Myxophyceae 9 



13. Chroococcus pallidus Naegeli. Gatt. Einz. Alg. 46. pi. i. f. 2. 1849. De 



Toni. Syll. Algar. 5: 19. 1907. 



Snow. The Plankton Algae of Lake Erie. U. S. Fish Commission Bull, 

 for 1902. 22:392. 1903. 



Plant mass mucilaginous, pale yellow-ish; plants 7.5-13 mic. in diameter, 

 globose, single or in families of two, four or eight; sheaths oblong-elliptical, 

 colorless; cells 6-1 1 mic. in diameter; cell walls somewhat thick, homogene- 

 ous, hyaline; cell contents finely granular, greenish, yellowish or orange, 

 rarely bluish or blue-green. 



Ohio. Put-in-Bay. I^ake Erie. Summers of 1898, 1899, 1900. (Snow). 



14. Chroococcus cohaerens (Brebisson) Naegeli. Gatt. Einz. Alg. 46. 1849. 



De Toni. Syll. Algar. 5:21. 1907. 



WoUe. Fresh-Water Algae U. S. 335. pi. 210. f. 42. 1887. Webber. 

 The Fresh-Water Aljgae of the Plains. Am. Nat. 23: loii. 1889. Saunders. 

 Protophyta-Phycophyta. Flora of Nebraska. 16. pi. i. f. i. 1894. West 

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

 Linn. Soc. Bot. 30: 275. 1895. Collins, Holden and Setchell. Phyc. Bor.- 

 Am. Fasc. 15. no. 701. 1900. Collins. Phycological Notes of the late 

 Isaac Holden, — II. Rhodora. 7:235. 1905. 



Plant mass green, or later becoming greenish black, gelatinous; sheaths 

 distinct, hyaline, ellipsoid; cells 2.7-6.6 mic. in diameter, globose or oblong, 

 in twos or fours forming colonies 7-15 mic. in diameter; cell wall thin; cell 

 contents homogeneous or slightly granular, of a turbid, blue-green color. 



United States. On damp walls, rocks, etc. (WoUe). Maine. On 

 shaded cliffs. Eagle Island. Penobscot Bay. July 1892. (Collins). Con- 

 necticut. Among other algae, on abutment of Factory Pond dam. Decem- 

 ber. (Holden). Nebraska. Stagnant water. Thedford. (Webber, Saun- 

 ders). West Indies. Amongst other algae on trees. Summit of Trois 

 Pitons (4500 ft.). Dominica. November and December, 1892. (Elliott). 



X5. Chroococcus minor (Kuetzing) Naegeli. Gatt. Einz. Alg. 47. pi. i A. f. 

 4. 1849. De Toni. Syll. Algar. 5: 23. 1907. 

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

 Journ. Linn. Soc. Bot. 30: 275. 1895. Bessey, Pound and Clements. Addi- 

 tions to the reported Flora of the State. Bot. Surv. Nebraska. 5:12. 1901. 



Plate I. fig. 7. 



Plant mass mucous-gelatinous, dull blue-green or olive green; 

 3-4 mic. in diameter, rotund, single or in pairs, angular; sheaths mucous, 

 scarcely visible; cell walls very thin, hyaline; cell contents homogeneous, 

 usually pale bluish-green. 



Nebraska. In aquarium. Lincoln. (Bessey). West Indies. On damp 

 wall of dam. Sharp's River. St. Vincent; on trees. Summit of Trois Pitons 

 (4500 ft.). Dominica. (Elliott). 



Forma minima W. and G. S. West. loc. cit. 275. pi. 16. f. 18. 1895. 



Cells 1-1.9 mic. in diameter; families 10-23 mic. in diameter. 



