Microgramma tecta (Kaulf.) Alston
Categoría IUCN
No incluidaA
Categoría NOM-059-SEMARNAT-2010
No incluidaB
Discusión taxonómica
Microgramma tecta var. nana (Liebm.) Mickel & Beitel, Mem. New York Bot. Gard. 46: 251. 1988
Microgramma nana (Liebm.) T.E.Almeida, Phytotaxa 354(1): 41. 2018
Acrostichum nanum Liebm., Kongel. Danske Vidensk.-Selsk. Skr. V(1): 171 (seors. 19). 1849
Polypodium blandulum Christ, Bull. Herb. Boissier ser. 2, 7: 259. 1907
Rhizomes slender, 0.3–0.5 mm diam.; rhizome scales 2–3 mm long, concolorous, light brown, narrow, peltate, somewhat spreading, entire; fronds dimorphic, thin; stipes 0–12 mm long in sterile fronds, 1–10 mm in fertile fronds; sterile blades ovate to orbicular or elliptic, 8–20 X 6–13 mm, apices obtuse, bases cordate to truncate; fertile blades lanceolate, 10–40 X 2.5–5 mm, apices obtuse, bases cuneate; indument of numerous narrow, brownish scales, 1–1.5 mm long on both blade surfaces, scales with orbicular fimbriate bases and long hair-like tips; sori round, with narrow scales (like laminar scales) among the sporangia.
Distribution. Epiphytic, mixed forest of pines and hardwoods; 1100–2200 m. Mexico; CR; Col, Ven, Guy (Jansen-Jacobs 4962, UC), Sur, Fr Gui, Ec, Peru, Bol. Also reported from Honduras by Moran (in Davidse et al., 1995).
Specimens Examined. Chis (Gilly & Hernández X. 162, US p.p.). Oax (Anderson 13205, CAS, CHAPA, IEB, MO, NY; Bashor 1971, NY; Campos V. 1011, MEXU; Conzatti & Reko 3033, 3298, MEXU, US).
The small blade size with distinctly dimorphic fronds, lanceolate blade scales, and similar soral scales distinguish this species from congeners in Mexico. Variety tecta, from southeastern Brazil (based on Polypodium tectum Kaulf., Enum. Filic. 87. 1824. Type. Brazil. Ilha de Santa Catarina, Chamisso s.n., LE), is distinguished primarily by the broader scales of the fertile blades (mostly 0.3–0.6 mm wide at bases vs. 0.1–0.25 mm wide in var. nana) and the longer sterile blades (length 2–4 times width, acute at tips vs. length equalling to 1.5 times width, obtuse at tips in var. nana).
C
Microgramma nana (Liebm.) T.E.Almeida, Phytotaxa 354(1): 41. 2018
Acrostichum nanum Liebm., Kongel. Danske Vidensk.-Selsk. Skr. V(1): 171 (seors. 19). 1849
Polypodium blandulum Christ, Bull. Herb. Boissier ser. 2, 7: 259. 1907
Rhizomes slender, 0.3–0.5 mm diam.; rhizome scales 2–3 mm long, concolorous, light brown, narrow, peltate, somewhat spreading, entire; fronds dimorphic, thin; stipes 0–12 mm long in sterile fronds, 1–10 mm in fertile fronds; sterile blades ovate to orbicular or elliptic, 8–20 X 6–13 mm, apices obtuse, bases cordate to truncate; fertile blades lanceolate, 10–40 X 2.5–5 mm, apices obtuse, bases cuneate; indument of numerous narrow, brownish scales, 1–1.5 mm long on both blade surfaces, scales with orbicular fimbriate bases and long hair-like tips; sori round, with narrow scales (like laminar scales) among the sporangia.
Distribution. Epiphytic, mixed forest of pines and hardwoods; 1100–2200 m. Mexico; CR; Col, Ven, Guy (Jansen-Jacobs 4962, UC), Sur, Fr Gui, Ec, Peru, Bol. Also reported from Honduras by Moran (in Davidse et al., 1995).
Specimens Examined. Chis (Gilly & Hernández X. 162, US p.p.). Oax (Anderson 13205, CAS, CHAPA, IEB, MO, NY; Bashor 1971, NY; Campos V. 1011, MEXU; Conzatti & Reko 3033, 3298, MEXU, US).
The small blade size with distinctly dimorphic fronds, lanceolate blade scales, and similar soral scales distinguish this species from congeners in Mexico. Variety tecta, from southeastern Brazil (based on Polypodium tectum Kaulf., Enum. Filic. 87. 1824. Type. Brazil. Ilha de Santa Catarina, Chamisso s.n., LE), is distinguished primarily by the broader scales of the fertile blades (mostly 0.3–0.6 mm wide at bases vs. 0.1–0.25 mm wide in var. nana) and the longer sterile blades (length 2–4 times width, acute at tips vs. length equalling to 1.5 times width, obtuse at tips in var. nana).
C