International Excursion in America. 
275 
extensive investigation of Californian chaparral may be expected 
to throw much light on all these relations. 
A large area of the Mount Tamalpais chaparral was burned 
over early in July and the vigorous sprouting from the burned 
stumps that had occurred by mid-September showed very well the 
characteristic vegetative rejuvenation of chaparral after burning. 
The canyons on Mount Tamalpais are full of small redwoods 
(Sequoia sewpcrvirens) and Douglas fir. The redwoods as opposed 
to the chaparral are said to be confined to the “fog region” so 
characteristic of the vicinity of San Francisco. The prevalence of 
cold mist over San Francisco city and the shores of the bay is 
indeed a striking characteristic, rather unexpected by the stranger. 
Muir Woods in Mill Valley show a very fine example of primitive 
redwood forest, in which the dominant tree is associated with 
Qnercus densi/lora,Pseudotsuga mucronata, Umbellnlaria and Arbutus, 
with Acer macrophyllum, Rhododendron occidentale, the deciduous 
Corylus rostrata, and the magnificent Aralia californica and Aspidium 
monetum as the great features of the undergrowth. Other abundant 
species are Pteridium aquilinum, Myrica californica, Gaultheria 
Shallon, Vaccinium ovatum , IVoodwardia radicans, Oxalis oregana, 
etc., indicating of course much damper conditions, both atmospheri¬ 
cally and edaphically than are present in typical chaparral. Apart 
from the dominant redwood, the whole facies of this vegetation and 
the leaf-form of many of the prevalent trees and shrubs is that of 
the “laurel type” found in the Atlantic—Mediterranean region and 
in the sheltered ravines of the Mediterranean foothills. In both 
cases the “laurel vegetation” possesses several species in common 
with the chaparral or maquis, the adjacent climatic type. 
On the Yosemite trip and during the whole stay in the San 
Francisco region, the international party were received with true 
Californian hospitality and were guided and generally looked after 
in the most admirable way, the various local institutions—the 
University of the California, and the California Botanical Society— 
vying with one another in their efforts to give the visitors a pleasant 
and profitable trip. A too short visit was made by some of the 
party to Stanford University at Palo Alto, where Professor 
Campbell and Professor Peirce acted as hosts with great charm, and 
the beautiful buildings of the University were much admired. To 
Professors Setchell, Jepson and Hall, and to Miss Alice Eastwood, 
the party were greatly indebted for their kindness during the stay 
as a whole. 
(to be continued). 
