i65 Minnesota Algae 



314. Nostoc linckia (Roth) Bornet in Bornet and Thuret. Notes Algol- 

 ogiques. 86. pi. 18. f. 1-12. 1880. Janczewski. Observations sur la 

 Reproduction de quelques Nostochinees. Ann. Sci. Nat. Bot. V. 19: 

 127. pi. 9. f. C. 1874. (N. minutissimum Jancz.). Bornet and 

 Flahault. Revis. des Nostoc. Ann. Sci. Nat. Bot. VII. 7: 192. 1888. 

 De Toni. Syll. Algar. 5: 391. 1907. 



Nordstedt. De Algis Aquae Dulcis et de Characeis ex Insulis Sand- 

 vicensibus a Sv. Berggren 1875 reportatis. 5. 1878. (N. intricatum 

 Menegh.). Setchell. Notes on Cyanophyceae. — I. Erythea. 4: 89. 1896. 

 Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 11. no. 507. 1898. Bes- 

 sey, Pound and Clements. Additions to the Reported Flora of the State. Bot. 

 Surv. Nebraska. 5: 12. 1901. Setchell and Gardner. Algae of Northwest- 

 ern America. Univ. Calif. Pub. Bot. i: 189. 1903. Lemmermann. Algenfl. 

 Sandwich.-Inseln. Bot. Jahrb. 34: 622. 1905. 



Plate VII. fig. I. 



Colonies of various sizes, sometimes punctiform, expanded, at first 

 globose, soon becoming enlarged and finally clathrate-fenestrate and ir- 

 regularly torn, sometimes into filiform portions, gelatinous, blue-green or 

 violet in color, or becoming darker; filaments numerous, abruptly twisted 

 and flexuous; sheaths distinct near the surface of the mass, within con- 

 fluent and transparent; trichomes 3.5-4 mic. in diameter, pale gray-green; 

 cells short, depressed globose; heterocysts S-6 mic. in diameter, somewhat 

 spherical; gonidia 6-7 mic. in diameter, 7-8 mic. in length, somewhat glo- 

 bose, with a smooth outer membrane becoming darker with age. 



Connecticut. Occurring in Lake Saltonstall, near New Haven. (Setch- 

 ell). "It forms thickish sheets of a pale green color and very much crum- 

 pled. Occasionally some trace of its original globular shape is preserved 

 and it forms large imperfect bladders several inches in diameter." — Setchell. 

 South Dakota. In clear running spring water. Roberts County. (Saunders). 

 "At first forming small, solid spherical masses, attached to stones, weeds, 

 etc., finally becoming detached and forming hollow, torn, warty, dark 

 brown masses, sometimes 10 cm. in diameter." — Collins, Holden and 

 Setchell. Nebraska. In ponds. South Bend. (Bessey). Washington. 



Floating, intermingled with other algae, on ponds of fresh water. Near 

 Coupeville, Whidbey Island. (Gardner). Hawaii. With Conferva 



sandvicensis and other algae in ponds. Paoa Valley, Oahu. 1875. 

 (Berggren). 



315. Nostoc piscinale Kuetzing. Phyc. Gen. 208. 1843. Bornet and Flahault. 

 Revis. des Nostoc. Ann. Sci. Nat. Bot. VII. 7: 194. 1888. De Toni. 

 Syll. Algar. 5: 393. 1907. 



McClatchie. Proc. Southern Calif. Acad, i: 346. 1897. (N. rivulare). 

 Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 8. no. 355. 1897. 

 Richter. Susswasseralgen aus dem Umanakdistrikt. Bib. Bot. Heft. 42. 5. 

 1897. Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 23. no. 11 11. 

 1903. Lemmermann. Algenfl. Sandwich-Inseln. Bot. Jahrb. 34: 622. 1905. 



