Adiantum raddianum C. Presl.

Echeverría, María L., Alonso, Sara I. & Comparatore, Viviana M., 2017, Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina), Check List 13 (6), pp. 1003-1036 : 1015

Adiantum raddianum C. Presl.

Figure 5

Adiantum raddianum C. Presl (1836) : 158 — Cabrera (1968): 178; Flora

Argentina (2017); Tropicos (2017).

Adiantum cuneatum Langsdorff & Fischer (1810) : 23 — Capurro (1961):

121.

Cryptophyte, native with wide distribution in the American continent. Least Concern ( Delucchi 2006).

Characteristics. Delicate fern; rhizomes cylindrical, covered with brown-yellowish scales. Fronds triangular, pinnately compound, glabrous, with a thin, cylindrical, dark, almost black, glossy petiole. Pinnules alternate, irregular, almost rhombic; apex incised, with base cuneate, veins dichotomous; petioles long, thread-like. Sorus located on edge of pinnules.

Comments. This is a rare species in the study area. This fern grows in shady, humid sites. At the summit, it grows in deep cracks of rocks and also along the shaded banks of the stream. The major difference between A. raddianum and A. chilense Kaulfuss , which is also frequent in Buenos Aires mountains, is in the shape of the pinnules; the latter species presents reniform pinnules without cuneate bases and with the upper margin entire or with short incisions.

Subclass Magnoliidae

Superorder Lilianae

Order Asparagales : Family Amaryllidaceae : Tribe Gilliesiae