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Allicospermum budantsevii
Allicospermum budantsevii Gordenko Paleontol. Zhurn., 2015, (1): 96. 2015
- Name
- Allicospermum budantsevii
- Rank
- Species
- Generic Name
- [Genus] Allicospermum
- Authors (Pub.)
- Gordenko N. V.
- Publication
- Novaya interpretatsiya semyan Grenana Samylina (Gymnospermae) iz srednej yury Angrena Uzbekistan [2015]
- Journal
- Paleontologicheskii Zhurnal
- Annee/Jahrgang
- 2015
- Issue
- 1
- Page number
- 96
- Year
- 2015
- Fossil Status
- seeds
- Stratigraphy
- Middle Jurassic
- Strat. comment
- Angrenian suite
- Location
- Angren, Uzbekistan
- Paleoregion
- Eurasia (Central Asia)
Data for Holotypus
- Repository
- Komarov Botanical Institute, Russian Academy of Sciences, St.-Petersburg, Russian Federation
- Repository Number
- 813/1N 48
- Diagnosis
- Seeds bilateral, ellipsoidal, rounded
or pointed in their apical part, rarely abruptly narrowed near chalaza, 5–10.7 mm long, 3.9–9.8 mm
wide. Micropyle protruding, mucronate.
Integument consists of sarcotesta, containing numerous resin bodies, and sclerotesta. The outer integument cuticle thick, with numerous scattered, ran!
domly orientated stomata. Stomata monocyclic or
very rarely incompletely amphicyclic, with 5–8 (usually 7–8) subsidiary cells. In the middle part of seed,
subsidiary cells often bear variously developed proximal papillae, near seed base and micropyle predomi!
nantly without papillae. Subsidiary cells of the same
size as ordinary epidermal cells. At base and in apical
part of seed, ordinary epidermal cells form longitudinal chains, prominent in outer surface relief; in the
middle part of seed, ordinary cells form cell packets.
Anticlinal cell walls straight or slightly curved, cell
corners rounded. Periclinal cell walls dome-shaped,
thickened.
Nucellus free from integument on at least one
third, with well distinguished pollen chamber, containing monosulcate pollen grains. Nucellus cuticle
thin, consists of longitudinally elongated tetragonal,
less common pentagonal cells. Cell corners slightly
rounded. Periclinal cell walls flat.
Megaspore membrane up to 3 μm thick, consists of
alveolar and foot layers. Foot layer finely granular,
0.3 μm thick. Alveolar layer consists of irregularly
branched and coalescent bacula, 0.3–1.5 μm long,
about 0.2–0.3 μm thick, orientated obliquely relative
to foot layer.
