Monographs Details: Adiantum obliquum Willd.
Authority: Maguire, Bassett. 1972. The botany of the Guayana Highland--part IX. Mem. New York Bot. Gard. 23: 1-832.
Family:Pteridaceae
Scientific Name:Adiantum obliquum Willd.
Description:Distribution and Ecology - Distribution. Tropical Central and South America. Terrestrial. In the Guayana Highland known only from Soratama, between the Río Pacoa and the Río Kananarí, Prov. Amazonas or Prov. Vaupés, Colombia, alt ca 250 m, Schultes & Cabrera 13691 (US).

Discussion:

Adiantum macropus Schrad., Gott. Gel. Anz. 1824: 872. 1824. Type. Brazil, Prince Maxmillian von Neowidens (M not seen).

Adiantum macrodus Kaulf. ex Kunze, Flora 22(Beibl.): 42. 1839. Type. Sieber, Fl. Mixt. 338, which is also the basis of Kaulfuss’ name.

Adiantum obliquum var ß majus Hook., Sp. Fil. 2: 8, pl. 79A, f. 1. 1851. Syntypes. Colombia, Cuming 1202; Montagne de Mahurie, French Guiana, LePrieur; Tanaii, near Para, Brazil, Spruce 39; Guadeloupe, L’Herminier (presumably all K none seen).

Adiantum obliquum var acuminatum Karst., FI. Col. 1: pl. 92. 1861. Type. “Andes Bogotenses prope pagum Muzo,” Colombia, Karsten (W not seen).

Adiantum platyphyllum var obliquum (Willd.) Baker in Mart., FI. Bras. 1(2): 364. 1870. Adiantum obliquum var bipinnatum Christ, Bull. Herb. Boiss. II, 4: 1094. 1904. Type. Costa Rica, Werckle (P not seen).

Adiantum obliquum var macrodon (Kaulf. ex Kunze) Hieron., Hedwigia 48: 232. 1909.

Lectotype. A note by Maxon in the U. S. National Herbarium reports that the second syntype, Caracas, Venezuela, Bredemeyer (B-Hb. Willd. no. 20067-1 not seen Tryon photo US) “is a fine, nearly complete frond in excellent condition and should be regarded as the actual type.” I choose this specimen as lectotype. The first syntype, Porto Rico, Ventenat, (B-Hb. Willd. no. 20067-2 not seen Tryon photo US), according to Maxon “is small, old, broken, and incomplete, but originally fertile. Hieronymus refers it to A. petiolatum, but it is probably a form of obliquum as that species is commonly understood.” I find it impossible to place the photograph with certainty in either species.

Distribution:Guyana South America| Colombia South America|