134 OHIO BIOLOGICAL SURVEY 



Class, Hydropteridae. AVater-ferns. 

 Order, Ma rsilea les. 



Marsileaceae. I\Iarsilea Family. 



46. Marsilea quadrifolia L. European Marsilea. A waif in Frank- 



lin County. 



Order, Salviniales. 



Salviniaceae. Sahinia Familj^ 



47. Azolla caroliuiana AVilld. Carolina Azolla. Hamilton, Lucas, 



Lake. 



Class, IsoETEAE. Quilhvorts. 

 Order. Isoetales. 



Isoetaceae. Quilhvort Family. 



48. Isoetes braunii Durieu. Braun's Quilhvort. Lake Brady, Por- 



tage County — Hopkins. 



49. Isoetes foveolata Eat. Pitted Quilhvort. Lake Brady, Portage 



County- — Hopkins. 



Phylum, CALAMOPHYTA 



Class, Equiseteae. Horsetails and Scouring-ruslies. 

 Order, Equisetalcs. 



Equisetaceae. Horsetail Family. 



50. Equisetum hyemale L. Common Scouring-rush. General. 



51. Equisetum prealtum Raf. Great Scouring-rush. (E. robustura 



A. Br.). General in the state. 



52. Equisetum variegatum Schleich. Variegated Scouring-rush. 



Lake, Erie. 



53. Equisetum laevigatum A. Br. Smooth Scouring-rush. General 



but apparently not common. 



54. Equisetum fluviatile L. Swamp Horsetail. Not common but to 



be found in most parts of the state in suitable places. 



55. Equisetum sylvaticum L. Wood Horsetail. Auglaize, Cuya- 



hoga, Geauga. 



56. Equisetum pratense Ehrli. Thicket Horsetail. Supposed to 



occur in the state but no definite specimens. 



57. Equisetum arveuse L. Field Horsetail. General and abundant. 



