Thelypteris toganetra A.R.Sm.
-
Authority
Mickel, John T. & Smith, Alan R. 2004. The pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1-1054.
-
Family
Thelypteridaceae
-
Scientific Name
-
Description
Species Description - Rhizomes long-creeping to suberect; fronds monomorphic or nearly so, to 70 x 30 cm, each with a conform terminal pinna; stipes 15–35 cm x 2–4 mm, glabrous on both sides, or adaxially in the grooves with a few stellate hairs less than 0.1 mm long; blades 25–40 x 12–30 cm, lacking buds in axils of distal pinnae; pinnae 10–16 pairs, 12–30 x 1–3 cm, incised 0.5–0.7 to the costae, sessile, proximal ones narrowed but still lobed at the bases; segments subfalcate, acutish at apices; veins 7–15 pairs, 1–2 proximal pairs from adjacent segments connivent at or just below sinuses, not truly united; indument on both sides absent on rachises, costae, and veins, or adaxially the rachises and costae with a few simple and even fewer stellate hairs ca. 0.1–0.2 mm long, costules, veins, and tissue between veins glabrous on both sides, but sometimes with scattered sessile reddish glands along costules and veins abaxially; sori medial, exindusiate; sporangia glabrous; 2n=72 (Chis).
-
Discussion
Goniopteris toganetra (A. R. Sm.) A° . Lo¨ve & D. Lo¨ve, Taxon 26: 326. 1977. Type. Mexico. Veracruz: Atoyac River, Copeland herb. 34 (UC! isotypes BM, GH!, MEXU!-3 sheets, MICH!, US!).
Thelypteris toganetra is most similar and closely related to T. tetragona and T. imbricata, differing from the former in the veins connivent at the sinuses, or uniting at an acute angle just below the sinuses, and in the glabrous sporangia. From both species T. toganetra differs in the glabrous blades, with hairs absent on all parts of the blades abaxially.
-
Distribution
Shaded wet banks along streams; 50–1300 m. Mexico; Guat, Bel.
Belize Central America| Guatemala Central America| México Mexico North America|