Abstract
The oldest cryptospores have great significance in studies of the evolution of land plants and may provide the earliest direct evidence of such organisms. A sporomorph assemblage of latest Ordovician age is described from marine deposits of the lower member of the Kalpintag Formation in Xinjiang, China. This assemblage comprises seven genera and eleven species of cryptospores (tetrads, pseudodyads, true dyads and monads). It has similarities to those described from coeval deposits from around world (such as Libya, the Czech Republic, southwestern Wales, the Welsh Borderland, etc.). These cryptospores provide further evidence for the existence of a homogeneous land-plant macroflora in the Late Ordovician.
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