Elaphoglossum yourkeorum
Description
Ab E. sartorii laminis fertilibus angustioribus et basibus latioribus laminarum sterilium differt. (Dedicated to Gertrude and George Yourke, who have been highly supportive of the New York Botanical Garden’s fern program.)
Rhizomes compact, horizontal, 4–8 mm diam.; rhizome scales linear to linear-lanceolate, 5–10 mm, concolorous orange-tan, with irregular lateral hair-like processes; fronds approximate to 0.5 cm distant, 16–58 X 3–6 cm; phyllopodia distinct, 1–1.5 cm long; stipes 1⁄6–2⁄5 the frond length, with orange-tan scales proximally; blades elliptic, broadly cuneate at bases forming a 65–95° angle, apices acute to acuminate, coriaceous; veins obscure, free, simple to 2-forked, ca. 1 mm apart, at 70–85° angle to costa; hydathodes absent; adaxial blade surfaces glabrous; abaxial blades surfaces with linear scales at base (2–3 mm), also with sparse orange-tan trichomidia, mostly 1–2 mm; fertile fronds about equalling to somewhat surpassing the sterile, stipes 1⁄4–1⁄3 the frond length, blades linear-elliptic, 10–18 mm wide, intersporangial scales absent.
A
A. Mickel, J. T. & Smith, A. R. 2004: The Pteridophytes of Mexico Vol. 88
Rhizomes compact, horizontal, 4–8 mm diam.; rhizome scales linear to linear-lanceolate, 5–10 mm, concolorous orange-tan, with irregular lateral hair-like processes; fronds approximate to 0.5 cm distant, 16–58 X 3–6 cm; phyllopodia distinct, 1–1.5 cm long; stipes 1⁄6–2⁄5 the frond length, with orange-tan scales proximally; blades elliptic, broadly cuneate at bases forming a 65–95° angle, apices acute to acuminate, coriaceous; veins obscure, free, simple to 2-forked, ca. 1 mm apart, at 70–85° angle to costa; hydathodes absent; adaxial blade surfaces glabrous; abaxial blades surfaces with linear scales at base (2–3 mm), also with sparse orange-tan trichomidia, mostly 1–2 mm; fertile fronds about equalling to somewhat surpassing the sterile, stipes 1⁄4–1⁄3 the frond length, blades linear-elliptic, 10–18 mm wide, intersporangial scales absent.
A
Discussion
This species is distinct among the E. sartorii complex in having very narrow fertile blades and very broadly cuneate bases on the sterile blades.B
B. Mickel, J. T. & Smith, A. R. 2004: The Pteridophytes of Mexico Vol. 88
Habitat & Ecology
On steep slopes.D
D. Mickel, J. T. & Smith, A. R. 2004: The Pteridophytes of Mexico Vol. 88
Specimen
Chis (Breedlove 21840, 22196, NY). Oax (Maya J. 2182, 3934, NY; Mickel 4751, 5226, 6524, 6678, NY; Rzedowski 21125, ISC). Guat (Thieme s.n. [Donn. Sm. 5667], NY; Heyde & Lux s.n. [Donn. Sm. 4077], NY). Salv (Seiler 578, NY). Hond (Morton 7565, NY; Yuncker 5848, NY).
E
E. Mickel, J. T. & Smith, A. R. 2004: The Pteridophytes of Mexico Vol. 88
E
Synonymy
Elaphoglossum yourkeorum, Mem. New York Bot. Gard. 88: 314 (-315; f.125D-E). 2004