148 ULOTHRICACEAE 
Conferva zonata Web. & Mohr, Naturhist. Reise Schwed. 97. 
pl. r. f. 7. 1804. Lyngb. Tent. Hyd. Dan. 136. A. 45. 1819. 
Agardh, Syst. Alg. 90. 1824. 
Conferva lucens Dillwyn, Brit. Conferv. ûl. 37. 1805. Eng. 
Bot. ai 7635. 1806. 
Myxonema zonatum Fries, Syst. Orb. Veg. I: 343. 1825; 
Flor. Scan. 329. 1835. Rabenh. Deutsch. Krypt. Flor. 27: 99. 
1847. 
Lyngbya sonata Hass. Brit. F. W. Alg. 220. fl. 59. 1845. 
Hormiscia zonata Aresch. Act. Reg. Soc. Sci. Upsal. III. 6 : 
No. 2. p. 12. fl. 2. 1866. Rabenh. Flor. Eur. Alg.. 3: 362. 
1868. Cooke, Brit. F. W. Alg. 179. pl. 69. 1883. De Wild, 
Flor. Ale Belg. 36. f. 72. 1896; Flor. Buitenz. 3: 57. f. 7. 1900. 
The filaments form  yellowish-green, fluctuating masses, 
.5-2 dm. in length; cells cylindrical or somewhat swollen, 1 1— 
45% in diameter, 14-1 14 (in young filaments 3) times as long; 
the cell-wall at first thin, with age growing thicker, especially in 
the circumferential region of the septations, so that the larger cells 
appear to be constricted at the joints; chromatophore forming a 
broad or narrower girdle, enclosing several large pyrenoids ( 7. 
20. f. 1—4). 
Exsicc.: Phyc. Bor. Am. 79. A. Fairfield, Conn., Jan. 1894. 
(I. Holden); Not 79. B. (=Microspora amoena). Tild. Am. Alg. 
7. Minneapolis, Minn., April, 1894; 737. (var. valida Nag.) Lake 
Superior, Minn., Jul. 1896. (A. H. Elftman). 
On stones or wood, ín quiet or rapid waters. 
VERMONT: St. Johnsbury, April (672); North Hero, June 
(681); Alburg, Lake Champlain ; 30 June (683). 
Connecticut: Derby, April (538); Thomaston, May (567). 
New York: Williamsbridge, April (95, 294); Woodlawn, 
May (596), Bronx Park, May (373); Central Park, March (260), 
April (323, 525, 84), May (104, 381, 382, 386, 594), June (614, 
619). 
New Jersey: Nordhoff, May (356). 
Ipano: Nez Perces county, 1896 (A. A. Heller). 
Small forms of this species make their appearance in the drink- 
ing fountains and horse troughs of New York in early spring. At 
first one would be inclined to refer these forms to some smaller 
species, but prolonged observation of the development is suffi- 
