PLANTS OF RHODE ISLAND. 113 



6. aristiferum, Ralfs. Neutakonkanut, &c. 



7. Avicula, Breb. Common. 



8. Bieneanum, Rab., var. ellipticum, Wille. Providence. 



9. margaritaceum, Ehrb. Common. 



10. crenatum, Bailey. " Rhode Island, Bailey.''^ R. "W. Park. 



11. polymorphum, Breb. Spectacle Pond. 



12. crenulatum, (Xaegr.) Delp. Common. 



13. muricatum, Breb. Benedict, Spectacle and Mashapaug 



Ponds. 



14. asperum, Breb. In same localities. 



15. rugulosum, Breb. Common. 



16. punctulatum, Breb. Providence, Mr. Lathrop. 



17. pygmaeum, Breb. f. truncatum, Wolle. Common. 



18. alternans, Breb. Common. 



19. cyrtocerum, Breb. Common. No. 147. 



20. paradoxum, Meyen. Quidnessett, &c. 



21. arachne, Ralfs. Common. 



22. scabrum, Breb. Lonsdale Pond. 



23. incisum, AVoUe. Quidnessett. 



24. cerastes, Lund. Spectacle Pond. 



25. gracile, Ralfs. Providence, Mr. Lathrop; Spectacle Pond. 



Xo. 145. 



26. Ophiura, Lund. Common. 



var. tetracerum, Wolle. 

 S. tetracerum, Ralfs. Alg. Rhod. No. 146. 



27. macrocerum., Wolle. Spectacle Pond. 



28. Rotula, Xord. Neutakoukanut. 



29. leptocladum, Nord. Providence. 



30. grallatorium, Nord. Common. 



31. iotanum, Wolle. Davisville Brook, &c. 



32. vestitum, Ralfs. Common. 



33. teliferum, Ralfs. Providence. 



34. echinatum, Breb. Providence. 



35. hirsutum, (Ehrb.) Breb. Providence, &c. No. 143. 



36. Hystrix, Ralfs. Providence, &c. No. 144. 



37. furcigerum, Breb. Quidnessett. 



38. eustephanum, (Ehrb.) Ralfs. Apponaug, &c. 



39. spongiosum, Breb. Common. 



40. arctison, Ehrb. Neutakoukanut. 



41. enorme, Ralfs. Providence. 



8 



