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| Description: Fern with perennial thick, creeping rhizome, up to 1 m long with reddish trichomes, very fine and characteristic, up to 6 cm long. Fronds 10-15, arranged in loose clump of up to 320 cm length. Strong, long at the base and deeply furrowed petiole. Relationship total length of frond / petiole length of between 2.20 and 4.20 in adult fronds. Triangular sheet 4 to 5 times pinnate, malacophilus, glossy, dark-green by the beam, a little clearer by side, with a basal width of up to 90 cm. Segments last order oblong-lanceolate, icise, lobed margin. Veins free. Marginal, terminal sores in the veins of 1.5 to 3 mm elipsoideus somewhat bulky, reniform with paraphysis and inside a receptacle formed by the epivalve (extension of the sheet) covering the hipovalve ( real indusium). Sporangiums with basípetal maturation. Slightly oblíque rings. Pluricellular, linear or zigzag paraphise. Tilete, tetraedrical-globous, yellowish spores, 45-52 µ m in diameter. N = 66, 68. Culcita C. Presl., unique genre of the family Culcitaceae, includes 10 species that are grouped into 2 subgenera, the typical Culcita, formed by a kind of tropical American C. Coniifolia (Hooker) Maxon and another, C. Macrocarpa, which appears in the macaronesian islands and comes from a residual form to the European continent and the Asian and Oceanian subgenus Calochlaena, , with 8 species. Some authors include this genus in the family Dicksoniaceae. |
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Distribution: Paleomediterranean relictus distributed by the Macaronesian islands (Canaries, Azores and Madeira) and punctually in the mountains of Algeciras (Cadiz) and northwest of the Iberian Peninsula (Spain and Portugal). We have located 11 dispersed populations. The number of individuals in most populations, ranging between 2 and 50 individuals. One of the introduced populations had around 300 individuals. It has been estimated the structure of the age depending on the length of the rhizome, according to which 1 / 3 of individuals in the studied populations belong to older individuals, 1 / 3 for adults and 1 / 3 to juvenile ones. |
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Category IUCN: NE
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