136 Minnesota Algae 



Plate V. fig. s8. 



Plant mass caespitose or mucous, widely expanded, dark green; fila- 

 ments adnate, unbranched at base, branched in upper portions; false 

 branches numerous, somewhat appressed; sheaths wide, mucous, roughened 

 in outline, tapering or often open at apex, sometimes entirely diffluent 

 and agglutinated; trichomes 8-16 mic. in diameter, not constricted at joints, 

 numerous at base of filament, spirally • twisted and entangled, solitary in 

 the branches; apex of trichome tapering, truncate; cells 2.5-4.5 mic. in 

 length; transverse walls granulated. 



Massachusetts. (Collins). New Jersey. On moist low grounds near 

 Atlantic City. (Wolle). Florida. (Smith). Bermudas. (Farlow). 



West Indies. Barbados. (Vickers). 



Var. a. Gomont. 1. c. 76. 



Setchell. Notes on Cyanophyceae. — I. Erythea. 4: 89. 1896. Collins, 

 Holden and Setchell. Phyc. Bor.-Am. Fasc. no. 204. 1896. 



Plant mass caespitose, usually epiphytic; sheaths somewhat firm. 



Massachusetts. Very abundant on the fronds ofAscophyllum no- 

 dosum in the harbor. Woods Hole. Summer of 1904. (Nott, Setchell). 



Var. p rupestre Kuetzing. 1. c. 259. Gomont. 1. c. 76. De Toni. 1. c. 318. 



Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 5. no. 205. 1896. 

 Collins. Notes on New England Marine Algae. — ^VI. Bull. Torr. Bot. Club. 

 23: I. 1896. Collins. Preliminary Lists of New England Plants. — V. 

 Marine Algae. Rhodora. 2: 42. 1900. 



Plant mass expanded, mucous; sheaths entirely diffluent. 



Maine. At first forming gelatinous sheaths on Zostera and R u p- 

 p i a, afterwards floating masses, in warm water of tidal basin. Goose 

 Cove, Rosier. July 1895. (Collins). 



261. Hydrocoleus glutinosus (Agardh) Gomont. Essai Class. Nostocacees 

 homocystees. Morot. Journ. de Bot. 4: 353. 1890; Monogr. Oscill. 

 77. 1893. De Toni. Syll. Algar. 5: 318. 1907. 

 Schramm and Maze. Essai Class. Algues Guadeloupe. 30. 1865. (O. 

 fusco-rubra Crouan). Maze and Schramm. Essai Class. Algues 



Guadeloupe. 15. 1870-1877. Farlow. List Marine Algae U. S. Proc. Am. 

 Acad. Arts Sci. 10: 380. 1875. (L. nigrescens Harv.). Murray. Cata- 

 logue of the Marine Algae of the West Indian Region. Journ. of Bot. 

 27: 261. 1889. (O. glutinosa A. Br.). Collins, Holden and Setchell. 

 Phyc. Bor.-Am. Fasc. 10. no. 453. 1898. Collins. Preliminary Lists of 

 New England Plants. — VI. Marine Algae. Rhodora. 2: 42. 1900; Phycolog- 

 ical Notes of the late Isaac Holden. — II. Rhodora. 7: 223. 1905. Vickers. 

 Liste des Algues Marines de la Barbade. Ann. Sci. Nat. Bot. VIII. i: 45. 

 1905- 



Plate V. fig. 59. 



Plant mass not caespitose, mucous, indefinitely expanded or cylin- 

 drical in shape, yellowish brown or dull or yellowish green; sheaths very 

 irregular in outline and somewhat amorphous, finally entirely diffluent; 



