Alstonia scholaris (L.) R. Br.
Metadata
Description
2-colporate grain in equatorial view: analysis of aperture and optical section and deep focus (Figs. 1-3)
Pollen Slide N°
IFP 689
Code
alstscho
Type
Still image
Creator
IFP Team
Creation Date
[s.d.]
Publisher
Institut français de Pondichéry
License
Metadata
Description
2-colporate grain in equatorial view: analysis of aperture and optical section and deep focus (Figs. 1-3)
Pollen Slide N°
IFP 689
Code
alstscho
Type
Still image
Creator
IFP Team
Creation Date
[s.d.]
Publisher
Institut français de Pondichéry
License
Metadata
Description
2-colporate grain in equatorial view: analysis of aperture and optical section and deep focus (Figs. 1-3)
Pollen Slide N°
IFP 689
Code
alstscho
Type
Still image
Creator
IFP Team
Creation Date
[s.d.]
Publisher
Institut français de Pondichéry
License
Metadata
Description
Oblique equatorial view: 2-colporate grain with syncolpy at one pole; note the faintly visible foveolate character
Pollen Slide N°
IFP 689
Code
alstscho
Type
Still image
Creator
IFP Team
Creation Date
[s.d.]
Publisher
Institut français de Pondichéry
License
Metadata
Description
2-colporate grain in polar view (elliptic outline)
Pollen Slide N°
IFP 689
Code
alstscho
Type
Still image
Creator
IFP Team
Creation Date
[s.d.]
Publisher
Institut français de Pondichéry
License
Metadata
Description
3-colporate grain in polar view: foveolate surface and optical section (Figs. 6-7)
Pollen Slide N°
IFP 689
Code
alstscho
Type
Still image
Creator
IFP Team
Creation Date
[s.d.]
Publisher
Institut français de Pondichéry
License
Metadata
Description
3-colporate grain in polar view: foveolate surface and optical section (Figs. 6-7)
Pollen Slide N°
IFP 689
Code
alstscho
Type
Still image
Creator
IFP Team
Creation Date
[s.d.]
Publisher
Institut français de Pondichéry
License
Family
Genus
Key
pollen_000007
Collection Object
Basis of Record
Preserved specimen
Recorded By
Event Date
1961-04-27
Collection Code
PIFP
Institution Code
IFP
Code
alstscho
Pollen Slide N°
Pollen Slide N°: IFP 689
Determination
Family
Genus
Specific Epithet
Scientific Name
Scientific Name Authorship
Genus Authorship
R.Br.
Morphology
Symmetry and Form
Monad, radial_symmetry, isopolar or subisopolar (syncolpate at one pole) 2- or 3-colporate; elliptic ( E > P ) in equatorial_view; circular (3-ap.) or elliptic (2-ap.) in polar_view
Dimensions
Polar_Axis = 20-28 µm; Equatorial_Axis = 26-31 µm
Apertures
Two or three colpora, Colpus elliptic: colpus apex acute or obtuse, frequently syncolpate at one pole, aperture_membrane granular, distance between the adjacent colpal apices 15-17 µm, margo undifferentiated; costae_colpi absent, Os: circular (d = 4 µm) to ellipsoidal with irregular outline, oral_costae present
Exine
Foveolate, tectate, infratectum columellate, exine thickness at the mid-point of the intercolpium ±2.0 µm
Remark
A eurypalynous genus characterised by four pollen types. On the basis of endoaperture type and aperture number and pollen size, four pollen types can be distinguished [Kuijit, J. & Van der Ham, R.W. (1997: Table 2)]
Tentative Pollen Typification
Alstonia type X
References (Generic Palynology)
LM (micrographs) of Alstonia in Guinet, Ph. 1962; SEM (microgaph) of A. scholaris (fig. 10) along with those of other species of Alstonia in Kurjit, J. & Van der Ham, R.W. (1997: figs. 1-12)
Location
Continent
Country
State / Province
Locality
Nilgiris, East slope
Maximum Elevation in Meters
1200m
Ecology and Taxonomy
A large evergreen tree. Both in deciduous and evergreen forests up to 700m from the plain up to 1100m; in dense deciduous wet forests. Leaf illustration: Pascal, J-P. & Ramesh, B.R. (1987), fig. 32 Generic description and specific key in Flora of Madras: p. 569 (Gamble, J.S., 1967)
Distribution of Species
Northern Circars, not very common. Deccan; Western Ghats: in all Districts. South India especially Western Ghats
Distribution of Genus
50 spp., Indomal., Polynesia (Willis, J.C., 1988). Keys and distribution data for 2 species in Flora of Madras: p. 569 (Gamble, J.S., 1967)
Reuse
License
Cite as
Alstonia scholaris (L.) R. Br.,
in Digital Collections, Institut Français de Pondichéry,
Pollen Slides,
consulted on February, 5th 2025, https://ifp.inist.fr/s/ecological-specimens/item/461761