DOS 4 or DOS-4 may refer to:
- The Soviet space station Salyut 4
Versions of the IBM PC DOS family:
- IBM DOS 3.40, announced successor of IBM DOS 3.30 in 1988
- IBM DOS 4.00, released successor of IBM DOS 3.40 in 1988
- IBM DOS 4.01, a bug-fix release at the end of the same year
- IBM DOS 4.02, a ROMed version of DOS in IBM PS/1 machines
Versions of the Microsoft MS-DOS family:
- MS-DOS 4.0 (multitasking), a multitasking version in 1986/1987 by Microsoft
- MS-DOS 4.1 (multitasking), a multitasking version for the ICL DRS PWS in 1987
- MS-DOS 3.40, announced successor of MS-DOS 3.31 in 1988
- MS-DOS 4.00 (IBM-developed), successor to MS-DOS 3.31 in 1988
- MS-DOS 4.01, a bug-fix release in 1988
- Russian MS-DOS 4.01, a special Russian version of MS-DOS 4.01 (RDOS) in 1990
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