Myxophyceae 1 1 5 



(3 mic.) and lamellose; trichomes 2.5-6 mic. in diameter, not constricted 

 at joints; apex of trichome not tapering; apical cell showing a rotund calyp- 

 tra; cells 1.5-5.5 rnic- in length; transverse walls usually not distinct; cell 

 contents granular, olive green. 



Maine. Near outlet of Long Pond. (Collins). Massachusetts. On 

 sand-covered rocks. Gloucester. (Davis). Rhode Island. At base of cliflfs. 

 Newport. (Farlow). On Enteromorpha intestinalis, in pool at 

 high water mark. Easton's Point, Newport. August 1901. (Simmons). 

 Connecticut. On woodwork between tidemarks, below Yellow Mill bridge; 

 on turfy bottom, Seaside Park; among L. aestuarii, Cook's Point; on 

 sandy mud, Charles Island, May, July, October. (Holden). New York. 

 Shores of Long Island, Jamaica Bay, College Point. Summer. (Pike). 

 New Jersey. On wharves. Atlantic City. (Morse). Florida. (Smith). 



Alabama. Sandy soil, somewhat influenced by marine waters. (Wolle). 

 West Indies. Guadeloupe. (Maze). On roots of mangroves in brackish 

 swamp. Near Bridgetown, Barbados. (Howard). 



223. Lyngbya holdenii De Toni. Syll. Algar. 5: 260. 1907. 



Collins. Preliminary Lists of New England Plants. — V. Marine Algae. 

 Rhodora. 2: 42. igoo. (L. sublilis Holden). Collins, Holden and 



Setchell. Phyc. Bor.-Am. Ease. 21. no. 1007. 1903; Phyc. Bor.-Am. Ease. 

 24. no. 1 163. 1904. Collins. Phycological Notes of the late Isaac Holden. 

 — II. Rhodora. 7: 222. 1905. 



Filaments attached by the middle to other algae, with free ends; 

 sheaths thin, delicate; trichomes 3-4.5 mic. in diameter, constricted at 

 joints; apex of trichome cylindrical or somewhat tapering; apical cell 

 rounded; cells 3-13 mic. in length; cell contents pale green. 



Maine. On bark of piles. Blake's Point. July 1898. (Collins). Massa- 

 chusetts. On perpendicular and overhanging rocks. Marblehead Neck. June 

 1902. (Collins). On Enteromorpha. Magnolia. September 1903. (Ear- 

 low). Connecticut. Seaside Park. December; attached to various marine 

 algae, Bridgeport. (Holden). 



224. Lyngbya digueti Gomont in Hariot. Algues du Golfe de Californie 



recueillies par M. Riguet. Journ. de Hot. 9: 169. 1895. De Toni. 

 Syll. Algar. 5: 284. 1907. 

 Plant mass up to 2 mm. in thickness, caespitose, light green; filaments 

 2.5-3 mic. in diameter, very slender, twisted and entangled in basal portions, 

 elongate, flexible, straight in upper portions; sheaths thin, colorless, papery; 

 trichomes 2-3 mic. in diameter, not constricted at joints; apical cell rotund; 

 calyptra none; cells 1-3-7 mic- in length. 



Lower California. Adhering to insects, in fresh water. Near Santa Ger- 

 trudis. (Diguet). 



225. Lyngbya penicillata Kuetzing. Diagnosen und Bemerkungen zu neuen 



Oder kritischen Algen. Bot. Zeit. 194. 1847. De Toni. Syll. Algar. 

 5: 291. 1907. 

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

 Journ. Linn. Soc. Bot. 30: 274. 1895. 



Plant mass caespitose, dull blue-green; sheaths delicate, smooth, usually 



