B. Papp szerk.: Studia Botanica Hungarica 30-31. 1999-2000 (Budapest, 2000)

Rákosi, László; Barbacka, Mária: Upper Cretaceous flora from Ajka (W Hungary). I. Thallophyta

Infraturma: Murornati Genus: Horstisporit.es Potonié 1956 Generotype: Horstisporites (al. Triletes) reticuliferus (Dijkstra 1951) Potonié 1956 Horstisporites harrisii (Murray 1939) Potonié 1956 Figs 9-15 Description: Trilete megaspore, circular to subcircular, 500-600 urn in diameter. The surface is muricate (Figs 10-11). Remarks: The surface is well comparable to H. harrisii illustrated by BERGAD (1978, PI. 3, Fig. 5). In SEM the differentiation into perine and exosporium is well visible. In the examined material from Ajka only few samples of H. harrisii were found in borehole Kf-2, from 805.0 and 800.7 m. Genus: Erlansonisporites Potonié 1956 Generotype: Erlansonisporites (al. Selaginellit.es) erlansonii (Miner 1932) Potonié 1956 Erlansonisporites spinosus Bergad 1978 Figs 16-18 Description: Trilete megaspore, outline circular, trilete mark often completely covered by strong reticulations thus being partially visible or invisible. Diameter 350-500 urn. Remark: Up to now only few samples were found in Maastrichtian levels. Turma: Vestitriletes Subturma: Perinotriletes Genus: Dictyothylakos Horst 1954 Generotype: Dictyothylakos pesslarae Horst 1954 Dictyothylakos sp. Description: Brown in colour, fibre-shaped, reticulated fragments of different size. The lumen of a reticulum is about 4-15 um, the meshes of anastomosis 2-6 urn wide.