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Arctic bark botanists branches bristlecone pine broadleaf California called cambium carbon dioxide cells Central America chromosomes climate coast conifers cross develop Digger pine eastern white pine ecological environment Europe feet female conelet fire Forest Genetics Forest Service Photo forest tree fragrance fungi germination glaciation groves growth hard pines hybrid islands Italian stone pine jack pine Jeffrey pine Khasi known Krempf living loblolly lodgepole pine lowlands mature Mediterranean Merkus pine Mexico Monterey pine mountains mycorrhiza N. T. Mirov nitrogen northern hemisphere phloem photosynthesis pine cone pine forests pine needle pine Pinus pine seeds pine species pine tree pines grow pinyon pines Pirms planted pollen grains ponderosa pine region resin canals respiration roots sapwood Scots pine seedlings Siberia Sierra Nevada soil southeastern southern stomata sugar pine summer Tertiary tree breeders tropical trunk turpentine U.S. Forest Service western U.S. wild winter wood xylem