Sceptridium decompositum (M.Martens & Galeotti) Lyon
Descripción
Buds hairy; leaf sheaths closed; fronds 15–50 cm long; sterile blades 5–15 X 7–22 cm, deltate to pentagonal, ternately compound; pinnae other than the basal pair pinnate to bipinnatepinnatifid, tips elongate; segments acute, ovate, often divided to main vein, terminal segments ovate to lanceolate, usually pointed, apices cut only shallowly or not at all, irregularly serrulate, usually considerably larger than other segments; leaf tissue fleshy or thick-herbaceous, glabrous or with few scattered hairs; sporophores arising from the common stalk at or just below the ground surface and far exceeding the sterile blades in height, commonly absent.A
Forma de vida
TerrestreA
Ejemplar revisado
(Related to the synonym Botrychium decompositum) Chis (Breedlove 31940, DS, F, NY). Hgo (Pringle 8922, UC). Méx (Hinton 1850, MEXU). Mich (Díaz Barriga 2265, IEB). NL (Rodríguez L. 48, ASU). Oax (Mickel 7253, NY). Pue (Sharp 441189, US). Qro (Guzman 214, UAMIZ). Tam (Reznicek 8423, CHAPA, MICH). Ver (Taylor & Nee 296, NY).A
Elevación
900 – 2800 mA
Ecología y Hábitat
Grassy areas or open forests.A
Tipo de vegetación
Bosque de neblina/mesófilo, Bosque de pino-encinoB
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
(In relation to the synonym Botrychium decompositum) The name “B. decompositum” has been used for a complex related to B. dissectum Spreng. of United States, Canada, and Greater Antilles. There are several variations that might, with further study, prove to be distinct species. Unfortunately, the distinguishing characters are few and their variation too great to enable us to describe them with confidence at this time. There are three major variants that seem to run together.
Botrychium decompositum in the strict sense has very coarse segmentation with blunt-tipped pinnules and pinnae. The degree of margin toothing/denticulation is quite variable (Pringle 15706, F, GH, UC, from Hidalgo).
A second form has pinnules and segments strongly ascending and narrowly lanceolate, remote, pointed. Juvenile plants have cutting like that of the adults. It grows in sunny, grassy roadsides at the edge of forests. Where populations are more shaded, the plants become less vigorous and less frequent (Mickel 9627, 9687, NY, from Oaxaca).
The third variant has pinnules and segments only moderately ascending, lanceolate, approximate, and sharply pointed (shortacuminate). Juvenile plants have long, undivided pinna tips (Wagner 80805, US, from Hidalgo). It is found in moist pine-oak forests, especially in disturbed areas such as along overgrown lumber roads (Mickel 9681, NY, from Oaxaca).
The type specimen of B. decompositum, however, has somewhat pointed segment apices, and the variants do not seem to have unique morphologies. More collections and additional study are needed to discern species limits in this group.A
Botrychium decompositum in the strict sense has very coarse segmentation with blunt-tipped pinnules and pinnae. The degree of margin toothing/denticulation is quite variable (Pringle 15706, F, GH, UC, from Hidalgo).
A second form has pinnules and segments strongly ascending and narrowly lanceolate, remote, pointed. Juvenile plants have cutting like that of the adults. It grows in sunny, grassy roadsides at the edge of forests. Where populations are more shaded, the plants become less vigorous and less frequent (Mickel 9627, 9687, NY, from Oaxaca).
The third variant has pinnules and segments only moderately ascending, lanceolate, approximate, and sharply pointed (shortacuminate). Juvenile plants have long, undivided pinna tips (Wagner 80805, US, from Hidalgo). It is found in moist pine-oak forests, especially in disturbed areas such as along overgrown lumber roads (Mickel 9681, NY, from Oaxaca).
The type specimen of B. decompositum, however, has somewhat pointed segment apices, and the variants do not seem to have unique morphologies. More collections and additional study are needed to discern species limits in this group.A