Myxonema 205 



9. Myxonema aestivale sp. nov. 



Light green, growing in dense tufts 2-5 (rarely 15) mm. long; 

 filaments radiating from a palmelloid base ; branches dichotomous 

 or alternate, erect ; branchlets few, short, erect, very slender, fre- 

 quently approximate near the summit, often attenuate into fine 

 setae ; cells thin-walled, somewhat swollen, 7-9 fi (rarely 1 1 p) in 

 diameter, 2-6 times as long, above about equal to the diameter 



(&33,f> IS)- 



Forming a cespitose covering on the edge of iron fountains 



and watering troughs. 



Vermont : St. Johnsbury, April (673, 674). 



Connecticut : Thomaston, September (493). 



New York : Botanical Garden, June (630), September (479), 

 October (498, 652, 653); Manhattan, July to November (459, 

 489, 483, 487, 510, 463, 654). 



This species appears to be very similar in its general character 

 to Stigeocloniun radians Kiitz. and S. fastigatnm Kutz., but from 

 the fact that it never attains the size of these two species, and 

 appears to be fully mature and not a young form, we have felt 

 obliged to consider it an undescribed species. It is distinguished 

 from the forms mentioned, aside from its smaller size, by longer 

 cells, less abundant branches and less developed setae. This is 

 essentially a summer form ; we have not found it in New York 

 earlier than June, but it is rather abundant m several stations 

 through the summer and early autumn. 



10. Myxonema glomeratum sp. nov. 



Tufts about 8 mm. long, from a dense palmelloid base ; fila- 

 ments radiating, bearing few, alternate branches below ; branches 

 above alternate or rarely opposite, more or less densely penicillate- 

 fasciculate, particularly at the summit, tapering into an acute or 

 long setiferous point ; cells of main branches 1 1-14 fi in diameter, 

 2-7 times as long, cylindrical or slightly swollen, chromatophore 

 broadly zonate ; cells of branchlets 6-8 fi in diameter, 1-2 times 

 as long, chromatophore dense (//. 34). 



Attached to twigs in a nearly stagnant pool, and in the iron 

 basin of a fountain. 



New York : East Chester, May (390, 591) ; Central Park, 

 June (623). 



