134 OHIO BIOLOGICAL SUEVEY 



Class, Hydropteridae. Water-ferns. 

 Order, Marsileales. 



Marsileaceae. Marsilea Family. 



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



lin County, 



Order, Salviniales. 



Salviniaceae. Salvinia Family. 



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



Lake. 



Class, IsoETEAE. Quillworts. 

 Order, Isoetales. 



Isoetaceae. Quillwort Family. 



48. Isoetes braunii Durieu. 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 S^ouring-rushes. 

 Order, Equisetales. 



Equisetaceae. Horsetail Family. 



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



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



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 Ehrh. Thicket Horsetail. Supposed to 



occur in the state but no definite specimens. 



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



