nodes, the oogonia 0.9-0.96 mm. long, subtended by 2 pairs of bracts 

 which are longer than the mature fruit; antheridia 0.28-0.38 mm. in 

 diameter. 



In shallow water of both soft and hard water lakes. Mich., Wis. 



Chara fragilis Desvaux in Loiseleur-Deslongchamps 1810, p. 137 



PI. 82, Figs. 6-8 



Plants moderately stout and of medium coarseness, not heavily 

 encrusted with lime, (2.5)-8-30-(75)cm. high; stem with long 

 internodes and triplostichous cortications, the primary and secondary 

 cortical cells about equal in diameter; the node cells of the primary 

 series of cortications not bearing spines; nodes of the stem with 6-9 

 leaves and a double whorl of very small, sometimes inconspicuous, 

 papilla-like stipulodes, of which the upper series is a little larger 

 and more prominent than the lower; leaf tips uncorticated in the 

 last two cells, ending in a simple, short spine-like cell, the last node 

 of the leaf from which cortical cells are produced, smooth, not 

 giving rise to leaflets or bract cells, the latter also frequently lacking 

 on the sterile nodes of the leaves; plants monoecious, antheridia and 

 oogonia at the same node and subtended by 2 bracts which are 

 about equal to the mature fruit in length, although there are in 

 the same whorl several shorter, sometimes papilla-like bract cells; 

 oogonia 0.8-0.95 mm. long, investing cells showing as many as 17 

 turns; antheridia up to 0.5 mm. in diameter. 



Common in several hard water lakes, especially in shallow water. 

 Mich., Wis. 



Chara sejuncta A. Braun 1845, p. 264 



PI. 82, Figs. 9-12 



Plants fragile, 8-15-(60)cm. high, very little encrusted with lime, 

 spotted in our specimens; stem triplostichous in cortication, the 

 primary and secondary cells about equal in diameter, in the upper 

 internodes very short and mosaic-like, bearing many recurved spines 

 but almost smooth in the older stem internodes; nodes bearing a 

 whorl of 9-13 leaves (usually 10), the lowest internode of which 

 is uncorticated, and double whorl of stipulodes, the upper series 

 of which is longer than the lower and exceeds the length of the 

 uncorticated internode of the leaves; sex organs monoecious, but 

 on different nodes; oogonia 0.96-1.26 mm. long, subtended by at 

 least 2 pairs of bracts which are always shorter than the mature 

 fruit; investing cells of the oogonium showing 8-10 turns; antheridia 

 0.3-0.48 mm. in diameter. 



[339] 



