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1-celled dactyl 1-forked 1-furcate accessory branchlets acuminate algae antheridia apices arthrodactylous axes and branchlets axial cortex axillary axis basal branchlet segment brackish water bract-cells bracteoles branchlets furcate branchlets monopodial braunii cells CERNUA CHARA HORNEMANNII CHARA VULGARIS CHARA ZEYLANICA CHARACEAE charophytes CLASSIFICATION CLAVATA considerable ecological dactyls 1-celled dense DIAGNOSTIC FEATURES dioec dioecious stipulodes dioecious strain diplostephanous divided into varieties Ecorticate elongate End segment end-cell fairly common fertile heads FIELD CLUES flexilis gametangia geminate genetic variation globularis gracilis HABITAT haplostichous hard water heads absent heads without mucus heteroclemous internodes isolated clumps large to 18 lateral rays lowest branchlet node macounii medium large microsp microspecies monoecious branchlets monopodial mucronate mucus oospore membrane NITELLA NITELLA ACUMINATA NITELLA FURCATA North America oogonia oogonium plants ponds R. D. Wood Ray Society ray-bearing node sect sex organs shallow water soft-water species specimens spine-cells sterile branchlets subgen tier traits which occur triplostichous tylacanthous unusual traits whorls