Observations on Neomeris cretacea var. undulata RAINERI followed by Dissocladella bonardii, n. sp. (Dasycladales, green algae)

Dissocladella undulata (RAINERI, 1922) PIA, 1936 was established on the basis of heterogeneous specimens originating from the Upper Cretaceous of Libya. The species is quite commonly found elsewhere in North Africa and the Middle East. New material collected in Libya is compared with the type specimens and to Miss R. RAINERIʼs original protologue. A significant feature, the undulation, is clearly of secondary origin. It is present in the herein designated lectotype of the species, which probably belongs to the genus Trinocladus. The resulting incongruity was unfortunately overlooked by J. PIA in his partial review of Miss R. RAINERIʼs material, made in 1936. A new species, Dissocladella bonardii, is introduced for the genuine specimens of Dissocladella, in replacement of D. undulata, now obsolete.