Abstract
After the revision of New Guinean material of tree ferns (Cyatheaceae, Dicksoniaceae) stored at the Royal Botanic Gardens Kew, we describe the following ten species of scaly tree ferns (Cyatheaceae) as new to science: Alsophila calcicola, A. excelsior, A. indiscriminata, A. johnsii, A. nebulosa, A. novabritannica, A. parrisiae, A. sundueana and A. telefominensis. All are species of the forest understory and have erect trunks 1 – 4 m tall. Sphaeropteris kessleri is the first species of the Sarcopholis clade of Sphaeropteris with only pinnate-pinnatifid fertile fronds and without a trunk. Five new combinations are made for Malesian Cyatheaceae (Alsophila albidosquamata; A. brachyphylla; A. exilis, A. nothofagorum, Sphaeropteris mesosora) and lectotypes are chosen for A. buruensis, A. concinna, A. polyphlebia and A. rumphiana (all synonyms of S. felina) and S. ledermannii.
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