Silva Center for Phycological Documentation: Index Nominum Algarum

The INA is a card file and online reporting system maintained at the Silva Center for Phycological Documentation of the University Herbarium, University of California, Berkeley. It contains nearly 200,000 names of algae (in the broad sense). The BPU is a card file containing bibliographic references pertaining to algal taxonomy.
A working list of algal type specimens at UC is available here

Results from INA database

HYDROCOCCUS(Kützing) Elenkin image
HYDROCOCCUSF.T. Kützing image
Hydrococcus brebissonii(Meneghini) Kützing image
Hydrococcus cesatiiCesati image
Hydrococcus cesatiiRabenhorst Alg. Sachs.: Dec. 93/94: 922 1860
Hydrococcus ericetorumKützing image
Hydrococcus guadelupensisCrouan fr. image
Hydrococcus lacustrisBrügger image
Hydrococcus marinusCrouan frat. image
Hydrococcus marinusGrunow image
Hydrococcus opertusMargalef image
Hydrococcus pisiformis(Hudson) Link image
Hydrococcus pruniformis(L.) Link image
Hydrococcus rivularisKützing Linnaea 8: 380 1833
Hydrococcus rivularisKützing image
Hydrococcus ulvaceusKützing image
PALAEOHYDROCOCCUSP.K. Misra & P.K. Maithy Palaeobotanist 32: 122 1984
Palaeohydrococcus raoiP.K. Misra & P.K. Maithy Palaeobotanist 32: 122, fig. 1C, pl. 1: figs. 4-7 1984