Species (118)
- Trabrooksia applanata H.W. Keller 1980
- Didymium laxifilum G. Lister & J. Ross 1943
- Didymium marineri G. Moreno, Illana & Heykoop 1989
- Didymium melanospermum (Pers.) T. Macbr. 1899
- Didymium megalosporum Berk. & M.A. Curtis 1873
- Didymium minus (Lister) Morgan 1894
- Didymium leptotrichum (Racib.) Massee 1892
- Didymium muscorum T.N. Lakh. & Mukerji 1976
- Didymium nigrum Krzemien. 1960
- Didymium obducens P. Karst. 1868
- Didymium nigripes (Link) Fr. 1818
- Didymium ovoideum Nann.-Bremek. 1958
- Didymium projectile T.N. Lakh. & Mukerji 1979
- Didymium pertusum Berk. 1836
- Didymium quitense (Pat.) Torrend. 1908
- Didymium serpula Fr. 1829
- Didymium squamulosum (Alb. & Schwein.) Fr. 1818
- Didymium tussilaginis (Berk. & Broome) Massee 1892
- Didymium vaccinum (Durieu & Mont.) Buchet 1920
- Didymium trachysporum G. Lister 1922
- Didymium sturgisii Hagelst. 1937
- Didymium vernum Kuhnt, K. Baumann & Nowontny 2014
- Didymium verrucosporum A.L. Welden 1954
- Didymium wilczekii Meyl. 1908
- Diderma lyallii (Massee) T. Macbr. 1899
- Diderma microcarpum Meyl. 1924
- Diderma montanum var. album (Torrend) G. Lister 1925
- Diderma nivale (Meyl.) Nowotny, H. Neubert & K. Baumann 1991
- Diderma ochraceum Hoffm. 1796
- Diderma niveum (Rostaf.) T. Macbr. 1899
- Diderma platycarpum Nann.-Bremek. 1966
- Diderma radiatum (L.) Morgan 1894
- Diderma rimosum Eliasson & Nann.-Bremek. 1983
- Diderma rufostriatum Nann.-Bremek. & Lado 1985
- Diderma simplex (J. Schröt.) G. Lister 1911
- Diderma spumarioides (Fr.) Fr. 1829
- Diderma subfloriforme Cand. & Nann.-Bremek. 1980
- Diderma subasteroides M.L. Farr. 1971
- Diderma rufum Nann.-Bremek. 1968
- Diderma subviridifuscum Buyck 1988
- Diderma umbilicatum Pers. 1801
- Diderma testaceum (Schrad.) Pers. 1801
- Diderma rugosum (Rex) T. Macbr. 1899
- Didymium crustaceum Fr. 1829
- Didymium dubium Rostaf. 1874
- Didymium flexuosum Yamash. 1936
- Didymium eximium Peck 1879
- Didymium iridis (Ditmar) Fr. 1829
- Didymium karstensii Nann.-Bremek. 1964
- Diderma alpinum Meyl. 1917
- Diderma carneum Nann.-Bremek. 1968
- Diderma chondrioderma (de Bary & Rostaf.) G. Lister 1925
- Diderma cinereum Morgan 1894
- Diderma cingulatum Nann.-Bremek. 1968
- Diderma cristatosporum A. Sánchez, G. Moreno & Illana 2002
- Diderma circumdissilens Flatau & Schirmer 2004
- Diderma floriforme (Bull.) Pers. 1794
- Diderma hemisphaericum (Bull.) Hornem. 1829
- Diderma lucidum Berk. & Broome 1861
- Diderma meyerae H. Singer, G. Moreno, Illana & A. Sánchez 2003
- Diderma roanense (Rex) T. Macbr. 1899
- Diderma sauteri (Rostaf.) T. Macbr. 1899
- Diderma trevelyani (Grev.) Fr. 1829
- Didymium macrospermum Rostaf. 1875
- Didymium nivicolum Meyl. 1921
- Didymium ochroideum G. Lister 1931
- Diderma deplanatum Fr. 1829
- Diderma crustaceum Peck 1873
- Diderma asteroides Lister 1911
- Diderma effusum (Schwein.) Morgan 1894
- Diderma donkii Nann.-Bremek. 1973
- Diderma globosum Pers. 1794
- Diderma evelinae (Meyl.) Kowalski 1975
- Diderma montanum (Meyl.) Meyl. 1921
- Didymium annulisporum H.W. Keller & Schokn. 1989
- Didymium anellus Morgan 1894
- Didymium bahiense Gottsb. 1968
- Didymium clavus (Alb. & Schwein.) Racib. 1844
- Didymium applanatum Nann.-Bremek. 1971
- Didymium crassicolle Ing 1982
- Didymium comatum (Lister) Nann.-Bremek. 1966
- Didymium decipiens Meyl. 1935
- Didymium difforme (Pers.) Gray 1821
- Didymium listeri Massee 1892
- Lepidoderma carestianum (Rabenh.) Rostaf. 1874
- Lepidoderma chailletii Rostaf. 1875
- Lepidoderma crustaceum Kowalski 1967
- Lepidoderma stipitatum Flatau 1984
- Lepidoderma crassipes Flatau, Massner & Schirmer 1987
- Lepidoderma tigrinum (Schrad.) Rostaf. 1873
- Lepidoderma peyerimhoffii Maire & Pinoy 1926
- Lepidoderma granuliferum (W. Phillips) R.E. Fr. 1906
- Lepidoderma didermoides Kowalski 1971
- Lepidoderma aggregatum Kowalski 1971
- Mucilago crustacea var. solida G. Lister ex Nann.-Bremek. 1975
- Mucilago spongiosa (Leyss.) Morgan 1897
- Mucilago crustacea F.H. Wigg. 1780
- Didymium farinaceum Schrad. 1797
- Physarum melanospermum Pers. 1794
- Didymium farinaceum var. minus Lister 1894