134 OHIO BIOLOGICAL SUEVEY 



Class, Htdropteridae. Water-ferns. 

 Order, Marsileales. 



Marsileaceae. Marsilea Family. 



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



lin County. 



Order, Salviniales. 



Salviniacea*. Salvinia Family. 



47. Azolla caroliniana Willd. Carolina AzoUa. Hamilton, Lucas, 



Lake. 



Class, IsoETEAB. Quillworts. 

 Order, Isoetales. 



Isoetaceae. Quillwort Family. 



48. Isoetes braunii D'urieu. Braun's Quillwort. Lake Brady, Por- 



tage County — Hopkins. 



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



County — Hopkins. 



Phylum, CALAMOPHYTA 



Class, Equiseteae. Horsetails and Scouring-rushes. 

 Order, Equisetales. 



Eqnisetaceae. Horsetail Family. 



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



51. Equisetum prealtum Raf. Great Scouring-rush. (B. robustum 



A.Br.). General in the state. 



52. Equisetum variegatum Schleich. Variegated Scouring-rush. 



Lake, Brie. 



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 Ehrh. Thicket Horsetail. Supposed to 



occur in the state but no definite specimens. 



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



