Quillworts in a gnamma hole in Western Australia
A gnamma hole is a depression formed in granite or other very hard and inert rock that is formed from chemical weathering over millions of years, the name comes from noongar languages of the indigenous peoples of the southwest of Western Australia. Whilst restricted to tiny areas very distantly spaced, Quillworts are relatively easy to find in Western Australia, if you visit the right outcrops at the right time of year you will see them reliably every time.
It is not easy to identify a quillwort to a species in Western Australia without destructively collecting and dissecting a specimen as all the currently described species overlap significanty in morphology depending on growing conditions.
If you want to see a quillwort IRL and are willing to travel to Western Australia let me know because I can provide directions and coordinates or meet IRL because the extreme biodiversity in flowering plants here in SouthWest WA means the little quillworts get overlooked even by the most passionate of botanists.
This gnamma hole was in a ~1.5 billion year old granite bedrock outcropping in Cape Le Grande near Esperance https://www.inaturalist.org/observations/171702188