This name is a synonym of Aster fastigiatus Fisch..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 6753B110-FD95-42D8-9706-FDF3AF6FF1D2).
This name record (from TICA) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Aster micranthus in version 1 of The Plant List.