132 Minnesota Algae 



at the base, ascending in less flexuous, somewhat parallel fascicles, not 

 branched; sheaths thin, firm, somewhat mucous below; trichomes 3.4-4 mic. 

 in diameter, not constricted at joints; apex of trichome slightly tapering; 

 apical cell obtuse conical; calyptra none; cells 1.5-4 mic. in length; trans- 

 verse walls hardly visible, not granulateil. 



Massachusetts. Forming minute green, plush-like patches on ground. 

 Near Black Rock, Middlesex Fells. (Collins). Connecticut. Occurring 

 abundantly on flower pots in greenhouse. New Haven. (Setchell). 



255. Symploca borealis Rabenhorst. Fl. Eur. Algar. 2: 156. 1865. De 



Toni. SylL Algar. 5: 309. 1907. 

 Plant mass fasciculated, bright bluish or blue-green; fascicles 6-8 mm. 

 up to 2.5 cm. in height, tapering from a broad lamelliform base up to a 

 loose, somewhat penicillate apex; filaments 7-10 mic. in diameter, loosely 

 agglutinated by a colorless' mucus; sheaths close, sometimes swollen, 

 homogeneous, very smooth, colorless, often empty in upper portions; 

 trichomes S-6 mic. in diameter, somewhat equal, slightly curved, erect, 

 somewhat parallel, entangled, rarely interrupted; cells a little longer than 

 their diameter, after division shorter; cell contents granular, bright blue- 

 green. 



Greenland. On Bartramia ithyp h y 1 1 a and B. f o n t a n a. 

 (Breutel). 



256. Symploca muscorum (Agardh) Gomont. Essai Class. Nostocacees 



homocystees. Morot. Journ. de Bot. 4: 354. 1890; Monogr. Oscill. 

 130. pi. 2. f. 9. 1893. De Toni. Syll. Algar. 5: 303. 1907. 



Maze and Schramm. Essai Class. Algues Guadeloupe. 19, 29. 1870-1877. 

 (Ph. spadiceum Crouan, Ph. smaragdinum Crouan, L. grave- 

 o I e n s Crouan). Wolle. Fresh Water Algae. III. Bull. Torr. Bot. Club. 

 6: 183. 1877; (Ph. lyngbyaceum Kuetz.). Fresh-Water Algae U. S. 

 299. pi. 201. f. 22-26. 1887. (L. phormidium Kuetz.). Wolle and Mar- 

 tindale. Algae. Britton's Catalogue of Plants found in New Jersey. Geol. 

 Surv. N. J. 2: 608. 1889. Tilden. American Algae. Cent. I. no. 66. 1894; 

 List of fresh-water Algae collected in Minnesota during 1894. Minn. Bot. 

 Studies. 1 : 235. 1895. West and West. On some Freshwater AJga 

 the West Indies. Journ. Linn. Soc. Bot. 30: 264. 1895. ColliflSn^ 

 and Setchell. Phyc. Bor.-Am. Fasc. 8. no. 3S3. 1897. SetchelkV' 

 Cyanophyceae. III. Erythea. 7: 53. 1899. Collins, H olden . and~%| 

 Phyc. Bor.-Am. Fasc. 21: no. loio. 1903. Setchell and Gardner. Algae 

 Algae of Northwestern America. Univ. Calif. Pub. Bot. i : 188. 1903. 

 West. West Indian Freshwater Algae. Journ. of Bot. 42: 291. 1904. Col- 

 lins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 25. no. 1208. 1005. 



Plate V. fig. 54. 



Plant mass fasciculate or mucous and Phormidium-like, extensive, 

 blackish, dark green or blue-green; fascicles twisted, creeping, rarely erect, 

 filaments flexible, densely crowded, at the base twisted and entangled, in 

 upper portions less twisted, somewhat parallel; not branched; sheaths up 

 to 2 mic. in diameter, firm, tenacious, or more or less mucous; trichomes 



