. Results of a biological survey of Mount Shasta, California. Natural history; Natural history. 42 NOETH AMERICAN FAUNA. [xu. 16. on a barren pumice slope to 7,000 feet, where, sparingly mixed with alpine hemlocks, they meet the upper limit of Shasta flrs and silver jjines. Black Alpine Hemlock {Tmiga mcrtemidiKi.^).âBut thi' white- bark pine, although the dominant and most widely distributed tree of the upper timber belt, is not the only tree, for in places it is mixed with or replaced by the black alpine liendock. Shasta is a very dry mountain, and yet the white-bark x'ine thrives on its dri
. Results of a biological survey of Mount Shasta, California. Natural history; Natural history. 42 NOETH AMERICAN FAUNA. [xu. 16. on a barren pumice slope to 7,000 feet, where, sparingly mixed with alpine hemlocks, they meet the upper limit of Shasta flrs and silver jjines. Black Alpine Hemlock {Tmiga mcrtemidiKi.^).âBut thi' white- bark pine, although the dominant and most widely distributed tree of the upper timber belt, is not the only tree, for in places it is mixed with or replaced by the black alpine liendock. Shasta is a very dry mountain, and yet the white-bark x'ine thrives on its driest slopes and grows among the bare, naked blocks of lava where tree life seems impossible. The hemlock requires more moisture, and therefore is at a decided disadvantage. It never reaches as high as Pinna alhlaailis and attains its best development along the lower border of the Hud- â ^'^' t '^ ^ .^>*" *'â *:'.. Tig. 24 âlUai'k alpine hemlocks near Squaw Creek. sonian zone, where it occurs in disconnected sheltered localitiesâ usually in canyons or on the shady east or northeast sides of buttes or ridges, where there is more moisture than on the exposed slopes. Since these shady easterly slopes arc always cold, the hemlocks that occupy 'This in the .species heretofore eoinmonly ^^novfll as Tsiiga j)attoni or Tainiii patto- niana. It has liceii recently discovereil tliat the Tsuga meriensiana, commonly applied to the racirn-, lowland hemlock, was iirst yiveu to the jircseut alpiue species, uecessitatiny a most imliappy cliange of name. Fortnnately, however, the common Knglish names of the two and their widely different zone rangesâone restricted to the low Transition belt near tlu^ coast, the other to the hif;h Hudsonian zone on the loftiest monntainsâmay prevent the confusion that otherwise would result from the chance of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colo
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