138 FLORA OF WASHINGTON AND VICINITY. 



t Pellaea atropurpurea, Link. Dark Purple Rock-Brake. Clayton's Cliff- 

 Brake. 

 Georgetown (Professor CMckering) ; Alexandria (Dr. Vasey) ; Great Falls. 



tPteris aquilina, L. Brake. Bracken. Eagle-Fern. 

 May, June. 



t Adiantum pedatum, L. American Maiden-hair. 

 Last of May. 



fWoodwardia angustifolia, Smith. Netted Chain-Fern. 

 August, September. 



■Woodwardia Virginica, Smith. Common Chain-Fern. Virginia Chain-Fern. 

 Terra Cotta Swamp. July, August. 



t Asplenium Trichomanes, L. English Maiden-hair. Dwarf Spleenwort. Maid 

 EN-HAIR Spleenwort. 

 Remarkable circumnutations of the fronds of this plant were discovered in 1879 

 by Professor E. J. Loomis, of Washington. 



t Asplenium ebeneum, Ait. Ebony Spleenwort. 

 Juue. 



t Asplenium angustifolium, Michx. Narrow-leaved Spleenwort. 



This plant was formerly found by Dr. Foreman and others on High Island, but 

 has not been seen there for many years. Mr, O. M. Bryan has, however, recently 

 found it at Marshall Hall, opposite Mount Vernon, and specimens of his collecting 

 there have been seen by Dr. Foreman, who vouches for their authenticity. Mr. 

 William Palmer has seen it growing abundantly at Seneca, Md., but this alone would 

 not entitle it to admission to this catalogue. 



t Asplenium thelypteroides, Michx. Silvery Spleenwort. 

 July. 



Asplenium Filix-foemina, Bemh. Lady-Fern. 



July. 



Camptosorus rhizophyllus, Link. Walking Fern. Walking Leaf. 

 Cabin John Run. Discovered by Dr. Frank Baker. 



Phegopteris hexagonoptera, Fee. Hexagon Beech-Fern. 

 Juue, July. 



Aspidium Noveboracense, Swartz. New York Shield-Fern. 



July. 

 Aspidium Thelypteris, Swartz. Marsh Shield-Fern. 



July, August. 



Aspidium cristatum, Swartz. Crested Shield-Fern. Crested Wood-Fern. 

 Carroll Estate. Sterile fronds only thus far found. 



Aspidium Goldianum, Hook. Goldie's Wood-Fern. 



Collected by Dr. Vasey and myself near the Conduit Road below Cabin John 

 Run, July 4, 1880. 



Aspidium Filiz-mas, Swartz. Male Fern. 

 Not common. September, October. 



