Proceedings of the Ohio State Academy of Science. 295 



6. Lycopodium complanatum L. Trailing Club-moss. 



Stems creeping extensively, with erect or ascending, fan- 

 shaped, evergreen branches ; leaves minute, appressed, four- 

 ranked, the lateral rows with somewhat spreading tips ; peduncle 

 slender, dichotomous, with two to four cones. In woods. Cuya- 

 hoga, Carroll, Geauga, Licking, Fairfield, Hocking, and Lake 

 counties. (Erie county, Moseley Herb; Wayne county, Hopkins.) 



SUBKINGDOM, PTERIDOPHYTA HETEROSPORAE. 

 Heterosporous Pteridophytes. 700 living species. 



Plants in which the sporophyte in the living species is her- 

 baceous and after a brief embryonic stage has an independent 

 existence with true fibro-vascular tissue, roots, and leaves ; hete- 

 rosporous, with microspores and megaspores which give rise to 

 greatly reduced male and female gametophytes respectively ; 

 eusporangiate or leptosporangiate. Gametophytes always uni- 

 sexual, with little or no chlorophyll, living on food stored in the 

 spore and developing entirely inside of the spore wall or pro- 

 truding only slightly through the side, the nonsexual spores often 

 germinating before being discharged. 



Class IV. Hydropterides. Water-ferns. About 75 living 

 species. 



Sporophyte with a horizontal rhizome or floating on the 

 surface of the water ; leaves alternate or whorled ; microspor- 

 angia and megasporangia borne together enclosed in sporocarps, 

 leptosporangiate. Gametophytes developing entirely within the 

 spore walls or protruding only slightly, very short lived ; sper- 

 matozoids large, spirally coiled, multiciliate. 



I. Floating plants with minute leaves spreading into two ranks 

 and with rootlets on the under side . Azolla (Salviniales.) 



I. Leaves four-foliate with slender petioles 



Marsilea (Marsileales.) 



