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Monograph of the West Indian fern genus Polystichopsis (Dryopteridaceae)
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Monograph of the West Indian fern genus Polystichopsis (Dryopteridaceae)
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Journal Article
Monograph of the West Indian fern genus Polystichopsis (Dryopteridaceae)
2016
Overview
Keys, full synonymy, descriptions, specimens examined, and illustrations are provided for the fern genus Polystichopsis. The genus occurs in the West Indies, with disjunct populations in Nicaragua and Isla Margarita, Venezuela. Seven species and one hybrid are recognized. The genus can be distinguished from other dryopteroid genera by the combination of creeping rhizomes, distichous leaves, lack of scales on the mature leaves, and straight, whitish multicellular hairs on the leaves. Although the genus has creeping rhizomes, it does not climb as do many other closely related dryopteroid genera. A new species, P. puberula, and new hybrid, P. × sanchezii (=P. chaerophylloides × P. pubescens), are described. Lectotypes are designated for Nephrodium pubescens var. breviculum, P. leucochaete, and P. muscosa. A list is provided of 28 names excluded from Polystichopsis, and another list is provided for accepted names and their synonyms that apply in the genus. Claves, sinonimia completa, descripciones, ejemplares examinados e ilustraciones se suministra para el género de helechos Polystichopsis. El mismo existe en las Antillas con poblaciones disyuntas en Nicaragua y la Isla Margarita, Venezuela. Se reconocen siete especies y un híbrido. El género se distingue de otros géneros dryopteroides por la combinación de rizomas reptantes, hojas dísticas, ausencia de escamas en las hojas maduras y pelos blanquecinos en las hojas. Aunque posee rizomas rastreros, no es trepador como muchos otros géneros driopteroides relacionados. Se describe una especie nueva, P. puberula, y un híbrido nuevo, P. × sanchezii (=P. chaerophylloides × P. pubescens). Se designan lectotipos para Nephrodium pubescens var. breviculum, P. leucochaete y P. muscosa. Se brinda una lista de 28 nombres excluidos de Polystichopsis, y otra lista para los nombres y sus sinónimos que se aplican en el género.
Publisher
The New York Botanical Garden Press,Springer US
Subject
