Spirogyra manormae Randhawa Spirogyra maravillosa Transeau Spirogyra marchica H.Krieger Spirogyra margalefii Aboal & Llimona Spirogyra margaritata Wollny Spirogyra marocana Gauthier-Lièvre Spirogyra maxima (Hassall) Wittrock Spirogyra megaspora Transeau Spirogyra meinningensis Spirogyra meridionalis W.J.Zhu & Zhong Spirogyra miamiana Taft Spirogyra microdictyon C.-C.Jao & Hu Spirogyra microgranulata C.-C.Jao Spirogyra micropunctata Transeau Spirogyra microspora C.-C.Jao Spirogyra mienningensis L.-C.Li Spirogyra minor (Schmidle) Transeau Spirogyra minuticrassoidea Yamagishi Spirogyra minutifossa C.-C.Jao Spirogyra mirabilis (Hassall) Kützing Spirogyra miranda Kadlubowska Spirogyra mirifica Zheng & Ling Spirogyra mithalaensis A.M.Verma & B.Kumari Spirogyra moebii Transeau Spirogyra monodiana Gauthier-Lièvre Spirogyra montserrati Margalef Spirogyra multiconjugata N.C.Ferrer & E.J.Cáceres Spirogyra multiformis Kadlubowska Spirogyra multistrata Zheng & Ling Spirogyra multitrata Zheng & Ling Spirogyra mutabilis C.-C.Jao & H.J.Hu Spirogyra narcissiana Transeau Spirogyra natchita Transeau Spirogyra nawaschinii Kasanowsky Spirogyra neglecta (Hassall) Kützing Spirogyra neorhizobranchialis C.-C.Jao & Zheng Spirogyra nitida (O.F.Müller) Leiblein Spirogyra nodifera O.Bock & W.Bock Spirogyra notabilis Taft Spirogyra nova-angliae Transeau Spirogyra novae-angliae Transeau Spirogyra nyctigama Taft Spirogyra oblata C.-C.Jao Spirogyra oblonga Liu Spirogyra obovata C.-C.Jao Spirogyra occidentalis (Transeau) Czurda Spirogyra oligocarpa C.-C.Jao Spirogyra olivascens Rabenhorst Spirogyra ollicola C.-C.Jao & Zhong Spirogyra oltmannsii Huber-Pestalozzi Spirogyra orientalis West & G.S.West Spirogyra orthospira Nägeli Spirogyra ouarsenica Gauthier-Lièvre Spirogyra oudhensis Randhawa Spirogyra ovigera Montagne Spirogyra pachyderma Gauthier-Lièvre Spirogyra palghatensis Erady Spirogyra paludosa Czurda Spirogyra papulata C.-C.Jao Spirogyra paradoxa Bhashyakarla Rao Spirogyra paraguayensis O.Borge Spirogyra parva (Hassall) Kützing Spirogyra parvispora H.C.Wood Spirogyra parvula (Transeau) Czurda Spirogyra pascheriana Czurda Spirogyra patliputri A.M.Verma & B.Kumari Spirogyra peipeingensis C.-C.Jao Spirogyra pellucida (Hassall) Kützing Spirogyra perforans Transeau Spirogyra plena (West & G.S.West) Czurda Spirogyra poljanskii Kadlubowska Spirogyra polymorpha Kirchner Spirogyra polytaeniata Strasburger Spirogyra porangabae Transeau Spirogyra porticalis (O.F.Müller) Dumortier- type Spirogyra pratensis Transeau Spirogyra princeps (Vaucher) Link ex Meyen Spirogyra proavita Langer Spirogyra prolifica Kamat Spirogyra propria Transeau Spirogyra protecta H.C.Wood Spirogyra pseudoaedaloides Kadlubowska Spirogyra pseudobellis W.J.Zhu & Zhong Spirogyra pseudocorrugata Gauthier-Lièvre Spirogyra pseudocylindrica Prescott Spirogyra pseudogibberosa Gauthier-Lièvre Spirogyra pseudogranulata S.-H.Ley Spirogyra pseudojuergensii H.Silva Spirogyra pseudomaiuscula Gauthier-Lièvre Spirogyra pseudomajuscula Gauthier-Lièvre Spirogyra pseudomaxima Kadlubowska Spirogyra pseudoneglecta Czurda Spirogyra pseudonodifera O.Bock & W.Bock Spirogyra pseudoplena Liu Spirogyra pseudopulchrata C.-C.Jao Spirogyra pseudoreticulata Kreiger Spirogyra pseudorhizopus L.J.Bi Spirogyra pseudosahnii Kadlubowska Spirogyra pseudospreeiana C.-C.Jao Spirogyra pseudosubreticulata Rickert & Hoshaw Spirogyra pseudotenuissima O.Bock & W.Bock Spirogyra pseudotetrapla Kadlubowska Spirogyra pseudotexensis Bourrelly Spirogyra pseudovarians Czurda Spirogyra pseudovenusta Liu & Wei Spirogyra pseudowoodii V.J.Poljanski Spirogyra pulchella (H.C.Wood) H.C.Wood Spirogyra pulchra Alexenko Spirogyra pulchrifigurata C.-C.Jao Spirogyra puncticulata C.-C.Jao Spirogyra punctulata C.-C.Jao Spirogyra quadrata (Hassall) P.Petit Spirogyra quadrilaminata C.-C.Jao Spirogyra quezelii Gauthier-Lièvre Spirogyra