Cyathea delgadii

Cyathea delgadii
Scientific classification
Kingdom:	Plantae
Division:	Pteridophyta
Class:	Pteridopsida
Order:	Cyatheales
Family:	Cyatheaceae
Genus:	Cyathea
Subgenus:	Cyathea
Section:	Cyathea
Species:	C. delgadii
Binomial name
Cyathea delgadii Pohl ex Sternberg, 1820 (republ. 1829)
Synonyms
Cyathea vestita Martius, 1822 Cyathea hirtula Martius, 1834 Cyathea oligocarpa Kunze, 1834 Cyathea schanschin Martius, 1834 Cyathea denticulata J. G. Goldmann in Meyen, 1843 (non Alsophila denticulata Baker, 1885; quae Cyathea hancockii) Cyathea abruptecaudata Fée, 1869 Cyathea feei Glaziou in Fée, 1869 Cyathea sphaerocarpa Fée, 1869 Cyathea pilosa Baker, 1874 Cyathea copelandii Kuhn & Luerssen in Copeland, 1882 Cyathea hypotricha Christ, 1904 Cyathea bahiensis Rosenstock, 1924 Cyathea micromera Rosenstock, 1924 Cyathea trindadensis Brade, 1936 Cyathea trinidadensis (Brade) J. E. Braggins & M. F. Large orth. var., 2004

Cyathea delgadii is a widespread species of tree fern native to Costa Rica, Panama, Venezuela, French Guiana, Guyana, Trinidad, Colombia, Ecuador, Peru, Bolivia, Argentina, Paraguay, and Brazil. It grows in tropical and submontane rain forest, forest understory, in open locations, and along paths, at an elevation of 100 m and above (up to 2700 m in Peru). The trunk of this plant is erect, 1.5-10 m tall and 5-15 cm in diameter. Fronds are bipinnate and 1.5-3 m in length. The crown is large and slightly arching. Petioles are yellow-brown to dark brown in colouration and bear spines. Small brown scales cover the rachis, which is also brown. Sori are borne on each side of the pinnule midvein and are protected by globose indusia.

C. delgadii forms part of a large complex centered on Cyathea fulva.

In Costa Rica, C. delgadii is present in the Cordillera de Guanacaste, Cordillera de Tilarán, north slope of the Cordillera Central, the Norte region, Caribbean side of the Cordillera de Talamanca, Fila Costeña, and the Osa Peninsula, where it has an altitudinal distribution of 500-1500 m (Alexander Rojas A., 1999).

Since it is abundant where it does grow and has such a large natural range, the conservation status of C. delgadii can be equated with the IUCN category "Lower risk" (Alexander Rojas A., 1999).

To do well in cultivation, plants should be provided with consistent moisture and well-drained humus as a substrate. This species does best when sheltered from the wind and grown in a warm area.

The specific epithet delgadii refers to Gancho do Generale Delgado, along the road to Caldas Novas, Brazil, where the type material was collected.

The roots of this species are used for the culture of orchids and the manufacture of crafts. C. delgadii may grow on disturbed land and, since it is often harvested from these areas, its use does not have as great an impact on the forest as it would otherwise.

References

• Braggins, John E. & Large, Mark F. 2004. Tree Ferns. Timber Press, Inc., p. 123. ISBN 0-88192-630-2
• The International Plant Names Index: Cyathea delgadii
• Alexander Rojas A. 1999. Especies de Costa Rica: Cyathea delgadii

External links

• Guimarães, Thais de Beauclair & Gil M. Felippe 1999. The survival and establishment potential of spores of Cyathea delgadii Sternb. in soils from Itirapina and Moji Guaçu (SP), Brazil. Rev. bras. Bot. 22(3).