Like C. cumingii in asymmetry of the pinnae, but larger; pinnules to 200 by 25 mm; sori one or two pairs to each lamina-segment; many appressed antrorse hairs on lower surface of costae, some of them rigid and usually reddish but never spreading; pale flaccid hairs also on costules and veins, and often on the surface of the lamina between veins.
On Mt Kinabalu abundant in secondary forest at c. 1000 m, on steep slopes which are periodically cleared by burning for cultivation, apparently surviving the burning; fronds were reported as up to 4 or 5 m in total height. Sumatran specimens were found at 1200-2000 m.
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