Abstract:Pinna venation pattern and pinna anatomy of two species, S tangeria eriopus and Bowenia serrulata, represent atives of the two genera in Stangeriaceae were studied in this paper. The two sp ecies (genera) are similar in stomatal character and in the absence of accessory transfusion tissue, but they are very different in stomatal distribution, pinna venation pattern and pinna marginal shape, presence or absence of mucilage cana l, differentiation of palisade and spongy parenchyma, characteristics of girder parenchyma and epidermal anticlinal wal1． Pinna venation and pinna anatomy of Stangeriaceae are compared with those of Cycadaceae and Zamiaceae． Stevenson's classification (1992) with two subfamilies and the treatment of Stangeriaceae as a transitional evolutionary position between Cycadaceae and Zamiaceae is supposed by present study．
