Elaphoglossum potosianum
Description
Rhizomes short-creeping, 2–3 mm diam.; rhizome scales lanceolate to linear-lanceolate, orange, occasionally black with age (especially in Hidalgo), ca. 3 mm long, apices attenuate, subentire with occasional short teeth; fronds approximate, 12–21 X 1.4–2.2 cm; phyllopodia distinct, 3–4 mm; stipes 1⁄3–1⁄2 the sterile frond length, with scales ca. 1 mm, scattered, mostly appressed, stellate, proximally with a few lanceolate scales like those of rhizomes; blades narrowly elliptic, chartaceous, bases narrowly to broadly cuneate, apices acute to acuminate; veins free, simple or once-forked, ca. 1 mm apart, at 60–70° angle to costa; hydathodes absent; blade scales adaxially scattered, substellate, mostly ca. 0.5 mm, abaxially the blades with simple to 3-armed trichomidia subtended or not by resinous dots; fertile fronds surpassing the sterile in length, stipes ca. 2⁄3 the frond length, with a few lanceolate scales on abaxial costae.A
A. Mickel, J. T. & Smith, A. R. 2004: The Pteridophytes of Mexico Vol. 88
Discussion
This species is similar to E. petiolatum except: abaxial blade indument of simple to 3-armed stellate trichomidia with or without small resinous subtending dots (vs. large dots and/or substellate scales), and rhizome scales usually orange, occasionally black with age (vs. always black). Elaphoglossum potosianum has been mistakenly identified as E. muelleri because of the orange rhizome scales.B
B. Mickel, J. T. & Smith, A. R. 2004: The Pteridophytes of Mexico Vol. 88
Distribution
México (Country) endemicC
Specimen
DF (Schaffner 93, NY). Gto (Correll &Correll 2882, LL). Hgo (Knobloch 682, MSC; Orcutt 885, DS). NL (Dorr 2597, TEX; Hinton 22119, ARIZ, TEX, 22679, NY). SLP (Schaffner 92, NY). Tam (González Medrano 17496, MEXU).D
D. Mickel, J. T. & Smith, A. R. 2004: The Pteridophytes of Mexico Vol. 88