Figure 10. Compression of Cyclosorus pinnate leaf and compressions and impressions of Blechnum pinnae, sporangia and spores from Late Oligocene volcaniclastic strata in the Margargaria River localities, northwestern Ethiopian Plateau. 10.1 Detail of Cyclosorus pinnate leaf fragment showing a characteristic pinnate venation pattern. Note the first pair of secondary veins of adjacent pinnules fused into a single common vein that is arranged perpendicular to the costa and that is joined at its upper limit by the following pair of secondary veins of each pinnule. CH-79-234B. Scale bar equals 0.5 cm. 10.2 Dispersed linear lanceolate Blechnum pinnae fragments. CH-93-90. Scale bar equals 0.5 cm. 10.3 Fertile Blechnum pinnae fragment showing two rows of sporangia, arranged on a comissure along each side of the costa. CH-87-8. Scale bar equals 0.1 cm. 10.4 SEM of stalked sporangia in-situ on Blechnum pinnae. Oblique white bar in picture indicates sporangium stalk. CH-87-8. Scale bar equals 50 µm. 10.5 SEM of Blechnum stalked sporangia with in-situ monolete spores. CH-87-8. Scale bar equals 25 µm. 10.6 Detail of Blechnum pinnae fragment showing typical dichotomous venation. Note that secondary veins bifurcate once or twice. CH-93-70. Scale bar equals 0.1 cm. 10.7 Detail of Blechnum pinnae fragment showing dentate margin. CH-93-70. Scale bar equals 250 µm.