In January of 2012, both pollen and ovulate strobili
were observed at all stages of maturity, from newly emerging to pollen/seed dehiscence.
The visibility of strobili
developing on plants would allow hunter-gatherers to anticipate the size and location of the next harvest.
Plants terrestrial, on rocks or epiphytic; rhizomes normally present, erect stems simple or branched; leaves appressed to ascending or spreading; sporangia in strobili
Plant moss-like; leaves simple and greatly reduced; blades bearing a single midvein or midveins wanting; sporangia in axils of leaves or in cone-like strobili
were arranged in two vertical rows in the axils of alternating or subopposite bracts.
of numerous ovule-bearing, stalked megasporophylls,
Water, nutrient, and carbohydrate relations in growth of Pinus resinosa ovulate strobili
He emphasized differences between cones and strobili
, rather than their aggregation on the plant.
Within the conifer lineage, ancient forms exhibit vegetative structure fully comparable with living groups but have ovules borne in compound strobili
homologous with those produced by cordaites.
(cones) are located in tight clusters of 10-50, usually on the lower branches of trees.
The microsporangiate strobilus of gymnosperms is simple, but within the Taxaceae and the Cephalotaxaceae there are clear examples of compound pollen strobili
, and those that appear simple are currently interpreted to be reduced compound structures (Keng, 1969; Wilde, 1944, 1975).
And yet, the ideas developed by Croizat (1964) - on strobili
, flowers, and inflorescences in general; on the distinction between carpel and ovary; and on the definition of morphological structures in particular - illustrate that we should not take for granted the foundation of classification systems on a theory of morphology.