Amauropelta loreae (A.R.Sm.) Salino & T.E.Almeida
Descripción
Species habitu et glandibus aurantiacis sessilibus in laminis adaxialiter cum T. balbisii et T. resinifera optime congruens, sed indusiis minutis inconspicuis differt; a T. mortonii paribus paucioribus pinnarum proximalium subabrupte reductis, rhizomatibus erectis differt. (Dedicated to Dr. Francisco (Paco) Lorea-Hernández (1956–; Instituto de Ecología, Xalapa, Mexico), keen observer and premier collector of ferns from Guerrero, as well as specialist in Lauraceae.)
Rhizomes erect, caudices to 12 cm long; fronds 65–85 cm long; stipes stramineous, mostly ca. 15 cm X 2–4 mm, bearing scattered, thin, persistent, tan, ovate, glabrous, somewhat appressed to slightly spreading scales to ca. 3 X 2 mm; blades 50–70 x 14–25 cm, with 3–5 pairs of subabruptly reduced pinnae proximally, the shortest ca. 1(–3) cm long, lacking proliferous buds; pinnae to 8–13 X 1.5–2.5 cm, deeply incised to within 1 mm of costae, usually opposite or subopposite proximally, reduced proximal pinnaedeflexed, others patent, proximal segments of individual pinnae about the same size as adjacent more distal segments; aerophores absent or tuberculate at pinna bases; segments perpendicular or slightly ascending with respect to costae, linear, 2–4 mm wide; veins ca. 10 pairs per segment; indument abaxially of sparse hairs 0.1–0.2 mm long on rachises, costae, and costules, or axes nearly glabrous, costae also with very narrow, amorphous, tan scales to ca. 0.5 mm long, 2–3 cells wide, tissue between veins with numerous orangish sessile hemispherical glands, adaxially the blades glabrous between veins; sori supramedial to submarginal, with minute indusia 0.1–0.2 mm diam., these nearly or quite obscured by orangish glands and/or mature sporangia; sporangia glabrous.A
Rhizomes erect, caudices to 12 cm long; fronds 65–85 cm long; stipes stramineous, mostly ca. 15 cm X 2–4 mm, bearing scattered, thin, persistent, tan, ovate, glabrous, somewhat appressed to slightly spreading scales to ca. 3 X 2 mm; blades 50–70 x 14–25 cm, with 3–5 pairs of subabruptly reduced pinnae proximally, the shortest ca. 1(–3) cm long, lacking proliferous buds; pinnae to 8–13 X 1.5–2.5 cm, deeply incised to within 1 mm of costae, usually opposite or subopposite proximally, reduced proximal pinnaedeflexed, others patent, proximal segments of individual pinnae about the same size as adjacent more distal segments; aerophores absent or tuberculate at pinna bases; segments perpendicular or slightly ascending with respect to costae, linear, 2–4 mm wide; veins ca. 10 pairs per segment; indument abaxially of sparse hairs 0.1–0.2 mm long on rachises, costae, and costules, or axes nearly glabrous, costae also with very narrow, amorphous, tan scales to ca. 0.5 mm long, 2–3 cells wide, tissue between veins with numerous orangish sessile hemispherical glands, adaxially the blades glabrous between veins; sori supramedial to submarginal, with minute indusia 0.1–0.2 mm diam., these nearly or quite obscured by orangish glands and/or mature sporangia; sporangia glabrous.A
Forma de vida
TerrestreA
Ejemplar revisado
(Related to the synonym Thelypteris loreae) Gro (Lorea 1913, NY, UC, XAL).A
Distribución
México (país) EndémicoA
Elevación
2100 – 2150 mA
Ecología y Hábitat
Soils with abundant organic material.A
Tipo de vegetación
Bosque de neblina/mesófiloA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
(In relation to the synonym Thelypteris loreae) This species seems to combine characters of several species in different subgroups of subg. Amauropelta. Like species of sect. Amauropelta, T. loreae bears orangish sessile glands on the tissue between veins abaxially; however, unlike most species in that section, the indusia are very small, so small that it is difficult to see them except in very young specimens. Other species belonging to sect. in Mexico include T. balbisii, T. resinifera, and T. struthiopteroides, all of which have relatively large, conspicuous indusia. Another species in this group is T. sancta, which does have very small indusia. However, it differs strongly from T. loreae in having inequilateral pinnae, much smaller blades, and in being rheophytic; it seems unlikely to be closely related. The only other species in sect. Amauropelta in Mexico is T. mortonii, an uncommon and small-indusiate species restricted to the states of Morelos and México; but T. mortonii has 10–20 pairs of gradually reduced proximal pinnae and shortcreeping rhizomes, and also seems more distantly related. In T. loreae, there are a few amorphous and fibrillose scales on the costae abaxially, but these are unlike the clathrate or subclathrate scales in species of sect. Lepidoneuron. I find no evidence of hamate or fasciculate hairs on the blade axes, eliminating sects. Uncinella and Phacelothrix as possible homes. In the sum of its characters, T. loreae could be transitional to taxa such as T. deflexa, in sect. Apelta. Species in sect. Apelta lack indusia and have relatively few reduced proximal pinnae, but they also lack laminar glands. Thus, T. loreae is placed in sect. Amauropelta with slight uncertainty, and with no obvious sister species relationships.A