summer, remnants are to be found in the bottoms of ditches of cold 

 water, trickles from springs, or attached to stones in cold, swift 

 streams. 



Key to the Species 



1. Lateral branches or *he main filament forming a fascicle in 



which there is an axis or rachis apparent throughout 2 



1. Lateral branches of the main filament forming a fascicle which is 

 glomerate and does not show a distinct rachis throughout 3 



2. Lateral branches forming a broad, spreading fascicle 

 which is acuminate; diameter of main filament as 



much as 110^ (mostly 50-90^) D. acuta 



2. Lateral branches forming a narrow, elliptic, or plume-like fascicle, 

 the rachis apparent and much-extended; main filament averaging 



smaller than above, 45-7 0^ in diameter D. plumosa 



3. Fascicles of branches sparingly branched, the branches nearly 



always ending in straight, rigid setae; chloroplast broad 4 



3. Fascicles of branches well-developed and densely tufted in 



fully grown plants; chloroplast narrow D. glomerata 



4. Fascicles of branches narrow in outline, opposite or whorled, arising 



from near the midregion of tlie cell in the main filament D. Judayi 



4. Fascicles arising from the joints of the cells 



in the main filament and stalked.. ._._ D. platyzonata 



Draparnaldia acuta ( C. A. Ag. ) Kuetzing 1845, p. 230 



PL 15, Fig. 1 

 Main axis of the thallus bearing horizontal or ascending branches, 

 from which opposite or whorled fascicles of branchlets arise; branch- 

 lets crowded, ovate to acuminate in outline, with an apparent rachis 

 that extends beyond the other branches of the fascicle. Cells of the 

 main axis and primary branches swollen, 50-100-(110)jli in diam- 

 eter. Chloroplast about 1/2 the length of the cell. Diameter of branch- 

 let cells 6-10/i. 



Among grass in pooled stream, inlet to Buckatobon Lake, Wiscon- 

 sin. 



Draparnaldia glomerata (Vauch.) C. A. Agardh 1812, p. 41 



PI. 15, Fig. 5 



Main axis composed of much-inflated cells, repeatedly branched; 

 branches usually opposite and bearing opposite or whorled fascicles 

 of small branches, which are tufted, orbicular or elliptic in outline, 

 and spreading, without an evident rachis. Cells of the main axis 

 50-100/i in diameter and as much as twice their diameter in length. 

 Chloroplast about 1/3 the length of the cell. Cells in fascicles 6-9/a 

 in diameter. 



Common in shallow water of lakes and pooled streams. Mich., 

 Wis. 



[120] 



