Compilation
Polypodium tetragonum

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Name

Identification
Polypodium pennatum Poir [family POLYPODIACEAE ] (stored under name); Thelypteris pennata (Poir) C.V.Morton [family THELYPTERIDACEAE ] Polypodium tetragonum Sw. [family THELYPTERIDACEAE ] Verified by George Samuel Jenman, Polypodium indet. [family POLYPODIACEAE ] Verified by Daniel Carl Solander,
Related name
  • Goniopteris tetragona
  • Polypodium subtetragonum
  • Aspidium not on sheet
  • Polypodium indet.
  • Dryopteris tetragona
  • Dryopteris usitata
  • Thelypteris pennata
  • Thelypteris venusta
  • Thelypteris tetragona
  • Goniopteris usitatus
  • Polypodium tetragonum
  • Dryopteris patens
  • Thelypteris normalis
  • Thelypteris kunthii
  • Polypodium pennatum
  • Polypodium not on sheet
  • Nephrodium usitatum
Common name
  • Free-tip star-hair fern, Flora of North America Vol. 2

Flora

Entry for Thelypteris tetragona (Swartz) Small [family THELYPTERIDACEAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 2,
Names
Thelypteris tetragona (Swartz) Small [family THELYPTERIDACEAE], Ferns S. E. States, 256. 1938
Polypodium tetragonum Swartz [family POLYPODIACEAE], Prodr., 132. 1788
Dryopteris tetragona (Swartz) Urban [family DRYOPTERIDACEAE]
Goniopteris tetragona (Swartz) C. Presl [family THELYPTERIDACEAE]
Treatment Author(s)
Alan R. Smith
Information
Stems short-creeping, 3--5 mm diam. Leaves somewhat dimorphic, evergreen, somewhat spaced, fertile leaves long-petioled, more erect, and with more contracted pinnae, to ca. 1.1 m. Petiole straw-colored, to 60 cm × 2--5 mm, at base sparsely set with brown, lanceolate, stellate-hairy scales. Blade 30--45(--55) × 15--25 cm, broadest at base, with apical pinna similar to lateral pinnae. Pinnae 6--8(--12) pairs, 7--15(--18) × 2--3 cm (fertile 1--2 cm), incised 1/2--3/4 of width; segments 3--5 mm wide, rounded at apex; veins 6--10 pairs, proximal pair from adjacent segments united at obtuse angle below sinus with excurrent vein ca. 0.5--1 mm to sinus. Indument abaxially of mostly needlelike hairs 0.1--0.3 mm on costae and veins, blade tissue glabrous on both sides. Sori round, medial to supramedial; indusia lacking; sporangia with numerous hairs 0.1 mm. 2 n = 144.
Altitude range
0--50 m
Distribution
MexicoWest Indies in the AntillesCentral America to Panaman South America.USA Fla.

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