Proceedings of the Ohio State Academy of Science. 293- 



or dichotomous ; leaves small, without a Hg'ule, scattered on the 

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

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

 bands alternating with the sterile leaves or arranged in spirals 

 in terminal cones ; spores small, not appendaged. Gametophyte 

 small, sometimes subterranean, with or without chlorophyll,, 

 hermaphrodite ; spermatozoids biciliate. 



Order, Lycopodiales. 

 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. porophilum. 



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



flexed, minutely toothed, and usually widest above the middle. 

 L. luciduluin. 



3. Leaves many-ranked on the cylindrical stem, not spreading into two 



ranks. 4. 



3. 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. 



5. Sterile stems with linear-lanceolate spreading leaves; cones erect, 



closely sessile L. obscurum. 



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



leaves of two forms ; cones clustered on long peduncles 



L. complanatum. 



I. Lycopodium porophilum Lloyd & Und. 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 



