MARYLAND WEATHER SERVICE 389 



Asplenium bradleyi D. C. Eaton. 



Baltimore County, Alberton; on exposed rocks (Robert K. Miller). 



Asplenium acrostichoides Sw. 



Midland and Mountain Zones; moist forests; frequent. 

 Allegany County, Braddock Run (889). 



Asplenium filix-foemina (L.) Bernh. Lady Pern. 



Throughout the state; in moist forests and thickets; common. 

 Worcester County, Boxiron (1056); Garrett County, Swanton (558). 



Adiantum pedatum L. Maiden-hair Fern. 



Rare in the Coastal Zone, common in the Midland and Mountain Zones; 



in moist forests. 

 Washington County, Weverton (1775). 



Pteris aquilina L. Bracken Fern. 



Throughout the state; in dry forests and open situations; preferring 

 light soils; common. 



Pellaea atropurpurea (L.) Link. Cliff-brake. 



Midland and Mountain Zones; on shaded and exposed rocks, — both lime- 

 stone and shale, — and on steep slopes with thin soil; frequent. 

 Washington County, Round Top (720). 



Cheilanthes lanosa (Michx.) Watt. Hairy Lip-fern. 



Midland and Mountain Zones; on exposed rocks, infrequent. 

 Frederick County, Sugar Loaf (1761). 



Polypodium vulgare L. Polypody. 



Rare in the Coastal Zone, common in the Midland and Mountain Zones; 



most abundant on rocks and rocky slopes. 

 Caroline County, Watts Creek (1661). 



Polypodium polypodioides (L.) A. S. Hitchk. Gray Polypody. 



Montgomery County, near Great Falls on shaded rocks (1741). 



MARSILIACEAE. 



Marsilea quadrifolia L. 



Anne Arundel County, Glenburnie; introduced at Saw Mill Pond. 



EQUISETACEAE. 



Equisetum arvense L. Field Horse-tail. 



Throughout the state; in moist forests and moist open situations; 

 common. 



Equisetum sylvaticum L. 



Baltimore County, flood plains of the Gunpowder River below Loch 

 Raven (Robert K. Miller). 



