50 



POLYPODIACEAE 



Polystichum 



"50 



Map 22 

 Polystichum acrostichoides 



(Michx.)Schott 



50 



Map 23 

 Dennstaedtia punctilobula 

 li'chx.) Moore 



students as a hybrid between Dryopteris cristata and Dryopteris spinulosa 

 var. intermedia. 



N. S. to Minn., southw. to Va. 



6. POLYSTICHUM Roth 



1. Polystichum acrostichoides (Michx.) Schott. Christmas Fern. Map 

 22. This is a woodland species preferring the lower part of the slopes of 

 deep wooded ravines. It is infrequent to rare in some of the northern 

 counties, becoming frequent to common in the southern half of the state, 

 especially among the hills. In protected places in the southern part of the 

 state it is evergreen. 



N. S. to Ont. and Wis. ; southw. to Ga. and Tex. 



la. Polystichum acrostichoides f. incisum (Gray) Gilbert. (Polystichum 

 acrostichoides var. Schiveinitzii (Beck) Small.) I have a specimen of this 

 form from Daviess County. It has, however, been reported from several 

 other counties throughout the state. 



lb. Polystichum acrostichoides f. crispum Clute. This is a form with 

 the margins of the pinnae crisped and ruffled. It has been found by R. M. 

 Tryon, Jr. in Porter County. 



7. DENNSTAfiDTIA Bernh. 



1. Dennstaedtia punctilobula (Michx.) Moore. (Dicksonia punctilobula 

 (Michx.) Gray.) Hay-scented Fern. Map 23. This fern seems to be 

 rare in the state. It prefers the sandstone and shaly rocks of deep, wooded 

 ravines. Williamson, in "Fems of Kentucky," says it was found along 

 Silver Creek north of Louisville, Kentucky. It was rather common in a 

 rocky ravine in Turkey Run State Park. Outside of Indiana in suitable 

 habitats it often becomes an annoying weed in pastures. 



N. S. to Minn., southw. to Ga. and Mo. 



