112 Minnesota Algae 



— V. Marine Algae. Rhodora. 2: 42. 1900. Tilden. American Algae. Cent. 



VI. no. 587. 1902. Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 

 21. no. 1008. 1903. Setchell and Gardner. Algae of Northwestern America. 

 Univ. Calif. Pub. Bot. i: 187. 1903. West. West Indian Freshwater Algae. 

 Journ. of Bot. 42: 291. 1904. Tilden. Notes on a Collection of Algae 

 from Guatemala. Proc. Biol. Soc. Wash. 21: 154. 1908; American Algae. Cent. 



VII. Fasc. I. no. 636. 1909. 



Plate V. fig. 22, 23. 



Filaments more or less regularly spiraled, sometimes straight; sheaths 

 thin, hyaline; trichomes about 2 mic. in diameter; cells 1.2-3 mic. in length; 

 transverse walls marked by two protoplasmic granules. 



Maine. Forming a pale green sediment in water of a pool above high 

 water mark, but reached by the spray. Pemaquid Point. July 1901. (Collins). 

 Massachusetts. Little Pond, Falmouth. (Setchell). Connecticut. In brack- 

 ish water in a small pool, near Norwich; in an aquarium, New Haven, 

 November 1893. (Setchell). Minnesota. On rocks in running water in 

 stone quarry. University campus. Minneapolis. November 1901. (Lilley). 

 Washington. Among various filamentous algae. Whidbey Island; sulphur 

 spring, Ravenna Park, Seattle. (Gardner). Central America. On branch 

 of tree which had been cut off and tHirown into water. Lake Amatitlan, 

 Guatemala. January 1906. (Kellerman). West Indies. Near Bridgetown, 

 Barbados. (Howard). 



217. Lyngbya nana Tilden. American Algae. Century II. no. 179. 1896. De 



Toni. Syll. Algar. 5: 284. 1907. 

 Tilden. Some new Species of Minnesota Algae which live in a Cal- 

 careous or Silicious Matrix. Bot. Gaz. 23: loi. pi. 9. f. 5. 1897; List of 

 Fresh-Water Algae collected in Minnesota during 1896 and 1897. Minn. Bot. 

 Studies. 2: 28. 1898. 



Plate V. fig. 24. 



Filaments 1.9 mic. in diameter, straight; sheaths delicate, hyaline, 

 smooth; trichomes bluntly rounded at apices; cells i-i.S mic. in length; cell 

 contents very pale steel color, or later in the season violet. 



Minnesota. With other algae, forming a calcareous crust on sides of 

 old wooden tank as far up as water line. Minneapolis. October 1895. (Til- 

 den). 



218. Lyngbya subtilis W. West. Algae of the English Lake District. Journ. 



Roy. Micr. Soc. 741. pi. 10. f. 58. 1892. De Toni. Syll. Algar. 5: 



285. 1907. 



West and West. On some Freshwater Algae from the West Indies. 



Journ. Linn. Soc. Bot. 30: 274. 1895. West. West Indian Freshwater Algae. 



Journ. of Bot. 42: 291. 1904. Collins. Notes on Algae. IX. Rhodora. 10: 



162. 1908. 



Filaments solitary and scattered; sheaths close, colorless; trichomes 1.5- 

 1.8 mic. in diameter, somewhat flexuous, free swimming; cells up to twice 

 as long as their diameter; cell contents homogeneous, pale blue-green. 



