Ulva labyrinthiformis Linnaeus, Species Plantarum, ed. 2, 2: 1633. 1763.

"Habitat in Thermis Patavinis gradu caloris 49, pulchre arei incisa cum descriptione a Vandellio." RCN: 8371.

Lectotype (Pentecost in Spencer & al. in Taxon, in press): [icon] " Ulva thermalis valvulosa, erecta simplex, capitulo subrotundo " in Vandelli, Tract. Therm. Agri Patav.: 215, t. 2. 1761.

Current name: Spirulina labyrinthiformis Gomont ( Spirulinaceae).

Note: Specific epithet spelled “labyrintiformis” in the protologue.

This name relates to a member of the algae that has a post-1753 Starting Point ( Nostocaceae Homocysteae - Art. 13.1 (e) and which therefore has no nomenclatural standing (see Spencer & al. (in Taxon, in press).