Myxophyceae 261 



Notes on Cyanophyceae. — III. Erythea. 7: 46. 1899. Collins. Preliminary 

 Lists of New England Plants. — V. Marine Algae. Rhodora. 2: 41. 1900; 

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



Plate XVI. fig. 15, 16. 



Filaments 9-15 mic. in diameter, .5 mm. in length; gregarious, immersed 

 in the outer cells of Nemalion, blue-green, bulbous and curved at the base 

 (bulb up to 24 mic. in diameter) ; sheaths thin, colorless, often dilated and 

 funnel-shaped at the apex; trichomes 7-8 mic. in diameter, ending in a 

 very long, flexuous hair; cells short; heterocysts basal; hormogones many 

 in the sheath, four or five times longer than the diameter. 



Maine. (Collins). New Hampshire. (Collins). Massachusetts. 



Completely covering Nemalion multifidum growing at low water 

 mark between the Oak Bluff and the Camp Meeting landings, at Cottage 

 City. (Collins). Epiphytic on the fronds of Nemalion multifidum. 

 Wood's Holl. July 1895. (Nott). Rhode Island. On Nemalion. New- 

 port. (Farlow). Connecticut. On Nemalion. Stratford Shoals. July. 

 (Holden). 



470. Calothrix aeruginea (Kuetzing) Thuret. Essai Class. Nostochinees. 

 Ann. Sci. Nat. Bot. VI. i: 10. 1875. Bornet and Flahault. Revis. des 

 Nostoc. Ann. Sci. Nat. Bot. VII. 3: 358. 1886. De Toni. Syll. Algar. 

 S: 612. 1907. 

 Schramm and Maze. Essai Class. Algues Guadeloupe. 30. 1865. (L e i b- 

 leinia flaccida Crouan). Maze and Schramm. Essai Class. Algues 

 Guadeloupe. 20. 1870-1877. (Lyngbya nemalionis Crouan). Collins. 

 Notes on New England Marine Algae. V. Bull. Torr. Bot. Club. 18: 336. 

 1891; Preliminary Lists of New England Plants. V. Marine Algae. Rho- 

 dora. 2: 41. 1900; The Algae of Jamaica. Proc. Am. Acad. Arts Sci. 37: 

 241. 1901. Collins, Holden and Setchell. Phyc. Bor.-Am. Ease. 17. no. 

 804. 1901. Collins. Phycological Notes of the late Isaac Holden. — II. 

 Rhodora. 7: 223. 1905. Vickers. Liste des Algues Marines de la Bar- 

 bade. Ann. Sci. Nat. Bot. VIII. i: 55. 1903. Borgesen and Jonsson. The 

 Distribution of the Marine Algae of the Arctic Sea and of the Northern- 

 most Part of the Atlantic. Botany of the Faeroes. Appendix. XXV. 1905. 



Plate XVII. fig. I. 



Filaments 9-12 mic. in diameter, .5 mm. in length, forming a somewhat 

 continuous light blue-green layer on the surfaces of larger algae, decumbent 

 and slightly thickened at the base; sheaths somewhat thick, very often 

 entirely colorless, rarely yellowish in lower parts, uniform, soft, and gelati- 

 nous in the upper portions; trichomes 7-9 mic. in diameter, ending in a 

 gradually tapering hair; cells short; heterocysts one or two at the base, 

 few or none intercalary, hormogones numerous within the sheath, four to 

 six times longer than wide. 



Maine. Cape Rosier. July 1890; among other algae on woodwork of old 

 v-harf, Otter Creek, Mount Desert Island. July 1900. (Collins). Massa- 

 chusetts. (Collins). Connecticut. Forming a coating on iron piles be- 

 tween tide marks. Black Rock Beacon. August, October. (Holden). West 

 Indies. On Dasya arbuscula. Montego Bay, Jamaica. June 1900. 



