Computer simulation of sphenopsid architecture. Part II. Calamites multiramis Weiss, as an example of late paleozoic arborescent sphenopsids

Daviero V., Lecoustre René. 2000. Computer simulation of sphenopsid architecture. Part II. Calamites multiramis Weiss, as an example of late paleozoic arborescent sphenopsids. Review of Palaeobotany and Palynology, 109 : 135-148.

Autre titre : Simulation informatique de l'architecture d'un sphénopside. II. Calamites multiramis Weiss, un exemple de sphénopside arborescent du paléozoïque tardif

Résumé : A late carboniferous arborescent sphenopsid has been modelled for the first time with the AMAP 1 system. The natural entity consisting of the three form species #Calamites multiramis#, #Annularia stellata#, #Calamostachys tuberculata# (respectively the trunk/branches and foliage/cones) representing the aerial part of this plant is reconstructed and its architecture modelled. The different growth stages are extrapolated, generating a dynamic view that did not exist until now. The model is based on the hypothesis that the modelled part is not preformed but results from the successive production and elongation of internodes. This growth led to old ontogenetic stages of the plant in agreement with Remy and Remy's reconstruction (Remy, W., Remy, R., 1977. Die Floren des Erdaltertums. Verlag Glückauf, Essen, 468 pp.). With its verticillate sterile organs and cone-shaped fructifications similar to the extant herbaceous relative #Equisetum#, this calamite is distinguished from the latter taxon by having possible 'throw-away' phyllomorphic branches. We assumed the presence of a restricted zone of branches located in the apical part of the trunk. Moreover, the production of reproductive organs that succeeds the vegetative stage implies a major photosynthetic phase associated with a monocarpical form of development of the fossil plant.

Mots-clés Agrovoc : plante, paléontologie, croissance, port de la plante, modèle de simulation, modélisation

Mots-clés complémentaires : Calamites multiramis, Plante fossile, Architecture végétale

Classification Agris : U10 - Informatique, mathématiques et statistiques
F50 - Anatomie et morphologie des plantes
F62 - Physiologie végétale - Croissance et développement

Auteurs et affiliations

• Daviero V., Palaeontologischen Institut und Museum (DEU)
• Lecoustre René, CIRAD-AMIS-AMAP (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/475949/)

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