Phước Tuy was a province of the former South Vietnam.
It now mostly corresponds to Bà Rịa–Vũng Tàu province, just southeast of Ho Chi Minh City in reunified Vietnam.
During the Vietnam War it was the main region of operations for the 1st Australian Task Force.
1 ATF was based in a rubber plantation at Nui Dat, about 8 kilometers north of Ba Ria.
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction