Underside of the leaf of the giant Amazon water lily. This particular specimen is a hybrid of Victoria amazonica and V. cruziana, and set a world record with its leaf — 2.65m (8’ 6½’’) across!
The fact that the fern prothallium resembles a heart has not gone unnoticed:
“Nineteen Species of Fern Named for Lady Gaga”
“At one stage of its life, the new genus Gaga has somewhat fluid definitions of gender and bears a striking resemblance to one of Gaga’s famous costumes. Members of the new genus also bear a distinct DNA sequence spelling GAGA.”
”Gaga, a New Fern Genus Segregated from Cheilanthes (Pteridaceae),” Fay-Wei Li, Kathleen M. Pryer and Michael D. Windham. Systematic Botany, Oct-Dec, 2012.
Prothallium (prothallus) — the gametophyte of the wood fern genus Aspidium
“The vast majority of these illustration plates are from a plant systematics wall chart series – the Dodel-Port Atlas – released between 1878 & 1883”