Paleozoic in Situ Spores and Pollen. Early Land Plants

Abstract The paper reports records of in situ spores of Paleozoic early land plants totalling 44 genera with 72 species (including four subspecies). Their reproductive organs yielded in situ spores belonging to 3 cryptospore species and 18 spore genera with 59 species. All descriptions of in situ spores have been modified employing current terminology for the description of Paleozoic spores. In situ spores of early plants are usually small, morphologically simple and can be divided into a few morphological groups. The most abundant spore genera are Apiculiretusispora , Retusotriletes and Ambitisporites .