L YCOPODIA CEM. 1 3 1 



placed branches with dense foliage ; leaves more or less ap- 

 pressed, or at least upwardly directed, triangular (\^'- — 4") to 

 linear-acuminate (i" X 5') or aciculate, broadest at the hollow 

 base, gradually tapering to the acuminate apex, entire ; sporo- 

 phylls shorter than the leaves, triangular ; sporangia reniform ; 

 plant very frequently gemmiparous. Mountains of North 

 Carolina, northward and westward to Greenland, Idaho, Wash- 

 ington, and Alaska. 



\\ Leaves flattened at their bases and uttimately more or less 

 reflexed. 



2. L. porophilum Lloyd & Underw. Prostrate portion of 

 stems short, abundantly rooting, curving upwards, then dichot- 

 omously branching i — 3 times to form a rather dense tuft (2' — 

 4' high) of vertical stems, densely clothed with spreading or 

 reflexed leaves ; leaves (3" — 5" X i") very slightly broadened 

 above the middle and similarly contracted toward the base, 

 those between the strobilar regions shorter (3"— 4"). broadest 

 at the base, but very gradually tapering, entire or very minutely 

 denticulate ; sporangia compressed reniform ; sporophylls mi- 

 nutely denticulate above the middle or entire, acumii)ate ; plant 

 often gemmiparous. Sandstone rocks, Wisconsin, Indiana, 

 Kentucky, and Alabama. 



3. L. lucidulum Michx. Prostrate portion of stems longer 

 (2' — 60, frequently rooting, curving upward, and dichoto- 

 mously branching 1 — 3 times to form a loose cluster, 4' — 8' 

 high, of a few densely leafy vertical stems, or the stems occa- 

 sionally occur single ; leaves reflexed, 4" — 5" X i" or less wide, 

 linear-obovate, broadest above the middle, from which point 

 they gradually taper to the \" wide base ; margin erose 

 denticulate above the middle, acute ; sporophylls 2" — 4" long, 

 linear, acute, entire,, or sometimes slightly denticulate ; spo- 

 rangia depressed reniform ; plant often gemmiparous. South 

 Carolina to Newfoundland and Minnesota. 



* * Plants with more or less extended horizontal stems ; the 

 sporophylls aggregated into terminal strobiles, 



t Sporangia subglobose ; sporophylls similar to the foliar 

 leaves, 



\ Sporophylls short (2"— 3"). 



