Elaphoglossum potosianum Mickel
-
Authority
Mickel, John T. & Smith, Alan R. 2004. The pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1-1054.
-
Family
Dryopteridaceae
-
Scientific Name
-
Description
Species 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 60–70º 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.
-
Discussion
Type. Mexico. San Luis Potosi´: Schaffner 77 (P!).P>
Elaphoglossum trichomidiatum Mickel, Brittonia 53: 488. 2001[2002]. Type. Mexico. San Luis Potosi´: In the region of San Luis Potosi´, 1878, Parry & Palmer 1007 (NY!; isotype US!).
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.