An autonomous oblast is an autonomous entity within the state which is on the oblast (province) level of the overall administrative subdivision.
There were autonomous oblasts of the Soviet Union and later some federal subjects of Russia were autonomous oblasts: the one remaining is the Jewish Autonomous Oblast. Eastern Rumelia was an autonomous province (oblast in Bulgarian, one of its official languages) of the Ottoman Empire. Serb Autonomous Regions are known as oblasts.
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