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  Plantae
      Streptophyta
            Zygnematophyceae
                    Zygnematales
                            Closteriaceae
                                     Closterium
                                             Closterium abruptum
                                               Closterium abruptum var. abruptum
                                               Closterium abruptum var. brevis
                                               Closterium abruptum var. canadense
                                             Closterium acerosum
                                               Closterium acerosum var. acerosum
                                               Closterium acerosum var. angolense
                                               Closterium acerosum var. elongatum
                                               Closterium acerosum var. minus
                                             Closterium aciculare
                                               Closterium aciculare var. aciculare
                                               Closterium aciculare var. brevis
                                             Closterium acutum
                                               Closterium acutum var. acutum
                                               Closterium acutum var. linea
                                               Closterium acutum var. variabile
                                             Closterium angustatum
                                               Closterium angustatum var. angustatum
                                               Closterium angustatum var. annulatum
                                               Closterium angustatum var. boergesenii
                                               Closterium angustatum var. gracile
                                             Closterium archerianum
                                               Closterium archerianum var. archerianum
                                               Closterium archerianum var. major
                                             Closterium arcuarium
                                             Closterium attenuatum
                                             Closterium baillyanum
                                               Closterium baillyanum var. baillyanum
                                               Closterium baillyanum var. parvulum
                                             Closterium braunii
                                             Closterium brebissonii
                                             Closterium brunelii
                                             Closterium calosporum
                                               Closterium calosporum var. brasiliense
                                               Closterium calosporum var. caloporuum
                                             Closterium closterioides
                                             Closterium cornu
                                               Closterium cornu var. arcum
                                               Closterium cornu var. cornu
                                             Closterium costatum
                                               Closterium costatum var. costatum
                                               Closterium costatum var. dilatatum
                                               Closterium costatum var. scotii
                                               Closterium costatum var. subcostatum
                                               Closterium costatum var. westii
                                             Closterium cuspidatum
                                             Closterium cynthia
                                               Closterium cynthia var. cynthia
                                               Closterium cynthia var. jenneri
                                             Closterium delpontii
                                             Closterium dianae
                                               Closterium dianae var. arcuatum
                                               Closterium dianae var. brevius
                                               Closterium dianae var. dianae
                                               Closterium dianae var. excavatum
                                             Closterium didymotocum
                                             Closterium eboracense
                                             Closterium ehrenbergii
                                               Closterium ehrenbergii var. ehrenbergii
                                               Closterium ehrenbergii var. malinvernianum
                                             Closterium eriense
                                             Closterium flaccidum
                                             Closterium gracile
                                               Closterium gracile var. elongatum
                                               Closterium gracile var. gracile
                                               Closterium gracile var. tenue
                                             Closterium idiosporum
                                             Closterium incurvum
                                             Closterium intermedium
                                               Closterium intermedium var. hibernicum
                                               Closterium intermedium var. intermedium
                                             Closterium jenneri
                                               Closterium jenneri var. jenneri
                                               Closterium jenneri var. robustum
                                             Closterium juncidium
                                               Closterium juncidium var. brevius
                                               Closterium juncidium var. elongatum
                                               Closterium juncidium var. juncidium
                                             Closterium juncidum
                                             Closterium kuetzingii
                                               Closterium kuetzingii var. kuetzingii
                                               Closterium kuetzingii var. sigmoides
                                               Closterium kuetzingii var. vittatum
                                             Closterium lagoense
                                             Closterium lanceolatum
                                               Closterium lanceolatum var. lanceolatum
                                               Closterium lanceolatum var. parvum
                                             Closterium laterale
                                             Closterium leibleinii
                                               Closterium leibleinii var. leibleinii
                                               Closterium leibleinii var. recurvatum
                                             Closterium libellula
                                               Closterium libellula var. intermedium
                                               Closterium libellula var. interruptum
                                               Closterium libellula var. libellula
                                             Closterium limneticum
                                               Closterium limneticum var. fallax
                                               Closterium limneticum var. limnecticum
                                             Closterium lineatum
                                               Closterium lineatum var. costatum
                                               Closterium lineatum var. latius
                                               Closterium lineatum var. lineatum
                                             Closterium liniatum
                                             Closterium littorale
                                             Closterium lunula
                                               Closterium lunula var. coloratum
                                               Closterium lunula var. gracilis
                                               Closterium lunula var. lunula
                                               Closterium lunula var. maximum
                                               Closterium lunula var. minor
                                             Closterium macilentum
