300 MINNESOTA BOTANICAL STUDIES. 



44. Angel, M. Diatomaceous earth. Cal. St. Mining Bur. 

 10th Ann. Report St. Mineralogist for 1890. 533, 584. 1890. 



A deposit in San Luis Obispo county. 



45. Archer, W. A word more on the "Ague Plant." Gre- 

 villea. 2 :166-169. Myl874.— (Mo. Mic. Jour. 12:31,32. 1J11874.) 



A discussion of Botrydium argillaceum. 



46. . New Closterium of New Jersey. Quart. Jour, 



Micr. Sci. 19:120. 1879. 



47. Ard, J. Fucoides alleghaniensis. Proc. Phil. Acad. 

 5:256. (19Agl851.) 1852. 



Three specimens presented to the Society from Lewistown, Pa. 



48. Ardissone, h\ Alghe della Terra del Puego raccolte 

 del Prof. Spegazzini. Rendiconta Reale Instit. Lombard© II. 

 21:208-215.— (Bull. Torr. Bot. Club. 17:158. 9Jel890.) 



A list of 45 species with 3 new. 



49. Arechavaleta, J. Los Vaucheria montevideanos. An- 

 ales del Ateneo del Uruguay. 4 :18. pi. 5, 6. 1883.— (Bot. Zeit. 

 41:627. 21S1883.) 



50. Areschoug, J. E. Algarum (Phycearum) minus rite 

 cognitarum pugillus secundus. Linnaea. 17:257-269. 1843. 



A specimen of Padina deusta Hoolc. from Greenland, is described. 



51. . Virginia, ett nytt algslaegte. Oefvers. Kongl. 



Vet. Akad. Poerhandl. 10:145, 146. 1853.— (Bot. Zeit. 13:562. 

 1855.) 



Collected on the coast of California. Stated to be the Postelsia 

 palmaeformis of Ruprecht. 



52. . Phyceae novae et minus cognitae in maribus 



extra-europaeis coUectae quas descriptionibus atque observa- 

 tionibus adumbravit. Act. Reg. Soc. Sci. III. 1 : 329-372. 1854. 

 Upsala.— (Bull. Soc. Bot. France. 3:204-205. 1856.) 



Some species from South America. 



53. . Observationes phycologicae particula quarta: 



De Laminariaceis nonnullis. Act. Reg. Soc. Sci. III. 11:1883. 

 Upsala.— (Science. 2:21. 6J11883.) 



Includes several forms of Laminariae found in the United States. 



54. Arthur, J. C . History of Floyd county, Iowa.— (Bot. 

 Gaz. 7:127. N1882.) 



Description of some algal forms. 



55. Some Algae of Minnesota supposed to 



be Poisonous. Bull. Minn. Acad. Nat. Sci. 2:(App.) 1-12. 

 31Myl883.— (Fourth Bien. Rep. Bd. Regents Univ. of Minn. 

 Suppl. I. Rep. Dept. Agric. Univ. of Minn. 95-104. 1887. ) 

 Second Rep. on Some Algae of Minnesota supposed to be 

 Poisonous. Fourth Bien. Rep. Bd. Regents Univ. of Minn. 

 Suppl. I. Rep. Dept. Agric. Univ. of Minn. 109-114. 1887. 

 —(Bull. Minn. Acad. Nat. Sci. 3:97-103. 1889) 



