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

Family: Polypodiaceae Polypodiaceae gen. et sp. Description: Sporangium surrounded by the annulus with thick walls, but not forming a complete ring. The isolated spores are in two types, trilete and monolete, thus making a more exact determination impossible. Remark: Very common type of sporangium in Hungarian deposits. Family: Adiantaceae Genus: Acrostichum Linné 1753 Acrostichum sp. Figs 61, 63 The genus is represented by the opened sporangium with annulus spores. Its size is about 500 pm. The spores are trilete, ornamented with granules. The material is very close to the spores A. anglicum described by Collinson from the Great Britain (COLLINSON 1978, p. 243, PI. 2, Fig. H). Remark: One specimen vas collected in the borehole Gy-12, from 535.6 m. Order: Marsileales Family: Marsileaceae Genus: Lobasporites Floquet et Lachkar 1979 Generotype: Lobasporites lobatus (Dijkstra 1949) Floquet et Lachkarl 979 Lobasporites lobatus (Dijkstra 1949) Floquet et Lachkar 1979 Figs 26-29 Description: Spheroidal megaspore, 200-600 pm in diameter. The exine is granulöse, in high magnification 1-2 pm large gemmae are visible (Figs 27-28). Remarks: According to HALL (1967, 1974) and ELLIS and TSCHUDY (1964) this genus belongs to the family Marsileaceae. Many authors have not accepted the genus Lobasporites. Up to now, the following taxa belong to the genus Molaspora: M. fibrosa, M. hallii, M. reticulata, M. salium (KOVACK and BATTEN 1989).