Vascular Plants Without Seeds (Fern (Sori and sprangia- cluster of…
Vascular Plants Without Seeds
a branching diagram showing the cladistic relationship between a number of species.
Club mosses, quillworts, & spike mosses
Early vascular tissue
Paleobotany: the recovery and identification of plant remains from geological contexts, and their use for the biological reconstruction of past environments, and the evolutionary history of plants, with a bearing upon the evolution of life in general.
dibiontic life cycle
Interpolational hypothesis: small sporophyte came into existencewhen zygote germinated mitotically.
Early Vascular Plants
Rhyniophytes: equal dichotomous branching,
Example Rhynia and Aglaophyton
Zosterophyllophytes: example- Rebuchia, Crenaticaulis
The microphyll Line of Evolution: Lycophytes
Lycophytes have lateral sporangia and exarch prosteles.
true roots evolved,
vascular cambium in many extinct
cones or strobili,
necessary precondition for evolution of seeds, -
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Lycopidium cernuum- extensive rhizomes, vertical chlorophyllous shoots, and sporangia clustered into cones.
Lycopodium obscurum,- sporangia clustered into cones at the tips of branches.
Lycopodium lucidulum- sporangia are distributed among the leaves rather than in strobili.
sole genus of vascular plants in the family Selaginellaceae, the spikemosses or lesser clubmosses.
Lycopodium is a genus of clubmosses, also known as ground pines or creeping cedar, in the family Lycopodiaceae, a family of fern-allies.
Arthrophyta, Pteridophyta & Psilotum
horsetail, whisk fern, fern
Sori and sprangia- cluster of sporangia (structures producing and containing spores) in ferns and fungi
Prothallus: the gametophyte of ferns and other primitive plants.
Conversion of embryophytes because of Meiosis