50 Minnesota Algae 



one layer of cells; tegument hyaline, mucous, surrounding base of cells; 

 cells 3-4 mic. in diameter at apex, 5.5-7 mic. long, pear-shaped, polygonal, 

 crowded; cell contents bluish green. 



Hawaii. On marine algae. Laysan Island. 1896-97. (Schauinsland). 



113. Xenococcus schousboei Thuret in Bornet and Thuret. Notes Algol. 

 2: 74. pi. 26. f. I, 2. 1880. De Toni. Syll. Algar. 5: 133. 1907. 



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

 New Jersey. Geol. Surv. N. J. 2: 612. 1889. Martindale. Marine Algae of 

 the New Jersey coast and adjacent waters of Staten Island. Mem. Torr. 

 Bot. Club. 1 : 89. 1889. Collins. Notes on New England Marine Algae 

 V. Bull. Torr. Bot. Club. 18: 335. 1891. (Dermocarpa schousboei). 

 Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 12. no. 554. 1899. 

 Setchell. Notes on Cyanophyceae. III. Erythea. 7: 54. 1899. Collins. Pre- 

 liminary Lists of New England Plants, — V. Marine Algae. Rhodora. 2: 43. 

 1900; The Algae of Jamaica. Proc. Am. Acad. Arts Sci. 37: 239. 1901; 

 Phycological Notes of the late Isaac Holden, — I. Rhodora. 7: 172. 1905. 

 Collins, Holden, Setchell. Phyc. Bor.-Am. Fasc. 12. no. 554. 1899. 



Plate III. fig. 7. 



Colonies spherical, solitary and scattered, or grouped in confluent 

 masses which completely surround the filaments of the host, green or 

 bright blue in color; cells 4-9 mic. in diameter, spherical or flattened by 

 mutual pressure; cell contents light bluish-green. 



Maine. (Collins). Connecticut. On Chantransia, Sphace- 

 laria, Rhodochorton. Seaside Park; Black Rock; Fresh Pond; 

 June, July, December. (Holden). Massachusetts. On Rhodochor- 

 ton r o t h i i and Rhizoclonium riparium. Nahant. (Collins). 

 New Jersey. Growing on Lyngbya. Atlantic City. (Martindale). Cal- 

 ifornia. On Calothrix Crustacea, which forms a black velvety coat- 

 ing on smooth rocks near high water mark. Carmel Bay, Monterey County. 

 January 1899. (Setchell and Gibbs). West Indies. On Spermotham- 

 n i o n. Kingston. Jamaica. July 1900. (Pease and Butler). 



114. Xenococcus kerneri Hansgirg. Phys. und Alg. Studien. III. pi. 

 I. f. 19. 1887. De Toni. Syll. Algar. 5: 134. 1907. 



Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 20. no. 952. 1902. 

 Lemmermann. Ueber die von Herrn Dr. Walter Volz auf seiner Weltreise 

 gesammelten Siisswasseralgen. Abh. Nat. Ver. Brem. 18: Collins. Notes 

 on Algae, — VI. Rhodora 5: 234. 1903. Lemmermann. Algenfl. Sandwich- 

 Inseln. Bot. Jahrb. 34: 618. 1905. 



Plate III. fig. 8. 



Colonies irregularly expanded, usually one layer of cells in thickness, 

 crustaceous, about 6-g mic. in thickness, rarely of several layers, nodulose, 

 rough, 9-30 mic. in thickness; tegument thick, inconspicuously lamellose, 

 colorless; cells usually 4-6 mic. in diameter, 4-9 mic. in length, with rounded 

 apices; cell contents dull blue-green or violet; gonidia about 3 mic. in 



