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Accueil du site → Doctorat → Royaume-Uni → 1996 → Taxonomic studies of North African Caryophyllaceae with special reference to the flora of Libya.

University of Glasgow (1996)

Taxonomic studies of North African Caryophyllaceae with special reference to the flora of Libya.

Abuhadra, Mohamed Nuri

Titre : Taxonomic studies of North African Caryophyllaceae with special reference to the flora of Libya.

Auteur : Abuhadra, Mohamed Nuri.

Université de soutenance : University of Glasgow

Grade : Doctor of Philosophy (Ph.D.) : 1996

Résumé
Africa including Libya which has about 22 genera and 80 species within the three subfamilies as currently recognised. The principal part of the thesis concerns the description of the seeds of the Libyan species primarily with the use of scanning electron microscopes (SEM). SEM produces very revealing images of the testa cells and their often striking ornamentation. These seed characters as well as seed colour, shape and size, hilum position and radicle shape have been applied to particular problems at several taxonomic levels up to that of the subfamilies, the limits of which have long been controversial. Within the Caryophyllaceae, whatever its scope, seed characters have always been given importance, but that importance is often under-rated.A survey of the calcium oxalate crystals in the genera Arenaria, Minuartia and Moehringia has been undertaken to an extent and in a detail not previously carried out within any large genus of the family. The size, type and distribution of the foliar crystals has taxonomic significance particularly at the sectional and series. There are especially large crystals in Minuartia subgenus Minuartia which appear to be of taxonomic importance

Annonce : EThOS (UK)

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