Chara elegans (A. Braun) Robinson 1906, p. 283 



[C. gymnopus var. elegans Allen] 



PL 82, Figs. 13-15 



Plants green, not encrusted with lime; stems triply corticated, 

 with a double row of stipulodes at the nodes, which bear whorls of 

 9-12 leaves; leaves uncorticated in the internode immediately above 

 the node which bears them, the upper row of stipulodes usually 

 exceeding and covering the uncorticated internode; leaves terminat- 

 ing in a long, uncorticated cell, subtended by 3 spine-like cells from 

 the last node; spine cells from the nodes of the cortical cells promi- 

 nent, often forming whorls about the stem; sex organs monoecious, 

 borne at the same node; oogonia 0.4-0.5 mm. in diameter, subtended 

 by 2 pairs of bracteoles which exceed it in length; antheridia 0.5 mm. 

 in diameter. 



In hard water lakes and ponds. Mich., Wis. 



Chara excelsa Allen 1882, p. 43 

 PI. 81, Figs. 7-10 



Plants coarse and brittle, encrusted with lime, 6-14 cm. high; 

 stems bearing 7-8 leaves and a double whorl of stipulodes of which 

 the upper row is longer than the lower; cortication of the internode 

 diplostichous, the primary cortical cells larger and more prominent 

 than the secondary laterals; 2-3 cells at the tip of the leaves un- 

 corticated; sex organs monoecious, produced on the same node; 

 oogonia 0.8-1.5 mm. long, investing cells showing 7-10 turns; bracts 

 sulDtending the oogonium longer than the fruit: antheridia 0.32- 

 0.35 mm. in diameter. 



In shallow water of lakes and ponds. Wis. 



Chara formosa Robinson 1906, p. 296 



Plants rather fragile, very little if at all encrusted with lime, 

 4-30 cm. high; stem triplostichous in cortication, the primary and 

 secondary cells about the same diameter, the cortications bearing 

 spines, some of which are long and recurved, especially in the 

 younger stem internodes; nodes of the stem bearing a whorl of 

 10-15 leaves (mostly 10-11 in our specimens), the lowest internode 

 of which is uncorticated, and a double whorl of stipulodes, the 

 upper series longer and often completely hiding the uncorticated 

 internode of the leaves; leaves also uncorticated at the apex; sex 

 organs monoecious, antheridia and oogonia developing on separate 



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