Fig. 4 in Middle Triassic dipterid ferns from west-central Argentina and their relationship to palaeoclimatic changes

Fig. 4. Dipterid fern Dictyophyllum menendezi sp. nov. from Cortaderita Formation (Ladinian, Middle Triassic) of Barreal-Calingasta, San Juan Province, Argentina. A. PBSJ 832, general view of the frond (A1), details of secondary and tertiary veins, and areoles (A2, A3, A4). B. PBSJ 833. C. PBSJ 840. D. PBSJ 836. E. PBSJ 843, sample with apical part of petiole preserved (arrow). Scale bars: A1, D, 20 mm; B, C, E, 10 mm; A2, A3, A4, 5 mm.