ULOTHRIX 155 
The species seems to be less abundant than U. flacca, but it is 
probable that in some cases it has been confused with the latter or 
with fresh water forms. 
Professor Wille (or) has apparently described under the new 
name ہا‎ subflaccida the form which has long been identified as U. 
implexa. His reasons for rejecting, or at least holding in abeyance, 
Kützing's name (chiefly on the ground that it cannot be determined 
from literature just what Kützing'sspecies was) seem to be insuffi- 
cient. Many current names cannot be vouched for with absolute 
certainty, but until their modern application is proved to be incor- 
rect it is less confusing to retain them. One point emphasized by 
Professor Wille is that the habitat of U. implexa as given in the 
Tabulae Phycologicae is “in Graben”’ ; but he seems to have over- 
looked the original description (Bot. Zeitung, 1847) whereitis stated 
that the species is found “in submarinis, inter AJzzoclonzum inter- 
ruptum, —exactly the sort of habitat where we find our U. implexa. 
The illustration in Tabulae Phycologicae is not bad for our species, 
when it is remembered that it was made (probably) from dried ma- 
terial. 
8. ULOTHRIX FLacca (Dillw.) Thuret; Le Jolis, Mem. Soc. Imp. 
Sci. Nat. Cherb. 10: — (56). 1864. Farlow, Mar. Alg. 45. 
1881. Reinbold, Schrift. Nat. Ver. Schles.-Holst. 8: 1:29. 
1889. Foslie, Tromso Mus. Aarsh. 13: 144. M. 3.f. 1-3. 
1890. 
Conferva flacca Dillwyn, Brit. Conferv. pl. 49. 1805. Eng. 
Bot. ^. 7943. 1808. Lyngb. Tent. Hyd. Dan. 144. AX. 49 A. 
1819. Aresch. Phyc. Scand. Mar. 205. 1850. 
Lyngbya Carmichaelii Han. Hook. Brit. Flor. 2': 371. 
1834; Phyc. Brit. 4: e TOO A. 1851. 
Hormidium faccum Kitz. Phyc. Gen. 244. 1843. 
Hormotrichum flaccum Kitz. Spec. Alg. 381. 1849; Tab. 
Phye. 3: pf. 63. 1853. 
Lyngbya flacca Harv. Phyc. Brit. 1: xxxvii; 4: ۸۵ 300. 
1851. 
Hormiscia flacca Aresch. Alg. Scand. 342. 
Urospora penicilliformis Aresch. Act. Reg. Soc. Sci. Upsal. III. 
g No. 1. p. 4... 1874. DeToni, Syll. Als 1: 232. 1889. 
