Thelypteris guadalupensis (Wikstr.) Proctor

  • Authority

    Mickel, John T. & Smith, Alan R. 2004. The pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1-1054.

  • Family

    Thelypteridaceae

  • Scientific Name

    Thelypteris guadalupensis (Wikstr.) Proctor

  • Description

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    Species Description - Rhizomes short-creeping to suberect, 4–6 mm diam. (excluding stipe bases), bearing an apical tuft of pale brown, lanceattenuate, minutely stellate-puberulous scales 5–9 mm long; fronds often or usually somewhat dimorphic, the sterile ones shorter and spreading or prostrate, the fertile ones longer, longstiped, and rigidly erect; stipes of fertile fronds to 15 cm, minutely stellate-puberulous; blades lanceolate, narrowly oblanceolate, or linear-attenuate, 10–40 x 2–7(–9) cm, pinnate only at bases, with 1–3 pairs of greatly reduced, more distant proximal pinnae, blades otherwise lobed or pinnatifid; pinnae entire to crenulate or shallowly lobed, 1–5.5 x 0.5–1.5 cm, confluent at the bases with adjacent pinnae; segments deltate-oblong to linear-oblong, obtuse or somewhat acute, entire to crenate or lobed; veins 8–18 pairs, mostly pinnately branched, the proximal veins joined and forming a series of areoles along the rachises and costae; indument abaxially of moderate to dense stellate hairs on rachises, costae, and veins, also with a few on leaf issue between veins, adaxially glabrous except for relatively sparse hairs on rachises and costae; sori inframedial, indusia small, stellate-puberulous; sporangia glabrous; 2n =144 (Jam).

  • Discussion

    Polypodium guadalupense Wikstr., Kongl. Vetensk. Acad. Handl. 1825: 435. 1826. Dryopteris guadalupensis (Wikstr.) C. Chr., Index Filic. 291. 1905, hom. illeg., non Kuntze, 1891. Type. Guadeloupe. Forsstro¨m s.n. (S).

    Polypodium domingense Spreng., Syst. Veg., ed. 16, 4: 51. 1827. Dryopteris domingensis (Spreng.) Maxon, Pteridophyt. Porto Rico 474. 1926. Goniopteris domingensis (Spreng.) Pic. Serm., Webbia 31: 251. 1977. Type. Hispaniola. Bertero s.n. (?).

    This is another of the Antillean calciphiles that is known only from the Yucatan Peninsula in Mexico (Riba, 1993). Other examples with this distribution pattern are Sphenomeris clavata and Thelypteris reptans. Thelypteris guadalupensis differs from other species of subg. Goniopteris in Mexico in having the blades merely lobed to pinnatifid, or 1-pinnate only at the bases (1–3 pairs of free proximal pinnae). In blade dissection, it is similar to T. skinneri (Hook.) C. F. Reed, known from Guatemala and Belize, which differs in having the rachises and veins bearing some stout acicular hairs and in having setose (vs. stellate-hairy) indusia. A putative hybrid between T. guadalupensis and T. reptans (T. darwinii form) has been found in Quintana Roo, growing with T. guadalupensis (Palacios-Rios 3691, XAL). The hybrid is intermediate in morphology between the suspected parents.

  • Distribution

    Epipetric on limestone rocks, associated with Tectaria heracleifolia, in low subdeciduous riparian forests; 50– 100 m. Mexico; Gr & L Ant.

    Mexico North America| West Indies|