The vegetative anatomy of Polystrata alba (PFENDER) DENIZOT has important analogies with the anatomical structures of the non-geniculate corallines. The thallus is organized in a bilateral-radial manner and consists of a single eccentric row of primigenous filaments composed of tall cells. Postigenous filaments arise plumosely both upward and downward from the outer surface of the primigenous filaments; the dorsal ones bend progressively upward to become perpendicular to the surface of the thallus. During the Upper Eocene, P. alba (PFENDER) DENIZOT developed on the uppermost outer and mid-ramp of the western margin of the Lessini Shelf (Nago; southern Alps), growing either as crusts or rhodoliths, in association with non-geniculate corallines.
Vegetative anatomy and palaeoecology of Polystrata alba (PFENDER) DENIZOT, 1968 (Cryptonemiales, Peyssonneliaceae) from the upper Eocene of northern Italy
BASSI, Davide
1997
Abstract
The vegetative anatomy of Polystrata alba (PFENDER) DENIZOT has important analogies with the anatomical structures of the non-geniculate corallines. The thallus is organized in a bilateral-radial manner and consists of a single eccentric row of primigenous filaments composed of tall cells. Postigenous filaments arise plumosely both upward and downward from the outer surface of the primigenous filaments; the dorsal ones bend progressively upward to become perpendicular to the surface of the thallus. During the Upper Eocene, P. alba (PFENDER) DENIZOT developed on the uppermost outer and mid-ramp of the western margin of the Lessini Shelf (Nago; southern Alps), growing either as crusts or rhodoliths, in association with non-geniculate corallines.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
