Chingia longissima (Brack.) Holtt.

Chingia longissima is a large fern in the family Thelypteridaceae. It occurs on South Pacific Islands that have some elevation, and is uncommon on most of the islands where it has been found. It has pinnate-pinnatifid fronds, like many other Thelypteridaceae [i.e., the fronds are pinnate and the pinnae themselves are deeply pinnatifid], but is distinctive because of the very long and abundant scales that stick out at right angles to the stalk of the frond. It is also noteworthy because the upright rhizome emerges from the ground to form a small trunk in mature specimens. This, combined with fronds that can be two meters or more long including the stalk, make large plants of this species resemble a small tree fern, although it is in the family Thelypteridaceae and not in the true tree fern family (Cyatheaceae). It seems to grow mostly in slightly open, perhaps disturbed spots on ridges and sloping ground in otherwise well-preserved native habitat above 1000 metres or so in elevation. In French Polynesia, it occurs at least on the islands of Tahiti, Moorea and Bora Bora. In Fiji, it has been collected from Viti Levu (on Tomaniivi, also known as Mount Victoria) and on Taveuni.

Chingia longissima là một loài dương xỉ trong họ Thelypteridaceae. Loài này được Holttum mô tả khoa học đầu tiên năm 1974. Danh pháp khoa học của loài này chưa được làm sáng tỏ.