184 ULOTHRICACEAE 
may object to the displacement of a traditional name, though we 
believe this change is based on sound principles. 
x opsis of Species 
Chromatophores usually numerous, 91 wall thin. 
Diameter of filaments 6-11 u. موص عدا 7% نے‎ 
Diameter of filaments 3-6 ۰ 3 ۶ EE f. tenu 
Chromatophores 2-4, symmetrically disposed, diameter of cells 5-6 ۸ 
E minus. 
Chromatophores numerous, large, cell-wall thicker, diameter of cdi 11-16.5 ۰ 
3. T. utriculosum. 
1. TRIBONEMA BOMBYCINUM (Agardh) Derb. & Sol. Mem. sur 
physiol. alg. 18. ۸۰ 4. f. zó—21. 1856. 
Conferva bombycina Agardh, Syn. Alg. Scand. 78. 1817; 
Syst. Alg. 83. 1824. Kiitz. Spec. Alg. 371. 1849; Tab. Phyc. 
3: pl. 44. 7, 2. 1853. Rabenh. Flor. Eur. Ale 3: 323. 1868. 
Wille, Öfvers. Vet.-Akad. Förhand. 28835 : ۸۰ 9. f. 41-43, pl. 10. 
کر‎ 57-54, 1881. Lagerh. Flora, 72: 194—209. AM. 6. 1889. Cooke, 
Brit. F. W. Alg. 137. M. 53. f. 4. 1883. Wolle, F. W. Alg. 142. 
pl. 121. f. 6, 9. 1887. DeToni, Syll. Alg. 1: 216. 1889. Bohlin, 
Bihang Svensk. Vet.-Akad. Hand. 23°: No. 3. M. I.f. 1-14. pl. 2 
f. 44-46. 1897. 
Conferva sordida Roth. Cath. Bot. 1: 177. pl. 2. f. 4. 1797.(?) 
Dillw. Brit. Conferv. ^. 60. 1806.(?) Lyngb. Tent. Hyd. Dan. 
138. pl. 26D. 1819.(?)* 
Filaments forming a sordid, yellowish or green floccose mass, 
6-11 p in diameter when mature ; cells cylindrical or somewhat 
inflated, 2—4 times as long as the diameter; chromatophores 
several in a cell, small or of moderate size, scattered or crowded, 
E oil-drops often numerous: cell-wall rather thin (7. 25, 
Exsic.: Phyc. Bor. Am. 620, Malden, Mass, April, 1894 
(F. S. Collins). 
Common and widely distributed in stagnant and flowing waters, 
in spring and fall. 
CONNECTICUT : Thomaston, April ; Watertown, May (563); 
Plymouth, November (666) 
* C. sordida Dillw. was generally regarded as a synonym or variety of C. bomby- 
cina by the older authors. More recently it has been considered a A/icrospora. The 
original description and figures allow no final judgment as to the character of the 
species, hence it would be better if the name were dropped unless type specimens can 
be found. A specimen issued as C. sordida Rabenh. Alg. Sachs. zzo is سیت‎ sp. 
