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Plants are placed into two simple kingdom subsections: nonvascular and vascular plants. The big distinction between the two groups is that vascular plants have vascular_tissues: tissues that conduct water and dissolved food in the plant body. The vascular tissues include xylem, which moves water and minerals upward through the plant and phloem, which moves dissolved food downward in the plant.

Nonvascular plants lack these tubes, and therefore must be small and thin so that each cell can acquire its needed materials via passive_transport from the plant's surface, or from other cells within the plant that are located near the surface.

Regardless of whether a plant is vascular or nonvascular, it has structures that (1) anchor it into the soil, (2) provide physical support for its photosynthetic structures, and (3) specialize in performing photosynthesis.

Photo Atlas micrographs 49A and 49B show a real life view of Selaginella (a Spike_moss; Phylum_Lycophyta) and its strobili. Your slide (along with micrograph 49C) is a longitudinal section of a single Selaginella strobilus. Microsporangia are male structures and are supported by microsporophyll_tissue. Megasporangia are female structures and are supported by megasporophyll_tissue.