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.
Although most ferns reproduce using spores, one group evolved seeds although they were not ancestral to other seed plants. Fern leaves possess a highly branched vascular system. Some ferns in. have leaves that are 6-9 m long and probably the most complex leaves in the plant kingdom.nlike most algae, land plants have a multicellular jacket for protecting the reproductive cells. BRYOPHYTES: liverworts, hornworts, mosses; 23,000 modern species. Spores of bryophytic plants represent the first known land plants from the Middle Ordovician.