Biogeography Archives - Michael Kauffmann

March 22, 2025March 22, 2025

A Life Beneath the Canopy

How California’s Trees Shaped a Book, a Friendship, and a Calling

I first fell in love with trees as a high school student in the green underworld of the eastern deciduous forests near Williamsburg, Virginia. My teacher, Charles Dubay, believed we should know our world with both precision and appreciation. In his field biology class he taught us the trees twice—once in the fullness of leaf and light, when the crowns cast shade and shimmered in the wind, and again in the starkness of winter, when the branches and bark told their stories—bare.

I first learned about trees in swamps across the eastern piedmont of Virginia.

October 21, 2021July 3, 2023

Magnificent Five-Needle Pines

of Western North America

I have made more posts about foxtail pines than any other trees and it is thus no secret that my favorite conifer is a five-needle pine. There are a lot of thoughts and details about five-needle pines swirling around in my world these days–for better or worse (fires and climate change)–so I figure I’ll add to the story with some updates here.

October 13, 2019October 15, 2019

Pacific Silver Fir in California

Part 2: Marble Mountain Wilderness

Read Part 1

In conjunction with the Klamath National Forest and the California Native Plant Society Vegetation Team, I completed a mapping and inventory project for Pacific silver fir (Abies amabilis) in California. The first part of this project was along the Siskiyou Crest, near the Oregon-California border. This post is about the populations in the Marble Mountain Wilderness.

In 2016 I embarked on a mapping and inventory project for yellow-cedar (Callitropsis nootkatensis) in California. At the time, I called yellow-cedar California’s rarest conifer. In 2019, new discoveries on the north slopes of Copper Butte and Preston Peak brought the total hectares of yellow-cedar in California to ~21 hectares. With this new data, and that collected in this project, we now know Abies amabilis is California’s rarest conifer*! See table below for stand data summary.

*This excludes the neoendemic California cypresses.

August 12, 2019August 15, 2019

My other side of the Mountain

Exploring upper Copper and Indian creeks for yellow-cedar

I have been mapping and inventorying yellow-cedar (Callitropsis nootkatensis) in California for the past four years. This process could have been much more efficient if it wasn’t for the 2018 Eclipse Complex and the 2019 Natchez Fire (more below) that virtually closed the Siskiyou Wilderness for the past two summers.

Successful surveys before this year have doubled the previously known area of this rare conifer from approximately 5 hectares in 2015 to 11 hectares by 2018. One of the largest gaps in surveys was within upper Indian and Copper creeks in the Klamath River watershed. I predicted this is where the largest stands of the species would be–little did I know how large an area I would find.

El Capitan (6670′) looms above Copper Creek.

July 16, 2019October 14, 2019

Pacific Silver Fir in California

Part 1: The Siskiyou Crest

Read Part 2

Pacific silver fir range map from Conifers of the Pacific Slope.

In conjunction with the Klamath National Forest and the California Native Plant Society Vegetation Team, I began a mapping and inventory project for Pacific silver fir (Abies amabilis) in California. The first part of this project was along the Siskiyou Crest, near the Oregon-California border. Later this summer I will visit the other population in the Marble Mountain Wilderness.

Pacific silver fir in California can easily be overlooked because of its similarity to white fir (Abies concolor). Upon close inspection (and by going to specific locations) the differences will become apparent. Silver fir is identifiable in the hand because it has the most distinct and exuberant stomatal bloom of any regional tree. Like grand fir (and regionally white fir) the tips of the needles are notched. The needles splay from the branch on only one side often in a perfect arrays, fanning out in a semi-circular manner. The needles occasionally twist in this array, thus offering distinct silver flashes of the stomatal bloom on the undersides—a brilliant contrast to the dark-green upper surfaces. This is also what sets it apart from white fir, with a duller stomatal bloom. As with other Abies, the smell of crushed needles emits a resinous “pine scent.” The bark is distinct, forming long, narrow, rectangular blocking patterns that seem to melt off the trunks in silvery chunks with subtle reddish hues in the furrows. At a distance, larger trees are gradually tapered, similar to Shasta fir (Abies magnifica var. shastensis). It is an inimitable and rare experience to spend time with this beauty in the Klamath Mountains