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A microsporangium (pl. microsporangia) is a sporangium that produces microspores that give rise to male gametophytes when they germinate. Microsporangia occur in all vascular plants that have heterosporic life cycles, such as seed plants , spike mosses and the aquatic fern genus Azolla .
In biology, the theca of follicle can also refer to the site of androgen production in females. The theca of the spinal cord is called the thecal sac, and intrathecal injections are made there or in the subarachnoid space of the skull.
The microspore has three different types of wall layers. The outer layer is called the perispore, the next is the exospore, and the inner layer is the endospore.The perispore is the thickest of the three layers while the exospore and endospore are relatively equal in width.
This list of botanical gardens and arboretums in California is intended to include all significant botanical gardens and arboretums in the U.S. state of California ...
The coast of California north of San Francisco contains the Northern California coastal forests (as defined by the WWF) and the southern section of the Coast Range ecoregion (as defined by the EPA). This ecoregion is dominated by redwood forest , containing the tallest and some of the oldest trees in the world.
The KXTV/KOVR Tower (also known as the Sacramento Joint Venture Tower) is a 2,049 ft (625 m) communications tower in Walnut Grove, California, United States. Built in 2000, it is the tallest structure in California , second-tallest structure in the United States , third-tallest guyed mast in the world (as of 2001), and the eighth-tallest ...
The road is a popular hike and the flats were a popular campground. The Henninger Flats Forestry Center is also used for conservation education. [9] The toll road was washed out by a landslide in 2005 approximately 200 yards (182.9 m) past the Eaton Canyon bridge, but was re-opened in early September 2009 as the result of fire crews needing vehicular access to the area while fighting the ...
Arroyo Seco is an 11.7-mile-long (18.8 km) [2] watercourse in Alameda County, California, that traverses through the city of Livermore, emptying into Arroyo Las Positas. Arroyo Seco means "dry stream" in Spanish .