Onoclea 



POLYPODIACEAE 



45 



6 ~3o 

 Map 12a 

 Pteretis nodulosa 

 f pubescens (Terry) Fern. 



~76 



Map 13 



Onoclea sensibilis L 



state although it may have been overlooked because of its close resem- 

 blance to Osmunda, cinnamomea. My specimens are mostly from alluvial 

 flood plains of small streams. 



Newf. to B. C, southw. to Va. and Iowa. 



la. Pteretis nodulosa f. pubescens (Terry) Fern. (Rhodora 37: 219. 

 1935.) Map 12a. This form is not well marked in Indiana. 



4. ONOCLfiA L. 



1. Onoclea sensibilis L. Sensitive Fern. Map 13. Frequent through- 

 out the state in low places in woodland, about lakes, and along roadsides. 



Forma obtusilobata (Schkuhr) Gilbert is a form with fronds inter- 

 mediate between the normal fertile and normal sterile phases, bipinnate 

 or nearly so, the pinnules flat and nearly free-veined, rarely partly fertile. 

 This form has been found in Porter County by R. M. Tryon, Jr., who says 

 it is not infrequent in meadows that have been mowed in the early part of 

 the year. There is a specimen from Porter County in the herbarium of 

 the University of Notre Dame. 



A form with the frond fertile, or somewhat so, on one side and sterile on 

 the other is forma hemiphyllddes (Kiss & Kummerle) Weatherby (Amer. 

 Fern Jour. 26 : 16. 1936) . This form was found on the right of way of the 

 Chicago, South Shore, and South Bend Railroad near Tremont, Porter 

 County. The right of way was mowed earlier in the year. 



Newf. to Sask., southw. to Fla. and Okla. 



5. DRYOPTERIS Adans. 



Indusia lacking; blades of fronds triangular or ternate. 



Blades ternate with the divisions nearly equal and petiolate, glabrous; rachis wing- 

 less. (See excluded species no. 2, p. 1019.) D. Linnaeana. 



Blades bipinnatifid ; pinnae sessile and more or less decurrent on the rachis. 



Fronds as wide as or wider than long, usually light green, finely puberulent or 

 glandular beneath; veins of the pinnules on the lowest pair of pinnae several 

 times forked 1. D. hexagonoptera. 



