L YCOPODIA CE&. 1 39 



Beauv.) North Carolina to Canada and westward to Washing- 

 ton and Unalaska. 



ft Leav:z of two forms, few ranked; stems flattened. 

 <~ ii. L. Carolinianum L. Sterile stems and their few short 

 branches entirely creeping; lateral leaves broadly lanceolate, 

 acute, and somewhat oblique, one-nerved, widely spreading in 

 2-ranks ; upper row of leaves shorter, appressed ; peduncle 

 simple, slender, 2' 4' high, clothed with small bract-like leaves, 

 bearing a single cylindric spike. {L. repens Swz., L. affine Bory., 

 Lepidolis repens Beauv.) New Jersey to Florida, Alabama, and 

 Louisiana. 



_ 12. L. complanatum L. Stems extensively creeping, 

 with erect or ascending fan-like branches several times forked 

 above; branchlets crowded, flattened; leaves minute, imbri- 

 cate-ap pressed, 4-ranked; the lateral rows with somewhat 

 spreading tips; the intermediate smaller, narrower, and wholly 

 appressed ; peduncle slender, bearing 2 4 cylindric spikes. 

 (L. thyoides Humb. & Bon pi., L. tristachyon Pursh, L. anceps 

 Wallr., L.chauicEcypartssus A. Br. , Lepidotis lomplanata Beauv.) 

 North Carolina to New England, Michigan, and northward. 



II. PSILOTUM R. Br. 



Perennial plants, terrestrial or growing on trees. Stems di- 

 chotomously-branched with minute alternate leaves or appar- 

 ently leafless. Sporangia sessile, 3-celled, opening at the apex 

 into 2 3 valves. Spores farinaceous, oval or elongate-reniform, 

 Name from Gr. if>iX.oS, naked, alluding to the abortive leaves. 

 Contains four species, mostly tropical. 



^ i. P. nudum (L.) Griseb. Stems erect, 8' 10' high, trique- 

 trous at base, many times forked at apex; ultimate divisions tri- 

 quetrous-winged ; leaves remote, awl-shaped, less than i" long; 

 sporangia in spikes. (P. Floridanum Michx., P. triquetrum 

 Swz., BernJiardia dichotoma Willd., B. pedunculata Desv., Ly- 

 copodiuni nudum L.) South Florida; Bluffton, South Carolina 

 (Mellichamp). 



