. Results of a biological survey of mount Shasta, California. ot found on Shasta except ou the northeast (quadrant, where Ver- OCT., 1899.] PIXE BELT. 30 11011 Bailey, in following the w agou road around the inouiitaiu, passedthrough a belt of it about 8 miles iu length. It begins 3 milesnortheast of Ash Creek at an altitude of about 5,400 feet and reachesnortherly to about 3 miles northwest of Incon stance Creek, whereit ends abruptly at an altitude of 5,000 feet. Here it is the dominanttree, and in half of it the only tree. This area is covered during thelatter part of the aftern
. Results of a biological survey of mount Shasta, California. ot found on Shasta except ou the northeast (quadrant, where Ver- OCT., 1899.] PIXE BELT. 30 11011 Bailey, in following the w agou road around the inouiitaiu, passedthrough a belt of it about 8 miles iu length. It begins 3 milesnortheast of Ash Creek at an altitude of about 5,400 feet and reachesnortherly to about 3 miles northwest of Incon stance Creek, whereit ends abruptly at an altitude of 5,000 feet. Here it is the dominanttree, and in half of it the only tree. This area is covered during thelatter part of the afternoon by the shadow of the mountain, and conse-quently is colder than places of equal altitude farther north or soil is sandy and barren and the trees are of small size. (3) The Upper Belt or Belt of White-Bark Pines {Finns alMcaulis). Still above the forest of Shasta firs, braving its way upward over thebare rocky ridp-^s into the very teeth of the domain of perpetual snow,is another timber belt—an c pen belt of straggling, irregular trees, whose. whitened, twisted trunks with their storm-beaten heads of green areamong the most weirdly picturesque objects on the mountain (fig. 20).The tree is the timberline white-bark pine, which, wherever found,pushes its way over steep and barren slopes to the extreme upper limitof tree growth. At the lower part of its range it forms an almost continuous thoughnarrow belt around the mountain, and often attains a height of 30 or 40feet and a diameter of 2 feet. In the higher parts of its range it soonbecomes restricted to the ridges, leaving the intervening basins andgulches bare, and as it climbs higher and higher becomes more andmore reduced iu size and undergoes material changes of form and posi-tion. At certain altitudes the slanting trunks, only 4 or 5 feet inheight, serve as pillars to support the flattened tops which form acanopy of intertwined and matted branches (lig. 21). 40 NORTH A:\rERI(AN FAUNA. These dwarf groves oiler
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Keywords: ., binomial=pinusalbicaulis, common=whitebarkpin, taxonomy
