Article: Leaf anatomy of Weichselia based on fusainized material
Charred leaf fragments preserved in siltstone show excellent internal structure by SEM. The anatomy presents a high degree of xeromorphism. A number of features, including sunken stomata with paired subsidiary cells, specialized cells of digitate form underlying the upper epidermis and abundant sclereids in the mesophyll, are probably unique among ferns. The significance of the anatomy is discussed in relation to the possible habitat.