                                             Closterium malinvernianiforme
                                             Closterium malmei
                                             Closterium moniliferum
                                               Closterium moniliferum var. concavum
                                               Closterium moniliferum var. miniliferum
                                               Closterium moniliferum var. subrectum
                                             Closterium navicula
                                               Closterium navicula var. crassum
                                               Closterium navicula var. inflatum
                                               Closterium navicula var. navicula
                                             Closterium nematodes
                                             Closterium obtusum
                                             Closterium parvulum
                                               Closterium parvulum var. angustum
                                               Closterium parvulum var. maius
                                               Closterium parvulum var. obtusum
                                               Closterium parvulum var. parvulum
                                               Closterium parvulum var. taylori
                                             Closterium peracerosum
                                               Closterium peracerosum var. elegans
                                               Closterium peracerosum var. peracerosum
                                             Closterium porrectum
                                             Closterium praelongum
                                               Closterium praelongum var. brevior
                                               Closterium praelongum var. brevius
                                               Closterium praelongum var. crassius
                                               Closterium praelongum var. elongatum
                                               Closterium praelongum var. praelongum
                                             Closterium pritchardianum
                                             Closterium pronum
                                             Closterium pseudodianae
                                             Closterium pusillum
                                             Closterium ralfsii
                                               Closterium ralfsii var. gracilius
                                               Closterium ralfsii var. hybridum
                                               Closterium ralfsii var. immane
                                               Closterium ralfsii var. kriegeri
                                               Closterium ralfsii var. montanum
                                               Closterium ralfsii var. novae-angliae
                                               Closterium ralfsii var. ralfsii
                                             Closterium regulare
                                             Closterium rostratum
                                             Closterium seracerosum
                                             Closterium setaceum
                                               Closterium setaceum var. setaceum
                                               Closterium setaceum var. sigmoideum
                                               Closterium setaceum var. vittatum
                                             Closterium spetsbergense
                                               Closterium spetsbergense var. longius
                                               Closterium spetsbergense var. spetsbergense
                                               Closterium spetsbergense var. subspetsbergense
                                             Closterium strigosum
                                               Closterium strigosum var. elegans
                                               Closterium strigosum var. strigosum
                                             Closterium striolatum
                                               Closterium striolatum var. erectum
                                               Closterium striolatum var. intermedium
                                               Closterium striolatum var. striolatum
                                               Closterium striolatum var. subtruncatum
                                             Closterium subangulatum
                                             Closterium subcostatum
                                             Closterium sublaterale
                                             Closterium sublatum
                                             Closterium toxon
                                             Closterium tumidulum
                                             Closterium tumidum
                                               Closterium tumidum var. nylandicum
                                               Closterium tumidum var. sphaerosporum
                                               Closterium tumidum var. tumidum
                                             Closterium turgidum
                                               Closterium turgidum var. giganteum
                                               Closterium turgidum var. turgidum
                                             Closterium ulna
                                               Closterium ulna var. recurvatum
                                               Closterium ulna var. ulna
                                             Closterium venus
                                               Closterium venus var. appollonionis
                                               Closterium venus var. crassum
                                               Closterium venus var. incurvum
                                               Closterium venus var. minus
                                               Closterium venus var. venus
                                               Closterium venus var. westii
                                     Penium
                                             Penium clevei
                                             Penium closterioides
                                             Penium costatum
                                             Penium cruciferum
                                             Penium cucurbitinum
                                               Penium cucurbitinum var. minor
                                             Penium curtum
                                               Penium curtum var. minor
                                             Penium cylindrus
                                               Penium cylindrus var. cylindrus
                                               Penium cylindrus var. subtruncatum
                                             Penium didymocarpum
                                             Penium exiguum
                                             Penium inconspicuum
                                             Penium libellula
                                             Penium margaritaceum
                                               Penium margaritaceum var. elongatum
                                               Penium margaritaceum var. margaritaceum
                                             Penium minutum
                                             Penium oblongum
                                             Penium phymatosporum
                                             Penium polymorphum
                                             Penium rufescens
                                             Penium rupestre
                                             Penium silvaenigrae
                                               Penium silvaenigrae var. parallelum
                                               Penium silvaenigrae var. silvaenigrae
                                             Penium spinospermum
                                             Penium spinulosum
                                                   [Pleurotaenium spinulosum]
                                             Penium spirostriolatum
                                     Spinoclosterium
                                             Spinoclosterium curvatum
                                             Spinoclosterium cuspidatum