\ 



5G2 Llovd: Two Species of Lycopodium 



catcci on this side of the Atlantic, for a careful search over an 

 acre of ground in which a lart^e number of colonics of both 

 species were growing together, often intermixing, failed to dis- 

 cover anything at all to support this view. The two plants, 

 growing on the same S])ot with their rhizomes crossing, were com- 

 pletely distinct. It would be of value if the botanists of this coun- 

 try to whom the opi)ortunity ma>' come, would make observations 

 bearing on this matter. It may be added that certain European 

 botanists appear to entertain no doubt as to the specific distinction 

 of the two plants. 



The attempt was made by the writer to find what differences, 

 if any, existed between the spores, but without any very positive 

 results. The spores of luiropean specimens as well as from 

 the United States were examined, and as much variation appears 

 to exist between individual spores of L. couiplanatuvi, as between 

 the spores of L. davatiiiit and either of these here under 

 sideration. On the whole, however, there is a larger unreticulated 

 area on the inside facets of the spores of L. cliamaccyparissns, while 

 the angles of the reticulations appear to be thickened in L. com- 



con 



//, 



these criteria 



with unfailing certainty, so that I hesitate to assert that any value 

 should be attached to them. There arc slight differences, also, in 



the shape of the sporophylls, which in 



usually more abruptly contracted beneath the apex than In /.. 



w 



Aar/ssus are 



/// 



LvcorODIUM CHAMAECVF'ARISSUS A. Br, 



Rhizomes extensively creeping 2-4 cm. below the surface 

 of the ground, occasionally forced by obstructions to grow up- 

 ward, but turning down again when the obstruction is passed, In 

 color white, terete, sparingly branched in the horizontal plane, 

 their whorlcd or loosely spirally arranged leaves lanceolate or 

 ovate to broadly ovate (1-2 mm. broad), usually the latter, and then 

 scarious, abruptly contracted into a narrow base, acute, their mar- 

 gms membranous and erose ; the primary aerial shoots weak, terete, 

 usually siimously bent and often becoming decumbent under the 

 weight of the superadded foliage, the axis repeatedly forking until it 

 forms a mass of more or less vertically placed somewhat flattened 

 branchlets which a.re plano-convex in transverse section, T.5-2 mm. 

 broad (concave beneath on drying); the terminal branchlets recru- 



