Fig. 6. Lithoporella minus Johnson, 1964 in Reproductive phases of Miocene algae from central Paratethys and their bearing on systematics

Fig. 6. Lithoporella minus Johnson, 1964 from early Serravallian, Rohožník, Slovakia, Vienna Basin. A. Bi/tetrasporophyte, NHM B1850/1 (thin section 5099). A1. Plant with encrusting growth form and conceptacles projecting above thallus surface. Thallus is entirely bi-stratose. A2. Palisade cells in primigenous filament developed in patches and non-palisade cells are present as well (arrow). A3. Arrow points to flattened not flared epithallial cell; note cell fusions in lower thallus. A4. Enlarged A1. Uniporate conceptacle with preserved pore canal cells (arrows). Cells are narrower and elongated. B. Gametangial-carposporangial plant, NHM B1850/2 (thin section 5099). B1. Projection of the conceptacle above thallus surface; arrow points to the single trichocyte at the side of the conceptacle. B2. Single trichocyte in distant portion of the thallus (black arrow); white arrow points to the palisade cells.