22 Holm Additions to the Flora of Washington. 



Onoclea Struthiopteris (L.) Hoffm. 



Frequent along the alluvial portions of the Potomac on the Virginia 

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

 1242. Osmunda Clay toniana L. 



Between West Chevy Chase and Glen Echo Junction. Wm. R. 

 Maxon. 

 1245. Botrychium ternatum Swtz. var. dissectum Milde. 



Woods near Great Falls, 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 found in many places between Marshall Hall and Great 

 Falls, Md., and is evidently not uncommon. 



