Z YCO PODIA CE^. 1 39 



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

 ton and Unalaska. 



W Leav:i of two forms, few ranked; stems flattened. 



11. 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. (Z. repens Swz., L. ajffine Bory., 

 Lepidoiis 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-appressed, 4-ranked; the lateral rows with somewhat 

 spreading tips; the intermediate smaller, narrower, and wholly 

 appressed : peduncle slender, bearing 2 — 4 cylindric spikes. 

 (Z. thyoides Humb. & Bonpl., Z. tristachyon Pursh, Z. anceps 

 Wallr., L.chainacyparissHs A. Br. , Lepidotis coiiiplanata Beauv.) 

 North Carolina to New England, Michigan, and northward. 



II. PSILOTUM R. Br. 



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

 cliotomously-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. tpiXo?, naked, alluding to the abortive leaves. 

 Contains four species, mostly tropical. 



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

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

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

 sporangia in spikes. {P. Floridanmn Michx., P. triquetrum 

 Swz., Berfihardia dichototna Willd., B. pediaicidata Desv., Ly- 

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

 {Mellzchatnp). 



