ULOTRICHE^E. 181 







Hormiscia speciosa. (Ccmn.) Rabli. Alg. Eur. in., 363. 



Dark green, 1-2 inches long, threads often crispate, cells 2-4 

 times shorter than their diameter, fructiferous cells subglobose. 



SIZE. Cells -043-'048 mm. diani. 



Ulothrix speciosa, Kutz. Tab. Phy. ii., t. 93. 



Lyngbya speciosa, Carm. Alg. App. ined. Harv. Phyc. 

 Britt. t. 186 B. Brit. Fl. ii., 371. Wyatt Alg. Damn. No. 

 196. 



In brackish and fresh water. 



Scarcely any good features whereby this can be distinguished from H. 

 bicolor. 



Plate LXX. fig. 3. Portions of threads of Hormiscia speciosa X 400 

 diam. 



Hoxmiscia bicolor. (Eng. Sot. i., t. 2288.) 



Bright green. Tufts very long, one foot or more ; articula- 

 tions two to three times shorter than their diameter, pectinate ; 

 cell membrane thick, distinctly lamellose. 



SIZE. Cells *05 mm. diam. 



Ulothrix crispa, Kutz. Tab. Phyc. ii., t. 92, f. 4. Kutz. Spec. 

 348. 



Conferva bicolor, Eng. Bot. i., t. 2288. 



Tyndaridea bicolor, Eng. Bot. ii., t. 2508. Eng. Fl. v., 361. 



Ulothrix bicolor, Ralfs, Alg. Exs. No. 13. 



(?) Sphceroplea crispa, Berk. Glean, t. 3, f. 1. Harv. Man. 

 144. 



Lyngbya crispa, Jenner Fl. Tonb. Wells, 188. 



In fresh water. 



Whether this be really the Sphceroplea crispa of " Berkeley's Glean- 

 ings " seems open to reasonable doubt. 



Plate LXX. Jig. 7. Portion of thread of Hormiscia bicolor with 

 microzoospores in lower cells X 400 diam. 



GEN. 67. ULOTHRIX. Kutz. (1845.) 



Threads articulate, simple ; articulations short, sometimes 

 shorter than their diameter, rarely a little longer ; cell mem- 

 brane thin, often very thin, very rarely lamellose. Cell contents 

 effused, green, parietal, inclosing an amylaceous granule. 



The slight differences between this genus and Hormiscia sceni 

 scarcely sufficient to maintain them as distinct genera. 



