Back
Peltaspermum petaloides
Peltaspermum petaloides Naug. Trudy Geol. Inst. Ross. Akad. Nauk, (612): 85. 2016
- Name
- Peltaspermum petaloides
- Rank
- Species
- Generic Name
- [Genus] Peltaspermum
- Authors (Pub.)
- Naugolnykh S. V.
- Publication
- Flora Permica. Rastitel'nyj mir permskogo perioda: Priural'e [2016]
- Journal
- Trudy Geologicheskogo Instituta Rossijskoj Akademii Nauk
- Issue
- 612
- Page number
- 85
- Year
- 2016
- Fossil Status
- reproductive organs (seed)
- Stratigraphy
- Kungurian
- Location
- Chekarda-1, left bank of Sylva River, Perm' Territory, Russian Federation
- Paleoregion
- Angarida
Data for Holotypus
- Repository
- Geological Institute, Russian Academy of Sciences, Moscow, Russian Federation
- Repository Number
- № 4856/148 & № 4856/148a
- Diagnosis
- Peltasperms with racemose seed-bearing
organs, consisting of radially-symmetrical peltoids
(stalked seed-bearing discs or = megasporophylls)
aggregated into cone-like structure. Discs
large, up to 2,5 cm in diameter. Each peltoid connected
to cone axis by well-developed stalk, attached
to center or near-margin area of adaxial surface
of peltoid. Seed-bearing discs round to ovoid,
often slightly asymmetrical because of near-margin
position of peltoid stalk. Disc margins have well-developed
marginal festoons or even lobes with round
tips. Lobes isometrical to long, well-pronounced.
Each disc has 20–25 radial sectors corresponding to
marginal festoons or lobes. Seed scars are disposed
at base of festoons or lobes, in average distance of
3/4 of disc radius from disc stalk. Seed scars round
to ovoid, with small point-like raphe of conducting
strand in scar center. Small concentric folds around
central depression on abaxial surface of seed-bearing
discs. Ovules ovoid, with acute apex and round base,
sometimes with limb formed by deformation of marginal
part of sarcotesta. Small resin bodies of fusiform
or round shape in sarcotesta.
Cuticles of adaxial and abaxial sides of seedbearing
disc different. Abaxial cuticle thicker, with
rare stomata. Adaxial cuticle thinner, with numerous
stomata. Stomata of both leaf sides monocyclic,
slightly sunken, with proximal cutinisation of
subsidery cells. Bases of trichomes occur on lower
(adaxial) surface of peltoid.
