familyPteridaceae
genusPityrogramma
Show Lower Taxa
Difference between revisions of "Pityrogramma"
Handbuch 3: 19. 1833.
Common names: Silverback fern goldback fern
Etymology: Greek pityros, bran, and gramma, lines (as in written characters), referring to the farina covering the abaxial leaf blade surface
Treatment appears in FNA Volume 2.
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| − | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>terrestrial [or on rock]. <b>Stems</b> erect or nearly so, unbranched; scales brown, concolored or nearly so, lanceolate, margins entire. <b>Leaves</b> monomorphic, closely spaced, 25–150 cm. <b>Petiole</b> black to purplish black or reddish brown, longitudinally grooved adaxially, glabrous, with 2(–3) vascular bundles. <b>Blade</b> linear-lanceolate to ovate or elongate-triangular, 1–4-pinnate, herbaceous to leathery, abaxially usually farinose, farina white or yellow, sometimes partially or completely replaced by trichomes, adaxially glabrous, dull, not striate; rachis straight. <b>Ultimate</b> segments stalked or sessile, free from costa or partially adnate to it, narrowly triangular to linear, entire or lobed; base narrowly cuneate, stalks when present green, not lustrous; margins not recurved to form false indusia. <b>Veins</b> of ultimate segments free, obscure, pinnately branched and divergent distally. <b>False</b> indusia absent. <b>Sporangia</b> scattered along veins, containing 32 or 64 spores, intermixed with farina-producing glands. <b>Spores</b> tan with dark brown ridges, tetrahedral-globose, perispore usually reticulate, with equatorial flange (except in Pityrogramma trifoliata). <b>Gametophytes</b> glabrous.</span><!-- |
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|publication year=1833 | |publication year=1833 | ||
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|genus=Pityrogramma | |genus=Pityrogramma | ||
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Revision as of 13:25, 27 July 2019
Plants terrestrial [or on rock]. Stems erect or nearly so, unbranched; scales brown, concolored or nearly so, lanceolate, margins entire. Leaves monomorphic, closely spaced, 25–150 cm. Petiole black to purplish black or reddish brown, longitudinally grooved adaxially, glabrous, with 2(–3) vascular bundles. Blade linear-lanceolate to ovate or elongate-triangular, 1–4-pinnate, herbaceous to leathery, abaxially usually farinose, farina white or yellow, sometimes partially or completely replaced by trichomes, adaxially glabrous, dull, not striate; rachis straight. Ultimate segments stalked or sessile, free from costa or partially adnate to it, narrowly triangular to linear, entire or lobed; base narrowly cuneate, stalks when present green, not lustrous; margins not recurved to form false indusia. Veins of ultimate segments free, obscure, pinnately branched and divergent distally. False indusia absent. Sporangia scattered along veins, containing 32 or 64 spores, intermixed with farina-producing glands. Spores tan with dark brown ridges, tetrahedral-globose, perispore usually reticulate, with equatorial flange (except in Pityrogramma trifoliata). Gametophytes glabrous.
Distribution
Primarily neotropical, some in Africa, introduced elsewhere in Eastern Hemisphere.
Discussion
The name Nesoris bicolor Rafinesque was based on a yellow-farinose plant from Florida and presumably represents a species of Pityrogramma. A type has not been located, and C. S. Rafinesque's (1836[–1838]b, part 4) description is not precise enough to permit equation of this name with modern nomenclature. No yellow-farinose Pityrogramma has since been reported from Florida.
Pentagramma has been segregated from Pityrogramma (G. Yatskievych et al. 1990) and comprises what was the Pityrogramma triangularis (Kaulfuss) Maxon complex.
Species ca. 15 (2 in the flora).
Selected References
Lower Taxa
Key
| 1 | Distal pinnae pinnately lobed or divided, narrowly triangular. | Pityrogramma calomelanos var. calomelanos |
| 1 | Distal pinnae entire or serrulate, linear to narrowly lanceolate. | Pityrogramma trifoliata |