118 Forest Club Annual 



ridge is approached. The surface is smooth, rendering logging 

 easy. 



The soil is of a volcanic origin. On the slopes there is 

 a sandy loam derived from the underlying breccias iand the 

 decomposition of andesite, intermixed with humus derived 

 from decaying vegetable mould. It is of fair fertility and 

 where deep enough and where moisture is available, can sup- 

 port an excellent forest growth. 



The ground-cover consists principally of squawmat 

 (Ceanothus prostratus Benth.) and a small sunflower. On 

 the timbered areas little or no grass occurs but in the valleys 

 near streams or springs some gnass is found, either of the 

 wet or dry meadow variety. 



The underbrush in pure Jeffrey Pine is principally Sage 

 Brush (Artemisia rigida Gray). Somewhat higher and con- 

 fined more to the slopes, Manzanita (Arctostaphylos manzanita 

 Parry.) Snow Brush (Caenothus velutinus, Dougl.), Chinqua- 

 pin (Castanopsis chrysophylla (Dougl.) A. DC.) and the Scrub 

 Cherry (Prunus demissa (Nutt.) Walp.) become quite abund- 

 ant, especially >on the north slopes. 



The Jeffery Pine type predominates at this elevation. 

 The more important trees of this type are Jeffery Pine, 

 (Pinus jeffreyi "Oreg. Com.") and White Fir (Abies concolor 

 (Gord.) Parry.) Less important and scattered species are 

 Lodgepole ~Pine(Pinus contorta Loud.), Incense Cedar (Liboced- 

 rus decurrens Torr.), Western Juniper (Juniperus occidenta- 

 lis Hook.), Sugar Pine (Pinus lambertiana Dougl.) and Califor- 

 nia Red Firf Abies magnifica Murr.). The average composition 

 of the Jeffrey Pine type in virgin stands is as follows : 



Jeffery Pine 1 11 % 



White Fir : 21% 



Other species 2 % 



The virgin stands of this type average about 16,000 board 

 feet per acre. The White Fir increases with altitude and 

 soil moisture while the Jeffery Pine drops out and the Red 

 Fir appears, thus becoming the transition between the two 

 types. The density of the stand is determined by soil and 

 moisture conditions where there is a large proportion of Jeffrey 

 Pine while if there is a considerable amount of fir present 



