Myxonema 199 



2. Myxonema amoenum (Kiitz.) 



Stigeoclonium amoenum Kiitz. Phyc. German. 198. 1845 > 

 Spec. Alg. 355. 1849; Tab. Phyc. 3: pi. 6. f 2. 1853. 

 Rabenh. Flor. Eur. Alg. 3: 378. 1868. Wolle, F. W. Alg. 113. 

 pi. 98. f. 4. 1887. DeToni, Syll. Alg. 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 ; diameter of lower cells 1 1.5-16 //, at base 

 of branchlets 6.5-8// (pi. 29). 



Attached to a flag stem, floating in the river. Ipswich, Mass., 

 May, (5 5 8 A). " Mountain springs and pools, Penn." F. Wolle. 



3. Myxonema flagelliferum (Kiitz.) Rabenh. Deutsch. Krypt. 

 Flor. 2 2 : 100. 1847 



Stigeoclonium flagelliferum Kiitz. Phyc. Germ. 198. 1843 5 

 Spec. Alg. 355. 1849; Tab. Phyc. 3://. 10. f. 1. 1853. Rabenh. 

 Flor. Eur. Alg. 3: 378. 1868. Wolle, F. W. Alg. 112.//. 97. f. 

 1. 1887. Scarcely Tilden, Minn. Bot. Stud. 1 : 629. //. 31-35, 

 1896. 



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// in diameter, 4-8 times as long, cylindrical or 

 slightly inflated, at the base of the branchlets 9-10 //. 



Exsic: Phyc. Bor. Am. 408, Bridgeport, Conn., Dec. 1895. 

 (I. Holden). 



This species seems to differ from M. amoenum chiefly in having 

 a slightly larger diameter and setiferous terminal branches. 



Miss Tilden, at the end of her elaborate and painstaking study 

 of Pilinia diluta Wood and Stigeoclonium flagelliferum Kiitz., writes 

 as follows : 



" To avoid adding to the confusion alreading existing in the 

 genus Stigeoclonium, it is thought best to place the plant which 



