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 rocky 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 county. 
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 county. 
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 crista turn 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. 
