A.K.Sarkar’s scientific contributions

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Publications (1)

Fig.-2. A-D-Coreopsis tinctoria Nutt. A-Disc cypsela (anterior side) ; B-Disc cypsela (posterior side) : C-Ray cypsela; DPart of cypselar wall after clearing, showing phytomelan braces. E-I-Cosmos sulphureus Cav. E-Ray cypsela ; F-Disc cypsela; G-Cypselar surface ; H-Cypselar wall after Blearing, showing phytomelan braces; I-Carpopodial cells. J-N-Echinacea purpurea Moench, J-Cypsela ; K-Cypselar apical part; L-Part of pappus corona ; M-Cypselar wall after clearing, showing phytomelan braces ; N-L.S of cypsela. O-S-Gaillardia aristata Pursh, O-Cypsela ; P.Q-Cypselar apical part ; R-Pappus awned scale (setae); S-Cypselar hair. 
Fig.-5. Al, A2-Bidens bitemata (Lour.) Merr. & Sher. Al-Diagrammatic ; A2-A part of cypselar wall at the anterio-posterior lobe. B1, B2-B. cernua L. B1-Diagrammatic ; B2-A part of cypselar wall at the lateral lobe. 
Fig.-11 A1-A4-Tithonia diversifolia (Hemsl.) A. Gray, Al-Diagrammatic ; A2-A part of cypselar wall ; A3-Outer part of pericarp at the lateral side showing pitted parenchymatous cells ; A4-Inner part of pericarp at the lateral side showing secretory cavity. B1-B4-T. rotundifolia (Mill.) Blake, B1-Diagrammatic ; B2-Diagrammatic in part; B3A part of cypselar wall ; B4-Vascular trace (within the large lateral sclerenchymatic brace). 
Fig.-l.-A-E, Bidens cernua L. A. Disc cypsela ; B-Cypselar apical part; C-Cypselar basal Part ; D-Part of cypselar wall after clearing, showing ribs and furrow ; E-Retrorsely barbed hair of awn. F-H-B. pilosa L. F-Disc cypsela ; G-Part of cypselar wail after clearing, showing phytomelan braces; H-Retrorsely barbed hair of awn. I-O-Chrysanthellum americanum (L.) Vatke, I-Disc cypsela ; J-Ray cypsela : K-Disc cypselar basal part; L-Disc cypselar apical part; M-Ray cypselar basal part ; N-Ray cypselar apical part ; O-Part of cypselar wall after clearing, showing phytomelan braces.
Fig.-9. A1-A3-Gaillardia aristdta Pursh, A1-Diagrammatic, A2-A pari of cypselar wall at the anterio-posterior lobe ; A3A part of cypselar wall at the furrow. Bl, B2-Glossogyne bidens (Retz.) Alston, Bl-Diagrammatic ; B2-A part of cypselar wall at the lateral lobe.
COMPARATIVE MORPHO - ANATOMICAL STUDY OF CYPSELAS IN SOME SPECIES OF THE TRIBE HELIANTHEAE (ASTERACEAE). BULL. BOT. SURV. INDIA 40(1-4) : 34-46.BULL. BOT. SURV. INDIA
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January 1998

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339 Reads

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8 Citations

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A.K.Sarkar

ABSTRAC T Acomparativestudyofmorphologyandanatomyofmaturecypselasin14 speciesbelongingto10genera,suchasBIDENS,CHRYSANTHELLUM,COREOPSIS, COSMOS,ECHINACEA,GADXARDIA,GLOSSOGYNE,HELIANTHUS,TITHONIAandXANTHTUM underthetribeHeliantheae(Asteraceae)wasundertakenunderlightandscani...ig electronmicroscopes.Morphologicallytheformandstructureofcypselas, carpopodiaandpappusarediacriticalforcharacterizationoftaxa.Inallspecies pericarpiswelldifferentiatedinto2zones.Cellsoftheepicarpareusually tangentiallyelongated,providedwithyelloworbrownsubstances.Mesocarpis mainlydifferentiatedinto4zones.Numberanddistributionofvasculartraces, phytomelanlayerandsecretorycavitiesaretaxonomicallysignificantincertain taxa.Anartificialtaxonomickeyusingthedetailedmorphological,anatomical andSEMobservationsonthematurecypselasareprovided. KeyWords:Asteraceae-Heliantheae-Morphology-Anatomyofcypseias.

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Citations (1)

... Although achenes of the T. vanensis and T. reticulatus are similar in gross morphology, the beak apex is globular with a hairy annulus in T. vanensis (Fig. 3c, 6a), and it is angular with a slightly hairy annulus in T. reticulatus (Fig. 3d, 6i). The shapes of the epidermal cells are generally tetragonal in Asteraceae (Kothari et al. 2012a(Kothari et al. , 2012b, but they can also be pentagonal, elliptical, or polygonal (Sharma and Sarkar 1998). Tetragonal and elliptical epidermal cell shapes were observed in T. anatolicus by Dogan et al. (2014). ...

Reference:

Taxonomic notes on Tragopogon , and two newly described taxa from Anatolia
COMPARATIVE MORPHO - ANATOMICAL STUDY OF CYPSELAS IN SOME SPECIES OF THE TRIBE HELIANTHEAE (ASTERACEAE). BULL. BOT. SURV. INDIA 40(1-4) : 34-46.BULL. BOT. SURV. INDIA

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A.K.Sarkar