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1-furcate 2-celled dactyls 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 central secondary CERNUA CHARA HORNEMANNII CHARA VULGARIS CHARA ZEYLANICA CHARACEAE charophytes CLASSIFICATION CLAVATA considerable ecological dactyls 1-celled dense DIAGNOSTIC FEATURES dioec dioecious branchlets 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 monoecious stipulodes monopodial mucronate mucus oospore membrane NITELLA ACUMINATA North America oogonia oogonium oospore membrane reticulate plants ponds R. D. Wood rarely Ray Society sect sex organs shallow water soft-water specimens spine-cells sterile branchlets subgen traits which occur triplostichous tylacanthous unusual traits whorls whorls compacted