March, 1S05.] Lycopodium porophilum in Ohio. 301 



B. Archegoniata. Archegoniatcs. 15,000 known living species. 



The intermediate plants; normally aerial plants but moisture-loving; 

 always with an alternation of generations, the gametophyte compara- 

 tively large and often hermaphrodite in the lower forms but minute and 

 always unisexual in the highest; the sporophyte small and without vas- 

 cular tissue and permanently parasitic in the lower forms but large and 

 witli vascular tissue and becoming independent when mature in the 

 higher; either homosporous or hetei-osporous, eusporangiate or leptospo- 

 rangiate, never seed-producing; growing point commonly with a definite, 

 two- or three-sided apical cell; stems sometimes having secondary thick- 

 ening bv means of a more or less perfect cambium or by division in the 

 cortical' cells; oosphere produced in an ovary of definite character called 

 an archegonium and always cutting off a ventral canal cell; fertilization 

 asiphonogamic, the spermatozoids swimming through water. 



C. Spermatophyta. Seed Plants. 125,000 known living species. 



The highest plants; normally dry land plants; always with an alter- 

 nation of generations; sporophyte large, heterosporous and eusporangiate, 

 the spores not discharged; the gametophytes usually minute, developing 

 in the sporangia and thus parasitic on the sporophyte; female gameto- 

 phyte, with an archegonium which develops an oosphere and ventral 

 canal cell or with only a rudimentary ovary, retained permanenth^ in the 

 megasporangium (ovule) ; male gametophytes (pollengrains) at length 

 discharged from the microsporangivmi (pollensac) but having a second 

 period of parasitic growth by the formation of a pollentube, hence fertili- 

 zation always siphonogamic ; male cells usually nonciliated but in the 

 lowest classes developing into multiciliate, motile spermatozoids; plants 

 producing seeds, the sporophyte embryo passing into a resting stage inter- 

 vening between its intra- and extra-seminal development; stems without 

 true apical cells, but more commonly with a cambium zone from which 

 secondary thickening takes place. 



LYCOPODIUM POROPHILUM IN OHIO. 



John H, Schaffxer. 



The Rock Lycopod, Lycopodium porophiluui Lloyd and 

 Underw., is a plant holding an intermediate position between L. 

 selago L. and L. lucidulum Mx. In examining some of my herba- 

 rium material recently I recognized a fine specimen of this species, 

 which Mr. O. E. Jennings had collected for me for class use over 

 a vear ago. The collection was made near Lancaster, Fairfield 

 Co. It probably has a considerable range in the state and should 

 be looked for wherever sandstone cliffs abound. It has a rather 

 stiff appearance and can be easily recognized form the descrip- 

 tion as given in Britton's Manual. The prostrate portion of the 

 stem is short and has abundant roots. After several dicho- 

 tomous branchings the vertical stems form a rather dense tuft 

 6 — 12 cm. high. The plant has abundant brood buds. The 

 leaves are nearly linear, acitminate, and nearly entire. They are 

 considerably smaller than those of L. hicidiiluiii and differ froi 

 L. selago in having the bases flattened. 



UJ L I B R A R Y 



