Proceedings of the Ohio State Academy of Science. 293 



or dicholomous ; leaves small, witliout a Hgule, scattered on the 

 siem, in two or many ranks; sporangia solitary on the upper sur- 

 face of the leaves or in their axils, eusporangiate ; sporophylls in 

 hands alternating with the sterile leaves or arranged in spirals 

 m terminal cones; spores small, not appendagcd. (iametophyte 

 small, sometimes subterranean, with or without chlorophyll, 

 herma])hr()dite ; spermatozoids biciliate. 



Order, Lycopodialcs. 

 Lycopodiaccac, Club-moss Family. 



21. Lycopodium L. Club-moss. 



1. Sporangia borne on leaves similar to the foliage leaves, not in ter- 

 minal cones. 2. 



1 . Sporangia or specialized, scale-like sporophylls which are arranged in 



terminal cones. .3. 



2. Stems dichotomously branched only at the base, the branches long; 



leaves nearly linear and entire, rather short and rigid, but not uni- 

 formly ascending L. purophiliiiii. 



2. Stems branched successively; leaves larger, widely spreading or re- 

 fle.xed, minutely toothed, and usually widest above the middle. 

 L. Iitcidiilnin. 



'■\. Leaves many-ranked on the cylindrical stem, not spreading into two 

 ranks. 4. 



'■]. Smaller branches flattened, or the leaves spreading into two ranks; 

 stems with erect or ascending tree-like branches. 5. 



4. Cones usually single, sporophylls much like the foliage leaves. 



L. inundatum. 



4. Cones usually in twos or long peduncles, sporophylls very unlike the 



foliage leaves L. clavatum. 



•'). Sterile stems with linear-lanceolate spreading leaves; cones erect, 

 closely sessile L. obscnrum. 



5. Sterile stems flattened, with fan-like ascending clusters of branches, 



leaves of two forms; cones clustered on long peduncles 



L. cdiiiplanatum. 



I. Lycopodium porophihiiii Lloyd & I'nd. Rock Club-moss. 



Stem dichotomously branched only near the base, the pros- 

 trate portion rooting freely : sporophylls in zones alternating 

 with the sterile leaves ; sterile leaves broadest at the base but 



