Showers and Thunderstorms Across the East; Rain and Mountain Snow out West. A frontal boundary draped from the Mid-Atlantic to Texas will continue to focus showers with the potential for locally heavy precipitation. A new active storm pattern will bring rain with mountain snow to the west. Pacific storms moving into the Central U.S. this week will bring showers and thunderstorms to the northern states. Read More >. Customize Your Weather.gov.
The prothallium produces both male and female sexual organs. When the female organs become fertilized by the male organs, small fern plants begin to grow. In some ferns it can take as long as six months for the first fronds (leaves) to appear after sexual fertilization.
742 Part X Plant Form and Function Nonvascular plants Seedless vascular plants Gymnosperms Angiosperms FIGURE 37.9A tree fern (phylum Pterophyta) in the forests of Malaysia. The ferns are by far the largest group of seedless vascular plants.eedless Vascular Plants The earliest vascular plants lackedseeds. Members of four phyla of livingvascular plants lack seeds, as do at leastthree other phyla known only from fos-sils.