Paku tiang or pole fern or tiang fern ( Cyathea contaminans ) is a plant species in Cyatheaceae, has a height of up to 12 m, a single stem and the old part shows traces of leaves, the basal part is thickened by adventitious roots and grows mixed with other species. C. contaminans has stipe for 100 cm long, gloucous, purplish to the base, very thorny, when young has scales on all parts, up to 45x3 mm in size, pale brown, very thin and setiferous. The main rachis is pale, prickly, scaly as a stipe but then glabrescent. Pinnae has the largest size of 60 cm and the lowest decreases with stems up to 10 cm. Pinnules have a size of 150x30 mm or smaller with 1-2 pairs of basal segments more or not at all, the rest of the pine curved almost to the rib. Costules have a size of 4-5 mm. Common veins are 12 pairs. The lamina segment is hard, rough on the bottom and fibrous edges. Sori is exindusiate, near costule and pale paraphrase is no more than sporangia. The scales and hair on the pi...
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