22 Holm — Additions to the Flora of Washington. 



*\ii-ja. Onoclea Struthiopteris (L.) Hoffm. 



Frequent alonsj the alluvial portions of the Potomac on the Virginia 

 side one to two miles above Cabin Johns. Several collectors. 

 1242. Osmunda Claytoniana L. 



Between West Chevj' Chase and Glen Echo Junction. Wm. R. 

 Maxon. 

 1245. Botrychium ternatum Swiz. var. dissecfum Milde. 



Woods near (ireat P^alls. Md. 



1247. Ophioglossum vulgatum L. 



Grassy roadside bank, Upper Marlboro, Md. Wm. R. Maxon. Woods 

 at Marshall Hall: at the foot of Fort Totten. 



1248. Lycopodium lucidulum Michx. 



In dry woods near Cleveland Park. Wm. R. Maxon and C. L. Pol 

 lard. Ravines near Marshall Hall. 



1249. Lycopodium dendroideum Michx. 

 Woods near Surattsville. 



1253. Selaginella apus Spring. 



Has been ft)und in many places between Marshall Hall and Great 

 Falls, Md., and is evidently not uncommon. 



