Heavy summer fogs frequently cover the western ocean-facing slopes and valleys, resulting in drizzle and fog drip caused by condensation on the redwoods, pines, and other trees, which sustains the moisture-loving redwood forests.
22.
In summer, the area gets almost no precipitation, except for fog drip that occurs in Muir Woods, the Bolinas Ridge and the western end of Mount Tamalpais, where summer fog and oceanic breezes are more prevalent.
23.
The Douglas fir produced 7-17 inches of fog drip and appeared to provide unique conditions supporting the orchids phantom orchid ( " Cephalanthera austiniae " ), since these plants were found exclusively in these moist ridge tops.
24.
Although rainfall is rare during the summer months, fog often comes up the river from the Pacific Ocean, producing enough condensation to create " fog drip, " which sustains the numerous redwood trees, ferns, and other vegetation.
25.
The Douglas fir produced 7-17 inches of fog drip and appeared to provide unique conditions supporting the orchids Phantom orchid ( " Cephalanthera austiniae " ), since these plants were found exclusively in these moist ridge tops.
26.
Dr . Reed Noss, co-director of the Conservation Biology Institute and editor of the upcoming volume on redwoods, said that understanding the relationship between fog drip and the stupendous height of redwoods was more than a mere curiosity.
27.
"When you clear cut, you don't have any input from the fog, " said Els Cooperrider, a redwood conservationist and local radio talk-show host, who said she has made " fog drip " a household word in Mendocino County.
28.
He found that the trees most exposed produced the most precipitation and in five weeks of measurement ( July 20-August 28, 1951 ) fog drip below the tanoak produced 59 inches of precipitation, more than the total annual precipitation on nearby grasslands and chaparral.
29.
On Cahill Ridge, just west of San Mateo Creek and east of Pilarcitos Creek, at an altitude of 1, 000 feet, Oberlander measured fog drip beneath tanoak ( " Lithocarpus densiflorus " ), coast redwood and three Douglas fir trees, the latter 125 feet tall.
30.
On Cahill Ridge ( just west of San Mateo Creek and east of Pilarcitos Creek, at an altitude of 1, 000 feet, Oberlander measured fog drip beneath Tanoak ( " Lithocarpus densiflorus " ), Coast redwood and three Douglas fir trees, the latter 125 feet tall.
