Heterocapsa triquetra f. apiculata Er.Lindem.
Heterocapsa triquetra f. apiculata in Bot. Arch. 5: 116, fig. 11. 1 Jan 19241
Lectotype (designated by Gottschling, M., Tillmann, U., Kusber, W.-H., Elbrächter, M. & Hoppenrath, M. 20192): MediaSpecimen#2685 in : fig. 11