Pteris cretica
Pteris cretica var. albolineata
Cretan brake, Cretan brake fern, ribbon fern
Cretan brake, white-lined Cretan brake
slender, creeping, sparingly scaly;
scales dark brown to chestnut brown.
clustered to closely spaced, to 1 m.
straw-colored to light brown distally, darker proximally, 10–50 cm, base sparsely scaly.
irregularly ovate, primarily and irregularly pedately divided, 10–30 × 6–25 cm;
rachis not winged;
only terminal pinna decurrent on rachis.
1–3 pairs, well separated, blade often 5-parted with terminal pinna and 2 lateral pairs of pinnae remaining green through winter, not articulate;
sterile pinnae to 25 × 0.8–1.5 cm, serrulate;
fertile pinnae narrower than sterile pinnae, to ca. 11 mm wide, spiny-serrate;
base acute acroscopically and decurrent (sometimes narrowly and barely so) basiscopically, glabrous;
proximal pinnae with 1 (rarely 2) basiscopic lobes.
with white or pale green, longitudinal streak along middle;
sterile pinnae to ca. 25 mm wide, fertile pinnae to ca. 15 mm wide;
terminal pinna usually not decurrent on rachis.
free, simple or forked.
narrow, blade tissue exposed abaxially.
Pteris cretica
Pteris cretica var. albolineata
Pteris cretica is almost pantropical in distribution (C. V. Morton 1957). Because this species is so commonly and widely cultivated and appears to escape easily in warmer regions, its native range is uncertain.
Young leaves of young plants of Pteris multifida may key to P. cretica because only the terminal pinnae may be decurrent on the rachis as in P. cretica. Juveniles of P. multifida can be separated by proximal pinnae with long-attenuate apices and thinner-textured leaves than P. cretica. Juveniles of P. cretica have proximal pinnae with acute to blunt or nearly rounded apices and thicker-textured leaves.
Varieties 2 (2 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Two taxa are considered doubtful species and are therefore excluded. Pteris ensiformis Burman f. cv. victoriae Baker was reported for peninsular Florida by E. T. Wherry (1964), and as far as I can determine, this is the only report of the species for the flora. The source for the record is uncertain. Pteris grandifolia Linnaeus was reported from Dade County, Florida, by T. Darling Jr. (1961), the original find probably occurring in 1952 (E. T. Wherry 1964) and representing either an escape from cultivation or plants merely persistent from cultivation. Recent searches throughout the original location have failed to turn up extant populations; probably the plants have disappeared.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Pinnae green throughout. | var. cretica |
1. Pinnae with broad, white, central stripe. | var. albolineata |
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