FIGURES 20–26 in Systematics of araphid diatoms with asymmetric rimoportulae or densely packed virgae, with particular attention to Hyalosynedra (Ulnariaceae, Bacillariophyta)

FIGURES 20–26. Hyalosynedra sublaevigata from HK512, Puerto Rico. 20. LM of specimen with somewhat protracted or weakly concave margin before capitate end. 21. LM of specimen with margin concave to capitate end. 22. SEM of specimen with margins near linear from center to end. 23. SEM detail of apex. 24. SEM detail of broad central area of lanceolate sternum. 25. SEM interior of entire valve. 26. SEM detail of interior of apex showing asymmetrical rimoportula.