"Character / Feature";"C. baltica";"C. hispida";"C. polyacantha";"C. rudis" "Plant axis";"robust, slender";"robust, thick";"erect, robust";"robust, thick" "Plant size";"medium size, 6–27 cm high, 1–2 mm in diameter";"medium large to large species, up to 18–70 cm high, 4–5 in diameter";"medium large to large, 30–75 cm high, up to 5 mm in diameter";"medium large to large plants, 23–65 cm high, up to 4–6 mm in diameter" Color;"light to dark green";"green to greyish green";"green to dark green";"green to greyish green" Incrustation;unincrusted;"moderately to heavily incrusted";"moderately incrusted";"moderately to heavily incrusted" Internodes;"longer or as long as branches";"longer than branches";"similar length or longer (up to 2 times) than branches";"up to 2 times longer than branches" Branchlet;"up to 8 branches in a whorl, stout to slender with 5–8 segments";"7–10 branches in a whorl, straight and rigid, with 5–9 segments";"8–10 branches in a whorl with 6–9 segments";"7–10 branches in a whorl, with 6–7 segments" Cortification;"diplostichous and slightly thylacanthous";"diplostichous, aulacanthous, often isostichous on older internodes";"diplostichous and tylacanthous occasionally irregular";"diplostichous, strongly heterostichous and aulacanthous" "Spine cells";"shorter than axis diameter, solitary or in pairs";"solitary or in fascicles as long as the axis diameter";"in bunches, as long or longer than the axis diameter";"sparse in pairs, similar in length as plant axis" Stipulodes;"stipulodes in two rows similar in length to spine cells";"stipulodes in two rows, uppers are similar to lowers";"stipulodes in two rows, as long as axis diameter";"stipulodes are in two rows, uppers similar to lowers" Reproduction;monoecious;monoecious;monoecious;monoecious Oogonia;"540–1165 μm long, 515–650 μm wide";"415–1200 μm long, 520–770 μm wide";"625–1140 μm long, 450–615 μm";"890–1210 μm long, 415–750 μm wide" Antheridia;"420–630 μmin diameter";"490–730 μm in diameter";"375–530 μm in diameter";"370–480 μm in diameter" Oospores;"black, 465–925 μm long and 335–645 μm wide";"reddish brown to dark brown, 545–810 μm long, 390–760 μm wide";"brown, dark brown or black, 485–900 μm long, 270–585 μm wide";"brown to dark brown–almost black, 620–925 μm long, 395–835 μm wide"