214 Minnesota Algae 



Plate XL fig. II, 12. 



Plant mass widely expanded, woolly, blackish, verging towards red; 

 filaments about 30 mic. in diameter, sparingly branched, variously flexuous 

 or curved; sheaths firm, close, homogeneous, "glassy," up to S mic. in 

 thickness; cells quadrate or shorter than wide; heterocysts having the 

 form and size of the vegetative cells, orange or yellowish; gonidia spheri- 

 cal, blackish or lead-colored; wall of gonidium firm, smooth; cell con- 

 tents distinctly granular, lead-colored becoming purple. 



Hawaii. Forming dark brownish or purplish red cushions on stones 

 in mountain stream. Kaliawaa stream, Makao, Koolauloa, Oahu. June 1900. 

 (Tilden). 



394. Scytonema occidentale Setchell. Notes on Cyanophyceae. — III. Ery- 



thea. 7: 49. 1899. De Toni. Syll. Algar. 5: 503. 1907. 



Plate XI. fig. 13, 14. 



Forming tufts of a somewhat rigid consistency and of a black color; 

 filaments 36 mic. in diameter, decumbent at base, branched; false branches 

 21-27 inic. in diameter, usually in pairs, erect, flexuous, free or included 

 for a longer or shorter distance within a common sheath; sheaths thick, 

 gelatinous, roughene'd, made up of parallel layers; trichomes 18-30 mic. 

 in diameter; cells 9-12 mic. in length, those in the hormogones much 

 shorter, 3 mic. in length; cell contents grayish violet. 



California. Growing upon bare smooth rock bed of La Jota Creek, just 

 above the Falls, on Howell Mt., near St. Helena, Napa County. (Setchell). 



395. Scytonema crispum (Agardh) Bornet. Les Nostocacees heterocystees 



du Systema Algarum de C. Agardh (1824) et leur Synonymic actu- 

 elle (1889). Bull. Soc. Bot. de France. 36: 156. 1889. Bornet and Fla- 

 hault. Revis. des Nostoc. Ann. Sci. Nat. Bot. VII. 5: 89. 1887. (S. 

 cincinnatum Thur.) De Toni. Syll. Algar. 5 : 498. 1907. 

 Dickie. Fresh-water Algae. Brown's Florula Discoana. Contributions to 

 the Phyto-Geography of Greenland within the Parallels of 68° and 70° North 

 Latitude. Trans. Bot. Soc. Edinburgh. 9: 464. 1868. (L. cincinnata Kg.) 

 Wolle. Fresh Water Algae. III. Bull. Torr. Bot. Club. 6: 183. 1877. Nord- 

 stedt. De Algis Aquae Dulcis et de Characeis ex Insulis Sandvicensibus a 

 Sv. Berggren 1875 reportatis. 6. 1878. Wolle. Fresh Water Algae. V. 

 Bull. Torr. Bot. Club. 8: 38. 1881; Fresh- Water Algae U. S. 254. pi. 185. f. 

 8-10. 1887. Johnson and Atwell. Fresh Water Algae. Northwestern Uni- 

 versity. Report Dept. Nat. Hist. 20. 1890. Setchell. Notes on some Cyan- 

 ophyceae of New England. Bull. Torr. Bot. Club. 22: 428. 1895. Collins, 

 Holden and Setchell. Phyc. Bor.-Am. Fasc. 2. no. 60. 1895; Fasc. 14. no. 

 655. 1900. Bessey, Pound and Clements. Additions to the Reported Flora 

 of the State. Bot. Surv. Nebraska. 5: 14. 1901. Collins. The Algae of 

 Jamaica. Proc. Am. Acad. Arts Sci. 37: 241. 1901. Tilden. American Al- 

 gae. Cent. V. no. 480. 1901; Collection of Algae from the Hawaiian Islands. 

 Hawaiian Almanac and Annual for 1902. 112. 1901. Collins. Phycological 

 Notes of the late Isaac Holden. — II. Rhodora. 7: 237. 1905. Lemmer- 



