MYXONEMA 199 
2. Myxonema amoenum (Kütz.) 
Stigeoclonium amoenum Kitz. Phyc. German. 198. 1845; 
Spe Alp. 39%. 15490; Tab. Phyc 3: M 6. X & 1833. 
Rabenh. Flor. Eur. Alg. 3: 378. 1868. Wolle, F. W. Alg. 113. 
pl. 98. f. 4. 1887. DeToni, Syll. Ale 1 : 202. 1889. 
Cespitose, light green, about 5 mm. long. Filaments much 
branched, branches mostly opposite throughout, frequently two or 
three pairs approximate, arising from short angular cells ; branch- 
lets tapering and pointed but usually not setiferous. Cells of 
main branches nearly cylindrical, frequently slightly inflated, 3-8 
times as long as the diameter, above 2-4 times as long as the 
diameter, and finally in the branches subequal ; chromatophore 
thin and narrow below ; ي‎ of lower cells 11.5-16 ,م‎ at ane? 
of branchlets 6.5-8 ۸ ( pl. 2 
Attached to a flag "sa i in the river. Ipswich, Mass., 
May, (558A). “ Mountain springs and pools, Penn." F. Wolle. 
3. MYXONEMA FLAGELLIFERUM (Kiitz.) Rabenh. Deutsch. Krypt. 
Flor. F: 100. 1847 
Stigeoclonium flagelliferum Kitz. Phyc. Germ. 198. 1843; 
Spec. Ale 355. 1849; Tab. Phyc. 3: 2. ro. f. 1. 1853. Rabenh. 
Flor. Eur. Ale 3: 378. 1868. Wolle, F, W. Ale 112. MX. 97. f. 
I. 1887. Scarcely Tilden, Minn. Bot. Stud. 1: 629. M. 31-35. 
1896. 1 
Tufts 5-20 mm. long, bright green ; branches mostly in pairs, 
often 2-4 approximate on short somewhat globose cells ; branch- 
lets flagelliform, attenuate into long setae; cells of the lower 
branches 14-18 p in diameter, 4-8 times as long, cylindrical or 
slightly inflated, at the base of the branchlets 9-10 ۰ 
Exsıc.: Phyc. Bor. Am. 408, Bridgeport, Conn., Dec. 1895. 
(I. Holden). 
This species seems to differ from ۸7 amoenum chiefly in having 
a slightly larger diameter and setiferous terminal branches. 
Miss Tilden, at the end of her elaborate and painstaking study 
of Pılinia diluta Wood and Stigeoclonium flagelliferum Kütz., writes 
as follows: 
“To avoid adding to the confusion alreading existing in the 
genus Stigeoclonium, it is thought best to place the plant which 
