Feb., 1910.] List of Ferns of Mahoning County. 87 



fern in the state. Originally but one block, the operation of man, 

 first in building the now abandoned grist mill and more recently 

 the high bridge across Mill Creek Gorge, has cut it up into three 

 approximate stations containing in all a little over two hundred 

 plants. The stream flows about east and west at this point and 

 the ferns all grow on the north side. Forked fronds and those 

 with pinnules elongated beyond the middle were found. 



Asplenium trichomanes L. Maiden-hair Spleenwort. Found 

 principally along ledges in Mill Creek Park, although it grows in 

 similar locations along the Mahoning River. 



Asplenium platyneuron (L.) Mill Creek Park, along the 

 Mahoning and in wooded and rockv slopes. 



Asplenium montanum Willd. Mountain Spleenwort. So far 

 but one station and that quite restricted for this somewhat rare 

 Ohio fern: "Standing Rock" in the Mahoning River in Berlin 

 township. This curious boat-shaped sand-stone rock has been 

 eroded free from a jutting "bogi back" through the united action 

 of the river and a tributary, and stands a picturesque mass 15 

 to 20 ft. high, 82 ft. long, 27 wide at base and 7 to 12 ft. wide at 

 top. And in the crannies of its fractured sides from 150 to 175 

 plants cling in flourishing condition. 



Thus far diligent search has failed to extend the distribution 

 either in the neighborhood of this rock or elsewhere in the countv. 



Asplenium angustifolium Mx. Narrow-leaved Spleenwort. 

 So far its title to a place in this list rests on a single sterile plant 

 growing in low moist woods in Ellsworth Township. During 

 several years of watching it has failed to put forth a fertile frond. 



Asplenium acrostichoides Sw. Silvery Spleenwort. Rather 

 common in its distribution over the comity. 



Asplenium filix-foemina. Lady Fern. As common in distribu- 

 tion as in variation. 



Camptosorus rhizophyllus (L.) Walking Fern. Abundant 

 on rocky walls of Mill Creek Park. Grows in similar situations 

 along the Mahoning. 



Polystichum acrostichoides (Mx.) Christmas Fern. Found 

 everywhere in the county. 



Aspidium thelypteris (L.) Marsh Fern. One of the com- 

 monest ferns, found in marshy places, wet pastures, woods, etc. 



Aspidium noveboracense (L.) New York Fern. As delicate 

 in design as in its exquisite shade of green. In damp woods, wet 

 pastures, shaded ravines or on wooded banks, in which two 

 latter places it attains highest perfection. Often found growing 

 with the last mentioned and is abundant in the county. 



Aspidium cristatum L. Crested Fern. Of general distribu- 

 tion though it does not form dense clumps or banks like some 

 other ferns and so does not appear so abundant. 



