scales (palet^;), half as long 

 as the length of the bulbiets, each scale tipped with a colorless, globu- 

 lar, usually stalked gland, and with or without i to 3 similar glands on 

 either side, near the base. 



Spirit Lake, Iowa, Dcccmhcr, iSS:;. 



