Polypodium ptilodon var. caespitosum (Jenman) A.M.Evans

  • Authority

    Proctor, George R. 1989. Ferns of Puerto Rico and the Virgin Islands. Mem. New York Bot. Gard. 53: 1-389.

  • Family

    Polypodiaceae

  • Scientific Name

    Polypodium ptilodon var. caespitosum (Jenman) A.M.Evans

  • Description

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    Species Description - Rhizome creeping, 8-11 mm thick, densely clothed with narrowly deltate, dark red-brown, non-clathrate scales up to 5 mm long. Fronds rather closely distichous, erect, 65-80 cm long; stipes dark reddish-brown, bearing short setulose hairs chiefly along one side. Blades narrowly elliptic, 60-75 cm long, 7-10 cm broad near the middle; rhachis brown, with numerous short setulose hairs especially on adaxial side, beneath with very few minute filiform scales; segments numerous, all ligulate except for the lowermost 5-8 much reduced pairs; evenly dilatate at base, obtuse or acute at apex, separated by rather wide but acute sinuses; veins 1 - to 3-forked, free; tissue crisply subsucculent, dark green. Sori medial, round or nearly so; sporangia sparingly setulose. This variety is stated by Evans (1969) to be a tetraploid.

  • Discussion

    Basionym. Polypodium pectinatum var. caespitosum Jenman, Bull. Bot. Dept. Jamaica n.s. 4: 125. 1897.

    Type. Jenman s.n., from Old England, Jamaica (NY).