21-8 Minnesota Algae 



Plate XVI. fig. 9- 



Filaments gregarious and stellately fasciculate, attached to filiform al- 

 gae, curved, decumbent and slightly thickened at the base, blackish green, 

 21-29 mic. in diameter, .3 mm. in length; sheaths close, membranaceous, 

 brownish, with dilated, funnel-shaped apex, the outside layers colorless; 

 trichomes 12 mic. in diameter; cells three times shorter than the diameter; 

 heterocysts basal; cell contents olive. 



Washington. On grasses in a salt marsh. Head of Penn's Cove, near 

 Coupeville, Whidbey Island. (Gardner). 



465. Calothrix fusco-violacea Crouan in herb. Thuret and Mus. Paris. Bor- 



net and Flahault. Revis. des Nostoc. Ann. Sci. Nat. Bot. VII. 3: 



352. 1886. De Toni. Syll. Algar. 5: 608. 1907. 

 Setchell. Notes on Cyanophyceae. — I. Erythea. 4: 87. 1896. Collins, 

 Holden and Setchell. Phyc. Bor.-Am. Fasc. 5. no. 217. 1896. Collins. Pre- 

 liminary Lists of New England Plants. — V. Marine Algae. Rhodora. 2: 41. 

 1900. 



Plate XVI. fig. 10. 



Filaments 8-12 mic. in diameter, .5 mm. in length, gregarious, forming a 

 velvety, indefinite or violet mass, bent and thickened at the base; sheaths 

 close, thin, colorless, uniform, gelatinous and diffluent in upper parts; trich- 

 omes 7-8 mic. in diameter, constricted at joints, at first ending in a short 

 hair which falls off when hormogones are formed, leaving apex truncate; 

 cells shorter than their diameter; heterocysts basal, often worn out; hormo- 

 gones many within the sheath, up to ten times longer than their diameter. 



Massachusetts. Forming orbicular velvety patches, reddish purple to 

 dark blue-green in color, onPunctaria plantaginea. Wood's Hole. 

 Summer of 1895. (Nott). 



466. Calothrix scopulorum (Weber and Mohr) Agardh. Syst. Algar. 70. 



1824. Bornet and Flahault. Revis. des Nostoc. Ann. Sci. Nat. Bot. 

 VII. 3: 3S3. 1886. De Toni. Syll. Algar. 5: 608. 1907. 

 Harvey. Nereis Boreali-Americana. Part III. 105. 1858. Farlow. List 

 Marine Algae United States. Proc. Am. Acad. Arts Sci. 10: 380. 1875. 

 Kjellman. Algae of the Arctic Sea. 322. 1883. Pike. Check List of Marine 

 Algae. Bull. Torr. Bot. Club. 13; 105. 1886. Collins. Algae from Atlantic 

 City, N. J. Bull. Torr. Bot. Club. 15: 310. 1888. Bennett. Plants of Rhode 

 Island. 95. 1888. Martindale. Marine Algae of the New Jersey coast and 

 Adjacent Waters of Staten Island. Mem. Torr. Bot. Club, i: 91. 1889. 

 WoUe and Martindale. Algae. Britton's Catalogue of Plants found in New 

 Jersey. Geol. Surv. N. J. 2: 603. 1889. Collins. Algae. — Rand and Red- 

 field's Flora of Mount Desert Island, Maine. 246. 1894. Rosenvinge. Les 

 Algues Marines du Groenland. Ann. Sci. Nat. Bot. VII. 19: 162. 1894; 

 Deuxieme Memoire sur les Algues marines du Groenland. Medd. om Groen- 

 land. 20: 121. 1898. Collins. Preliminary Lists of New England Plants. — 

 V. Marine Algae. Rhodora. 2: 41. 1900. Saunders. The Algae. Harriman 

 Alaska Expedition. Proc. Wash. Acad. Sci. 3: 399. 1901. Collins, Holden 

 and Setchell. Phyc. Bor.-Am. Fasc. 17. no. 805. 1901. Setchell and Gard- 



