Selliguea sri-ratu, a new species in Polypodiaceae

In a revision of the Malesian representatives of the genus Selliguea (Polypodiaceae) several recently collected specimens form Borneo were found to represent a very distinct, but hitherto undescribed species. From the few collections seen so far, it appears that the new species is not a very narrow endemic, and the fact that it has only been collected after 1970 probably is an indication of the increasingly intensive exploration of Borneo in recent times. In so far as the specimens had been identified, the names S. feei Bory and S. heterocarpa (Blume) Blume had been applied. In general habit, the species is closest to S. heterocarpa, but can be distinguished by the following characters: Selliguea heterocarpa — Rhizome 2-4 mm thick; rhizome scales peltate, 5-8.5 by 1-1.4 mm, straw-coloured to dull brown, with a thick, almost spongy pseudocosta, remotely and weakly dentate at base, entire towards the apex. Hydathodes frequent, margin without notches. Sori forming transversal coenosori, slightly to (usually) deeply sunken. Selliguea sri-ratu — Rhizome 4-8 mm thick; rhizome scales pseudopeltate, 7-13 by 1.2-2.5 mm, brown, without pseudocosta, strongly dentate. Hydathodes absent or infrequent, margin regularly notched. Sori round, elongated or sometimes confluent into a transversal coenosorus, superficial.