B. Papp szerk.: Studia Botanica Hungarica 34. 2003 (Budapest, 2003)

Buczkó, Krisztina: Diadesmis brekkaensoides (W. Bock) Moser, Lange-Bertalot et Metzeltin: a new aerophytic diatom for the Hungarian flora

RESULTS A dense population of Diadesmis brekkaensoides (W. Bock) Moser, LangeBertalot et Metzeltin was found in the sample collected at 10 m depths on the eastern wall of the shaft (Figs 2-4). At the sampling point higher than 6.5 m only one specimen was found and the species was absent at from 16-18 m downwards. In the Kiskőhát shaft several other typical aerophytic diatoms were found including Hantzschia amphioxys (Ehr.) Grun., Ortoseira roseana (Rabenh.) O'Meara, Diadesmis contenta (Grun.) Mann, Luticola nivalis (Ehr.) Mann, Nitzschia palea (Kütz.) W. Smith, Diadesmisperpusilla (Grun.) Mann, Pinnularia borealis Ehr. DISCUSSION Diadesmis brekkaensoides was described in 1963 as Navicula brekkaensoides (BOCK 1963). The population found in the Kiskőhát shaft corresponds to Bock's description: "Valves linear in girdle view, central area compressed, the ends are wedge forming. Valves linear, with triundulate margins. Apices protracted and later rounded, 17-23 pm long, 4-5 pm wide. Raphe straight with terminal nodule. Axial area narrow, linear, central area large, circular. Striae radiate in the middle part, beFig. 1. The location of Kiskőhát shaft in Hungary.