Large Wavy Leaf Pyrrosia , P. lingua var tachyiba koryu is relatively easy to cultivate but slow growing. I have maintained this variety for many years and have never experienced any problems with its care. But, it is a slow grower compared to other lingua forms, but produces very large narrow fronds. At maturity, individual leaves can be 16 inches long and 1.5 inches wide. Their color is unusually dark though young fronds often are pale green until fully hardened. Occasionally some fronds show slight variegation though this usually disappears with age. The fronds are somewhat asymmetrical with no twisting of the blade but a very undulate margin and a wavy profile. It does produce fertile fronds with spores. I consider this variety to be uncommon in the trade and not easy to find.
