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The Rise And Development Of The Megagametophyte In Yucca Angustissima Engelmann, Antone W. Nisson
The Rise And Development Of The Megagametophyte In Yucca Angustissima Engelmann, Antone W. Nisson
Theses and Dissertations
The studies involved in this investigation are based upon data and materials secured in the sandy areas of Washington and Iron Counties in southern Utah. The regions in which Yucca angustissima is found have a scant vegetation, are dry, sandy to sandy loam, well-drained, and with an elevation of from 2500 to 5000 feet. Watkins (1937) worked out a very extensive report of the megagametophyte development of Yucca rupicola. He begins with the four megaspore stage, and shows next the disintegration of the three micropylar megaspores. He reported that the chalazal megaspore forms eight free nuclei, by three successive divisions, …
A Preliminary Study Of The Vegetative Cover In Spanish Fork Canyon, Utah, Ben S. Markham
A Preliminary Study Of The Vegetative Cover In Spanish Fork Canyon, Utah, Ben S. Markham
Theses and Dissertations
Spanish Fork Canyon is located in central Utah and is part of the Wasatch Mountain range. Since the coming of the white man to this section of country it has been used as a trail. The canyon provides summer range for stock as well as a watershed. Plant densities were determined by the point observation method using series of one-hundred square foot plots. Three areas which have been subject to different grazing uses were studied. The association changes in the canyon are the replacement of sage by slender wheatgrass on the shallow soils and the disclimax condition resulting from over-grazing …