Hapalosiphon santannae Lemes da Silva, Zanini & Necchi ex Molinari & Guiry, 2021

Molinari-Novoa, Eduardo A., 2021, Nomenclatural notes on algae. V. New names for various algal taxa, mostly at the species rank, Notulae Algarum 184, pp. 1-17 : 6

Hapalosiphon santannae Lemes da Silva, Zanini & Necchi ex Molinari & Guiry , sp. nov.

Replaced designation: “ Hapalosiphon santannae Lemes da Silva, Zanini & Necchi ”, Acta Botanica Brasiliensis 24: 920, 2010 (Cyanobacteria, Hapalosiphonaceae ), nom. inval.

Diagnosis: Most similar to Hapalosiphon fontinalis Bornet , but with cells longer than wide and being found in aerophytic rather than aquatic habitats.

Description: Tangled filaments forming caespitose mats. Lateral branches of dissimilar length, (12.0-)14.0-16.0 μm diam., similar to the primary filament. Sheath yellow. Cells 8.0-12.0 μm wide, 4.8-9.6 μm long. Heterocytes intercalary or lateral, (8.0-)10.0-12.0 μm long. Aerophytic.

Iconography: Lemes da Silva & al. (2010: 922, fig. 2 E-F), Lemes da Silva & al. (2012: 172, fig. 11).

Type: Brasil: São Paulo: Planalto (21.00139 S, 49.97388W); 26 April 2007, Lemes da Silva s. n., ( SJRP 28275 ) .

Notes: The intended publication of the species ( Lemes da Silva & al. 2010) did not include a type designation, rendering the nomenclatural act invalid (Art. 40.1). A later article ( Lemes da Silva & al. 2012) included a new description, direct references to the previously published protologue, a new photograph of the alga showing its differential characteristics and cited a voucher specimen, but did not explicitly designate it as the type, as it is required by Art. 40.6. The epithet honours the Brazilian phycologist Célia Romano Leite Sant’Anna (Universidad de São Paulo).