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.
Ferns in the sporophyte stage have spore-bearing fronds called sporophylls that produce clusters of sporangia on their undersides.These contain cells that become spore mother cells, and each of these splits into meiospores. The sporangia erupt when they mature, shooting dust-like spores into the air.erns in the sporophyte stage have spore-bearing fronds called sporophylls that produce clusters of sporangia on their undersides.