BIO1042 Lecture Notes - Lecture 13: Mount Kosciuszko, Vascular Plant, Northern Hemisphere
5 Sep 2018
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Origins and evolution of the australian flora 1. The australian environment is shaped by its: geographical position, antiquity. Size shape and relief isolation from other large land masses. Historical perspective on origin of the australian flora: early views -australian flora primarily a result of migration from the northern hemisphere, this view based on, euro-centrism, belief that the continental positions were fixed. Lack of glaciers (coupled with comparative flat topography: there were ice caps on mount kosciuszko and in tasmania. Size lack of vascular tissue / no lignin: dependency upon water for reproduction, no true leaves, wind / water dispersal of propagules alternation of generations, lack of true roots possess (cid:858)rhizoids(cid:859) Examples of early vascular plants late silurian ~ 420 ma. Lycophytes: oldest group of vascular plants: reproduced via spores, root systems, true leaves, club mosses & scale trees, mu(cid:272)h (cid:373)ore (cid:858)ad(cid:448)a(cid:374)(cid:272)ed(cid:859) i(cid:374) australia tha(cid:374) (cid:272)o(cid:374)te(cid:373)porar(cid:455) (cid:374)orther(cid:374) he(cid:373)isphere flora.
