Abroteia orbicularis J.Agardh, 1876 accepted as Abroteia suborbicularis (Harvey) J.Agardh, 1878 (original description)
Aeodes nitidissima J.Agardh, 1876 (original description)
Callophyllis centrifuga J.Agardh, 1876 (original description)
Callophyllis decumbens J.Agardh, 1876 (original description)
Caloglossa mnioides Harvey ex J.Agardh, 1876 accepted as Caloglossa vieillardii (Kützing) Setchell, 1924 (original description)
Ceramium apiculatum J.Agardh, 1876 (original description)
Ceramium cliftonianum J.Agardh, 1876 (original description)
Ceramium rubrum f. corymbiferum J.Agardh, 1876 (original description)
Ceramium rubrum f. pedicellatum J.Agardh (original description)
Ceramium stichidiosum J.Agardh, 1876 (original description)
Cryptonemia latissima J.Agardh, 1876 (original description)
Cryptonemia obovata J.Agardh, 1876 (original description)
Ectophora depressa J.Agardh, 1876 (original description)
Epymenia halymenioides J.Agardh, 1876 accepted as Halopeltis cuneata (Harvey) G.W.Saunders, 2010 (original description)
Galaxaura elongata J.Agardh, 1876 accepted as Galaxaura rugosa (J.Ellis & Solander) J.V.Lamouroux, 1816 (original description)
Galaxaura lapidescens var. villosa J.Agardh, 1876 (original description)
Gelidium caulacantheum J.Agardh, 1876 (original description)
Gelidium longipes J.Agardh, 1876 (original description)
Gigartina angulata J.Agardh, 1876 (original description)
Gigartina clavifera J.Agardh, 1876 (original description)
Gigartina grandifida J.Agardh, 1876 (original description)
Gigartina laciniata J.Agardh, 1876 (original description)
Gigartina macrocarpa J.Agardh, 1876 (original description)
Gracilaria crassa Harvey ex J.Agardh, 1876 accepted as Gracilaria canaliculata Sonder, 1871 (original description)
Gracilaria crassa f. conglomerata Børgesen, 1952 (original description)
Gracilaria flagellifera J.Agardh, 1876 accepted as Crassa secundata (Harvey) Gurgel, J.N.Norris & Fredericq, 2018 accepted as Crassiphycus secundatus (Harvey) Gurgel, J.N.Norris & Fredericq, 2018 (original description)
Gracilaria ramulosa J.Agardh, 1876 accepted as Gracilaria cliftonii Withell, A.J.K.Millar & Kraft, 1994 (original description)
Grateloupia prolifera J.Agardh, 1876 (original description)
Grateloupia stipitata J.Agardh, 1876 (original description)
Griffithsia gunniana J.Agardh, 1876 (original description)
Kallymenia berggrenii J.Agardh, 1876 accepted as Psaromenia berggrenii (J.Agardh) D'Archino, W.A.Nelson & Zuccarello, 2010 (original description)
Kallymenia reniformis f. cuneata J.Agardh, 1876 (original description)
Laurencia ceylanica J.Agardh, 1876 accepted as Chondrophycus ceylanicus (J.Agardh) M.J.Wynne, Serio, Cormaci & G.Furnari, 2005 (original description)
Laurencia rigida J.Agardh, 1876 (original description)
Laurencia thyrsifera J.Agardh, 1876 (original description)
Microcoelia J.Agardh, 1876 accepted as Callophyllis Kützing, 1843 (original description)
Microcoelia chilensis J.Agardh, 1876 accepted as Salishia chilensis (J.Agardh) Clarkston & G.W.Saunders, 2012 (original description)
Nemastoma laciniatum J.Agardh, 1876 accepted as Tsengia laciniata (J.Agardh) D'Archino & Zuccarello, 2020 (original description)
Nitophyllum semicostatum J.Agardh, 1876 (original description)
Pachymenia dichotoma J.Agardh, 1876 (original description)
Pachymenia laciniata J.Agardh, 1876 (original description)
Phacelocarpus sessilis Harvey, 1876 (original description)
Plocamium dilatatum J.Agardh, 1876 (original description)
Plocamium hamatum J.Agardh, 1876 (original description)
Prionitis andersoniana Eaton ex J.Agardh, 1876 accepted as Prionitis sternbergii (C.Agardh) J.Agardh, 1851 (original description)
Ptilota filicina J.Agardh, 1876 (original description)
Schizymenia novae-zelandiae J.Agardh, 1876 (original description)
Spyridia breviarticulata J.Agardh, 1876 accepted as Spyridia filamentosa (Wulfen) Harvey, 1833 (original description)
Spyridia squalida J.Agardh, 1876 (original description)
Trichogloea lubrica J.Agardh, 1876 (original description)
Wrangelia ballioides J.Agardh, 1876 accepted as Wrangelia nobilis Hooker fil. & Harvey, 1847 (original description)
Wrangelia gunniana J.Agardh, 1876 accepted as Wrangelia plumosa Harvey, 1844 (original description)