Monographs Details: Adiantum petiolatum Desv.
Authority: Proctor, George R. 1989. Ferns of Puerto Rico and the Virgin Islands. Mem. New York Bot. Gard. 53: 1-389.
Description:Species Description - Rhizome short-creeping, 3-7 mm thick, bearing
at apex a dense tuft of lustrous, light brown,
subclathrate, narrowly lance-attenuate scales
mostly 2-3 mm long, these entire or rarely denticulate
near base. Fronds very closely distichous,
erect or ascending, 25-60 cm long; stipes
shining black, slender, glabrous, 10-40 cm long,
equalling to much exceeding length of blade.
Blades oblong to deltate-oblong, 15-25 cm long,
6-12 cm broad; rhachis like the stipe; pinnae 4-
12 pairs and a terminal one, altemate, simple
(rarely the basal ones pinnate), inequilateral, the
lower ones stalked (stalks 1-5 mm long), lancedeltate,
broadly rounded at acroscopic base and often overlying rhachis, deeply excavate on
basiscopic side; middle and distal pinnae oblonglanceolate, long-acuminate (or sterile ones obtuse to somewhat acute); veins obliquely ffabellate
from the slender median costa; tissue thinly
papery, very glaucous abaxially. Sori several to
many along both longest margins, linear, arcuate,
and adjacent; indusioid flap brown, minutely fimbriate.
Type. From "Gallia aequinoctiali Brasiliaque"
(specimen so far not located among Desvaux's
material at Paris).
Syn. Adiantum obliquum of Kaulfuss, Enum. filic. 200.
1824, not Willdenow in Linnaeus, 1810.
Adiantum kaulfussii Kunze, Linnaea 21: 221.
1848; Grisebach, FL. Brit. W.I. 663. 1864. (Lectotype.
Kohaut, from Martinique, Sieber, Fl. Martin. 371, B.)
Adiantum denticulatum of Krug, Bot, Jahrb, Syst.
24: 92. 1897, not Swartz, 1788.
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